601
FXUS65 KBYZ 290806
AFDBYZ

Area Forecast Discussion
National Weather Service Billings MT
206 AM MDT Sun Jun 29 2025

.KEY MESSAGES...

- Mostly dry conditions expected Today and Monday.

- Turning warm this week with many locations in the 90s by
  Tuesday and Wednesday.

- Chance of thunderstorms begins to increase again by the middle
  of next week.

&&

.DISCUSSION...

Today through Monday Night...

Isolated showers or sprinkles may linger across north central
wyoming and into the southeast corner of Montana through the mid
morning hours today. Isolated shower/thunder may also pop up over
the Big Honrs in the afternoon. Otherwise, dry conditions will
prevail today as much drier air moves into our region in the W/NW
mid level flow. Upper ridging then takes over for tonight into
Monday with warmer and dry conditions across the CWA Monday.

Temperatures today will be seasonally very pleasant with upper
70s to lower 80s expected. Overnight lows will be in the upper
40s to lower 50s for most locations. Readings jump up lower to
upper 80s over the region Monday as the upper ridge dominates.
BT

Tuesday through Saturday...

There is good confidence and agreement amongst the models, and
their ensembles, that a potent ridge will build in across the
region. High temperatures are forecast to reach into the 90s
Tuesday through Thursday across much of the region. Overnight lows
are forecast to be near average, with temperatures in the 50s and
60s. Along with above average temperatures, a surge of monsoonal
moisture is forecast to move into the region beginning Tuesday.
The current forecast has dewpoints in the 50s the midweek,
however, with models indicating PWATs 100 to 140% of normal; it is
possible dewpoints climb into the low 60s.

There is a near daily chance (20-50%) for showers and
thunderstorms beginning Tuesday afternoon. It is too soon to
determine the strength and coverage of storms however. Continue to
monitor the forecast if you have outdoor plans.

Late next week, there are hints at the ridge breaking down with a
weak Pacific trough. This could bring a brief reprieve from the
heat and stormy conditions.

Matos/WMR

&&

.AVIATION...

VFR conditions will prevail region-wide throughout the period
with winds staying below 20kts. A stray shower or thunderstorm is
possible in far southeast Montana or Northern Wyoming during the
day (20% chance).  WMR

&&

.PRELIMINARY POINT TEMP/POPS...

    Tdy Mon     Tue     Wed     Thu     Fri     Sat
-------------------------------------------------------
BIL 080 055/086 059/093 063/094 064/090 062/086 060/084
    0/U 00/U    00/U    11/B    22/T    43/T    33/T
LVM 079 046/084 052/092 056/090 057/086 054/084 053/082
    0/U 00/U    01/U    12/T    34/T    44/T    34/T
HDN 081 052/087 057/095 060/097 063/091 061/086 059/085
    0/U 00/U    00/U    11/B    32/T    43/T    33/T
MLS 082 054/086 058/096 065/097 068/095 066/089 061/086
    0/B 00/U    00/U    11/U    21/B    42/T    22/T
4BQ 079 055/083 058/093 064/095 067/092 065/086 061/084
    1/B 00/U    00/U    10/U    21/B    42/T    32/T
BHK 079 050/082 054/090 059/093 063/092 061/086 058/083
    0/U 00/U    00/U    10/U    21/B    42/T    22/T
SHR 077 049/084 054/092 058/092 059/087 057/083 054/082
    2/T 00/U    01/U    11/B    23/T    44/T    33/T

&&

.BYZ WATCHES/WARNINGS/ADVISORIES...
MT...None.
WY...None.

&&

$$
weather.gov/billings