311
FZHW50 PHFO 181302
CWFHFO

Coastal Waters Forecast
National Weather Service Honolulu HI
302 AM HST Tue Aug 18 2026

Hawaiian coastal waters within 40 nautical miles including the
Hawaiian Islands Humpback Whale National Marine Sanctuary.

PHZ100-190145-
302 AM HST Tue Aug 18 2026

.Synopsis for Hawaiian coastal waters...
High pressure far northeast of the waters will remain nearly
stationary and slowly weaken through Thursday. By Friday, the high
will drift southeast as moderate to locally fresh trade winds
will likely build back in.

$$

PHZ110-190145-
Kauai Northwest Waters-
302 AM HST Tue Aug 18 2026

.TODAY...East winds 15 to 20 knots. Seas 5 to 6 feet. Isolated
showers this afternoon.
.TONIGHT...East winds 15 to 20 knots. Seas 4 to 5 feet. Scattered
showers.
.WEDNESDAY...East winds 15 to 20 knots. Seas 4 to 5 feet.
Isolated showers in the morning, then scattered showers in the
afternoon.
.WEDNESDAY NIGHT...East winds to 15 knots. Seas 4 to 5 feet.
Scattered showers.
.THURSDAY...East northeast winds 10 to 15 knots. Seas 3 to
4 feet. Scattered showers.
.THURSDAY NIGHT...East northeast winds 10 to 15 knots. Seas 3 to
4 feet. Scattered showers in the evening, then showers likely
after midnight.
.FRIDAY...Winds variable less than 10 knots, becoming east 7 to
10 knots. Seas to 3 feet. Wave Detail: East 3 feet at 6 seconds.
Scattered showers.
.SATURDAY...East winds 10 to 15 knots, rising to 15 to 20 knots.
Seas 3 to 5 feet. Wave Detail: East 5 feet at 7 seconds. Isolated
showers in the morning. Isolated showers after midnight.

$$

PHZ111-190145-
Kauai Windward Waters-
302 AM HST Tue Aug 18 2026

.TODAY...East winds to 15 knots. Seas 5 to 6 feet. Wave Detail:
South 3 feet at 13 seconds. Isolated showers this afternoon.
.TONIGHT...East winds to 15 knots. Seas to 5 feet. Scattered
showers.
.WEDNESDAY...East winds 10 to 15 knots. Seas to 5 feet. Scattered
showers.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 4 to 5 feet.
Scattered showers.
.THURSDAY...East northeast winds to 10 knots. Seas 3 to 4 feet.
Scattered showers.
.THURSDAY NIGHT...East northeast winds 7 to 10 knots. Seas to
3 feet. Scattered showers in the evening, then showers likely
after midnight.
.FRIDAY...Winds variable less than 10 knots, becoming east to
10 knots. Seas 3 to 4 feet. Wave Detail: East 4 feet at
7 seconds. Scattered showers.
.SATURDAY...East winds to 15 knots. Seas 4 to 6 feet. Wave
Detail: East 5 feet at 7 seconds. Isolated showers in the
morning. Isolated showers after midnight.

$$

PHZ112-190145-
Kauai Leeward Waters-
302 AM HST Tue Aug 18 2026

.TODAY...East winds 15 to 20 knots. Seas 4 to 6 feet. Wave
Detail: South 3 feet at 13 seconds. Isolated showers.
.TONIGHT...East winds 15 to 20 knots. Seas 3 to 5 feet. Scattered
showers, mainly in the evening.
.WEDNESDAY...East winds 15 to 20 knots. Seas 3 to 5 feet.
Isolated showers.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet.
Isolated showers in the evening, then scattered showers after
midnight.
.THURSDAY...East northeast winds 10 to 15 knots. Seas 3 to
4 feet. Scattered showers.
.THURSDAY NIGHT...Winds east northeast winds 7 to 10 knots. Seas
to 3 feet. Scattered showers.
.FRIDAY...East winds 7 to 10 knots in the morning, becoming
variable less than 10 knots, then becoming east 7 to 10 knots. In
the Kaulakahi Channel, east winds 7 to 10 knots, becoming
variable less than 10 knots. Seas to 3 feet. Wave Detail: East
3 feet at 5 seconds. Scattered showers.
.SATURDAY...East northeast winds 10 to 15 knots, rising to 15 to
20 knots. Seas 3 to 5 feet. Wave Detail: East 4 feet at
6 seconds.

$$

PHZ113-190145-
Kauai Channel-
302 AM HST Tue Aug 18 2026

.TODAY...East northeast winds 15 to 20 knots. Seas 4 to 6 feet.
Wave Detail: South 3 feet at 13 seconds. Isolated showers this
afternoon.
.TONIGHT...East northeast winds 15 to 20 knots. Seas 4 to 5 feet.
Scattered showers, mainly in the evening.
.WEDNESDAY...East northeast winds 10 to 15 knots. Seas 3 to
5 feet. Isolated showers.
.WEDNESDAY NIGHT...East northeast winds to 15 knots. Seas 3 to
4 feet. Isolated showers in the evening, then scattered showers
after midnight.
.THURSDAY...East northeast winds 10 to 15 knots. Seas 3 to
4 feet. Scattered showers.
.THURSDAY NIGHT...East northeast winds to 10 knots. Seas to
3 feet. Scattered showers.
.FRIDAY...Winds variable less than 10 knots, becoming east
northeast 10 to 15 knots. Seas 3 to 4 feet. Wave Detail: East
3 feet at 6 seconds. Scattered showers.
.SATURDAY...East northeast winds 10 to 15 knots, rising to 15 to
20 knots. Seas 3 to 5 feet. Wave Detail: East 4 feet at
6 seconds.

$$

PHZ114-190145-
Oahu Windward Waters-
302 AM HST Tue Aug 18 2026

.TODAY...East winds 15 to 20 knots. Seas to 5 feet. Isolated
showers.
.TONIGHT...East winds 15 to 20 knots. Seas to 5 feet. Scattered
showers.
.WEDNESDAY...East winds 10 to 15 knots. Seas 4 to 5 feet.
Scattered showers.
.WEDNESDAY NIGHT...East northeast winds 10 to 15 knots. Seas 4 to
5 feet. Scattered showers.
.THURSDAY...East northeast winds to 10 knots. Seas 3 to 4 feet.
Scattered showers.
.THURSDAY NIGHT...East northeast winds 7 to 10 knots. Seas to
3 feet. Scattered showers in the evening, then showers likely
after midnight.
.FRIDAY...Winds variable less than 10 knots, becoming east 10 to
15 knots. Seas 3 to 4 feet. Wave Detail: East southeast 4 feet at
6 seconds. Scattered showers.
.SATURDAY...East winds 15 to 20 knots. Seas 4 to 6 feet. Wave
Detail: East southeast 5 feet at 7 seconds. Isolated showers
after midnight.

$$

PHZ115-190145-
Oahu Leeward Waters-
302 AM HST Tue Aug 18 2026

.TODAY...East northeast winds 15 to 20 knots. Seas 4 to 6 feet.
Wave Detail: South 3 feet at 13 seconds. Isolated showers.
.TONIGHT...East northeast winds 15 to 20 knots. Seas to 4 feet.
Scattered showers, mainly in the evening.
.WEDNESDAY...East northeast winds 10 to 15 knots. Seas 3 to
4 feet. Isolated showers.
.WEDNESDAY NIGHT...East northeast winds 10 to 15 knots. Seas to
3 feet. Isolated showers in the evening, then scattered showers
after midnight.
.THURSDAY...Northeast winds 10 to 15 knots, becoming 7 to
10 knots in the afternoon. Seas to 3 feet. Scattered showers.
.THURSDAY NIGHT...East northeast winds 7 to 10 knots. Seas to
2 feet or less. Scattered showers.
.FRIDAY...East winds 7 to 10 knots in the morning, becoming
variable less than 10 knots, then becoming east northeast 7 to
10 knots. Seas to 3 feet. Scattered showers.
.SATURDAY...East winds 10 to 15 knots, becoming east northeast
15 to 20 knots. Seas 3 to 5 feet. Wave Detail: East 4 feet at
6 seconds.

$$

PHZ116-190145-
Kaiwi Channel-
302 AM HST Tue Aug 18 2026

.TODAY...East northeast winds 15 to 20 knots. Seas 4 to 6 feet.
Wave Detail: South 3 feet at 13 seconds. Isolated showers this
afternoon.
.TONIGHT...East northeast winds 15 to 20 knots. Seas 3 to 5 feet.
Isolated showers.
.WEDNESDAY...East northeast winds 10 to 15 knots. Seas 3 to
5 feet. Isolated showers.
.WEDNESDAY NIGHT...East northeast winds to 15 knots. Seas 3 to
4 feet. Isolated showers in the evening, then scattered showers
after midnight.
.THURSDAY...Northeast winds 10 to 15 knots. Seas 3 to 4 feet.
Scattered showers.
.THURSDAY NIGHT...Northeast winds 10 to 15 knots, veering to east
northeast 7 to 10 knots after midnight. Seas to 2 feet or less,
then to 3 feet after midnight. Scattered showers.
.FRIDAY...East northeast winds 7 to 10 knots, becoming 10 to
15 knots. Seas 3 to 4 feet. Wave Detail: East 4 feet at
6 seconds. Scattered showers.
.SATURDAY...East northeast winds to 15 knots, rising to 20 knots.
Seas 4 to 6 feet. Wave Detail: East 5 feet at 6 seconds.

$$

PHZ117-190145-
Maui County Windward Waters-
302 AM HST Tue Aug 18 2026

.TODAY...East winds 15 to 20 knots. Seas 4 to 5 feet. Isolated
showers.
.TONIGHT...East winds 15 to 20 knots. Seas 4 to 5 feet. Scattered
showers.
.WEDNESDAY...East winds 10 to 15 knots. Seas to 4 feet. Scattered
showers.
.WEDNESDAY NIGHT...East northeast winds 10 to 15 knots. Seas 3 to
4 feet. Scattered showers.
.THURSDAY...East northeast winds 10 to 15 knots, backing to
northeast 7 to 10 knots in the afternoon. Seas 3 to 4 feet.
Scattered showers.
.THURSDAY NIGHT...East winds 7 to 10 knots. Seas to 2 feet or
less, then to 3 feet after midnight. Scattered showers in the
evening, then showers likely after midnight.
.FRIDAY...East southeast winds 10 to 15 knots. Seas 3 to 4 feet.
Wave Detail: East southeast 4 feet at 6 seconds. Scattered
showers.
.SATURDAY...East winds to 15 knots, becoming 15 to 20 knots. Seas
5 to 7 feet. Wave Detail: East southeast 6 feet at 7 seconds.
Isolated showers in the morning. Isolated showers through the
day.

$$

PHZ118-190145-
Maui County Leeward Waters-
302 AM HST Tue Aug 18 2026

.TODAY...East winds 15 to 20 knots. Seas 4 to 6 feet. Wave
Detail: South 3 feet at 13 seconds. Isolated showers this
afternoon.
.TONIGHT...East northeast winds 15 to 20 knots. Seas 3 to 5 feet.
Isolated showers.
.WEDNESDAY...East northeast winds 10 to 15 knots. Seas to 3 feet.
Isolated showers.
.WEDNESDAY NIGHT...Northeast winds 7 to 10 knots. Seas to 3 feet.
Isolated showers.
.THURSDAY...North northeast winds 7 to 10 knots. Seas to 2 feet
or less. Isolated showers.
.THURSDAY NIGHT...Northeast winds 7 to 10 knots in the evening,
becoming variable less than 10 knots. Seas to 2 feet or less.
Scattered showers.
.FRIDAY...Winds variable less than 10 knots, becoming east 10 to
15 knots. Seas 3 to 4 feet. Scattered showers in the morning,
then isolated showers through the night. Scattered showers after
midnight.
.SATURDAY...North northeast winds 7 to 10 knots, veering to east
northeast 10 to 15 knots. Seas 3 to 5 feet. Wave Detail: East
southeast 3 feet at 6 seconds.

$$

PHZ119-190145-
Maalaea Bay-
302 AM HST Tue Aug 18 2026

.TODAY...North winds to 20 knots. Seas to 2 feet or less.
.TONIGHT...North winds to 20 knots. Seas to 2 feet or less.
Isolated showers in the evening.
.WEDNESDAY...North winds 15 to 20 knots. Seas to 2 feet or less.
Isolated showers in the afternoon.
.WEDNESDAY NIGHT...North winds to 20 knots, easing to 15 knots
after midnight. Seas to 2 feet or less. Isolated showers after
midnight.
.THURSDAY...North winds to 15 knots. Seas to 2 feet or less.
Isolated showers in the morning, then scattered showers in the
afternoon.
.THURSDAY NIGHT...North winds to 15 knots in the evening,
becoming variable less than 10 knots. Seas to 2 feet or less.
Isolated showers in the evening, then scattered showers after
midnight.
.FRIDAY...Winds variable less than 10 knots, becoming north to
20 knots. Seas to 2 feet or less. Scattered showers through the
night. Isolated showers through the day.
.SATURDAY...North winds to 20 knots, rising to 25 knots. Seas to
2 feet or less.

$$

PHZ120-190145-
Pailolo Channel-
302 AM HST Tue Aug 18 2026

.TODAY...East northeast winds to 20 knots. Seas to 4 feet.
Isolated showers this afternoon.
.TONIGHT...East northeast winds 15 to 20 knots. Seas 3 to 4 feet.
Isolated showers.
.WEDNESDAY...East northeast winds 15 to 20 knots. Seas 3 to
4 feet. Scattered showers, mainly in the morning.
.WEDNESDAY NIGHT...East northeast winds 15 to 20 knots, easing to
10 to 15 knots after midnight. Seas to 3 feet. Scattered showers,
mainly in the evening.
.THURSDAY...East northeast winds 10 to 15 knots. Seas to 3 feet.
Scattered showers.
.THURSDAY NIGHT...East northeast winds 10 to 15 knots in the
evening, becoming variable less than 10 knots. Seas to 2 feet or
less. Scattered showers.
.FRIDAY...Winds variable less than 10 knots, becoming east 15 to
20 knots. Seas to 3 feet. Scattered showers.
.SATURDAY...East northeast winds 15 to 20 knots, rising to 20 to
25 knots. Seas 3 to 4 feet. Wave Detail: East 3 feet at
4 seconds.

$$

PHZ121-190145-
Alenuihaha Channel-
302 AM HST Tue Aug 18 2026

.TODAY...East northeast winds to 20 knots. Seas 5 to 7 feet. Wave
Detail: South 3 feet at 13 seconds. Isolated showers this
afternoon.
.TONIGHT...East northeast winds 15 to 20 knots. Seas 4 to 6 feet.
Scattered showers, mainly in the evening.
.WEDNESDAY...East northeast winds 15 to 20 knots. Seas 3 to
4 feet. Isolated showers.
.WEDNESDAY NIGHT...East northeast winds 15 to 20 knots. Seas 3 to
4 feet. Isolated showers.
.THURSDAY...Northeast winds 15 to 20 knots, easing to 10 to
15 knots in the afternoon. Seas to 3 feet. Isolated showers.
.THURSDAY NIGHT...Northeast winds 10 to 15 knots, veering to east
northeast 7 to 10 knots after midnight. Seas to 3 feet. Scattered
showers.
.FRIDAY...East northeast winds 7 to 10 knots, rising to 15 to
20 knots. Seas 3 to 4 feet. Wave Detail: East 4 feet at
5 seconds. Scattered showers in the morning, then isolated
showers through the night. Scattered showers after midnight.
.SATURDAY...East northeast winds 15 to 20 knots, rising to 20 to
25 knots. Seas 4 to 6 feet. Wave Detail: East 5 feet at
6 seconds. Isolated showers after midnight.

$$

PHZ122-190145-
Big Island Windward Waters-
302 AM HST Tue Aug 18 2026

.TODAY...East northeast winds 10 to 15 knots, rising to 15 to
20 knots this afternoon. Seas 4 to 5 feet. Wave Detail: South
3 feet at 13 seconds. Isolated showers.
.TONIGHT...East northeast winds 15 to 20 knots, easing to 10 to
15 knots after midnight. Seas 3 to 4 feet. Scattered showers.
.WEDNESDAY...East northeast winds 10 to 15 knots. Seas 3 to
4 feet. Scattered showers.
.WEDNESDAY NIGHT...Northeast winds 10 to 15 knots. Seas to
3 feet. Scattered showers.
.THURSDAY...Northeast winds 10 to 15 knots, veering to east
northeast 7 to 10 knots in the afternoon. Seas to 3 feet.
Scattered showers.
.THURSDAY NIGHT...East southeast winds 7 to 10 knots. Seas to
3 feet. Scattered showers in the evening, then showers likely
after midnight.
.FRIDAY...East winds 10 to 15 knots. Seas 3 to 4 feet. Wave
Detail: East southeast 4 feet at 5 seconds. Scattered showers.
.SATURDAY...East northeast winds 15 to 20 knots. Seas 5 to
8 feet. Wave Detail: East southeast 5 feet at 7 seconds. Isolated
showers. Scattered showers after midnight.

$$

PHZ123-190145-
Big Island Leeward Waters-
302 AM HST Tue Aug 18 2026

.TODAY...West of the Big Island, northwest winds 7 to 10 knots
this morning, becoming variable less than 10 knots. Near South
Point, east winds 15 to 20 knots. Seas 5 to 7 feet. Wave Detail:
South 3 feet at 13 seconds. Scattered showers, mainly this
morning.
.TONIGHT...West of the Big Island, west southwest winds 7 to
10 knots in the evening, becoming variable less than 10 knots.
Near South Point, east winds 15 to 20 knots. Seas 4 to 6 feet,
subsiding to 3 to 4 feet after midnight. Wave Detail: South
3 feet at 12 seconds. Scattered showers, mainly in the evening.
.WEDNESDAY...West of the Big Island, north northwest winds 7 to
10 knots in the morning, becoming variable less than 10 knots.
Near South Point, east winds 10 to 15 knots. Seas 3 to 4 feet.
Isolated showers.
.WEDNESDAY NIGHT...West of the Big Island, winds variable less
than 10 knots. Near South Point, east winds 7 to 10 knots,
backing to east northeast after midnight. Seas to 3 feet.
Isolated showers.
.THURSDAY...Winds variable less than 10 knots west of the Big
Island...Northeast 10 to 15 knots near Kawaihae. Seas to 3 feet
in the morning, then to 2 feet or less. Isolated showers.
.THURSDAY NIGHT...Winds variable less than 10 knots west of the
Big Island...East 10 to 15 knots near South Point. Seas to 2 feet
or less, then 3 to 4 feet after midnight. Scattered showers.
.FRIDAY...West of the Big Island, winds variable less than
10 knots. Near South Point, east winds 10 to 15 knots, becoming
east northeast 15 to 20 knots after midnight. Seas 3 to 4 feet.
Wave Detail: East 3 feet at 4 seconds. Scattered showers through
the night, then isolated showers in the evening. Scattered
showers after midnight.
.SATURDAY...West of the Big Island, winds variable less than
10 knots. Near South Point, east northeast winds 10 to 15 knots,
rising to 15 to 20 knots in the afternoon and evening, then
becoming northeast 10 to 15 knots after midnight. Seas 4 to
6 feet. Wave Detail: East northeast 4 feet at 5 seconds. Isolated
showers after midnight.

$$

PHZ124-190145-
Big Island Southeast Waters-
302 AM HST Tue Aug 18 2026

.TODAY...East northeast winds 15 to 20 knots. Seas 4 to 6 feet.
Wave Detail: South 3 feet at 13 seconds. Isolated showers.
.TONIGHT...East northeast winds 15 to 20 knots. Seas to 4 feet.
Scattered showers, mainly in the evening.
.WEDNESDAY...East northeast winds 10 to 15 knots. Seas 3 to
4 feet. Isolated showers in the morning, then scattered showers
in the afternoon.
.WEDNESDAY NIGHT...East northeast winds to 15 knots. Seas to
3 feet. Scattered showers.
.THURSDAY...Northeast winds to 15 knots, becoming east northeast
in the afternoon. Seas to 3 feet. Scattered showers.
.THURSDAY NIGHT...East northeast winds 10 to 15 knots. Seas 3 to
4 feet. Scattered showers in the evening, then showers likely
after midnight.
.FRIDAY...East northeast winds 15 to 20 knots. Seas 4 to 5 feet.
Wave Detail: East southeast 5 feet at 6 seconds. Scattered
showers.
.SATURDAY...East northeast winds 20 to 25 knots. Seas 5 to
8 feet. Wave Detail: East southeast 7 feet at 10 seconds.
Isolated showers.

$$