National Weather Service

News Headlines

Hazardous Weather Conditions

Current conditions at

Mason City Municipal Airport (KMCW)

Lat: 43.15°NLon: 93.33°WElev: 1188ft.

Mostly Cloudy

87°F

31°C

Humidity	65%
Wind Speed	SW 15 mph
Barometer	29.82 in (1008.1 mb)
Dewpoint	74°F (23°C)
Visibility	10.00 mi
Heat Index	95°F (35°C)
Last update	30 Jun 1:53 pm CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

6 Miles SE Grafton IA

Extreme Heat Warning June 30, 02:34pm until July 1, 07:00pm

Click here for hazard details and duration

Extreme Heat Warning

Extreme Heat Warning June 30, 02:34pm until July 1, 07:00pm
NOW until 7:00pm Wed
Extreme Heat Warning
This Afternoon
High: 93 °F
Partly Sunny
and Breezy
Tonight
Low: 72 °F
Mostly Cloudy
then Showers
Likely
Wednesday
High: 90 °F
Showers
Likely then
Slight Chance
T-storms and
Breezy
Wednesday Night
Low: 70 °F
Showers
Thursday
High: 88 °F
Chance
T-storms
Thursday Night
Low: 70 °F
T-storms
Likely then
Showers
Friday
High: 89 °F
Chance
T-storms
Friday Night
Low: 69 °F
T-storms
Likely

Detailed Forecast

This Afternoon

Partly sunny, with a high near 93. Heat index values as high as 101. Breezy, with a southwest wind around 16 mph, with gusts as high as 24 mph.

Tonight

A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 72. South wind 8 to 10 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Wednesday

Showers and thunderstorms likely before 1pm, then a slight chance of showers and thunderstorms after 5pm. Mostly cloudy, then gradually becoming sunny, with a high near 90. Heat index values as high as 96. Breezy, with a south wind 10 to 20 mph, with gusts as high as 28 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Wednesday Night

Showers and thunderstorms before 2am, then showers likely and possibly a thunderstorm between 2am and 3am, then a chance of showers and thunderstorms after 3am. Low around 70. Southwest wind 10 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday

A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 88. South wind 7 to 9 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Thursday Night

Showers and thunderstorms likely, then showers and possibly a thunderstorm after 10pm. Low around 70. South wind 7 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

Friday

A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89. South wind 11 to 13 mph.

Friday Night

Showers and thunderstorms likely, mainly after 1am. Partly cloudy, with a low around 69. South wind 7 to 9 mph becoming west in the evening. Chance of precipitation is 60%.

Independence Day

A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 83. Southeast wind 8 to 10 mph.

Saturday Night

A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66. East wind 6 to 9 mph becoming south after midnight.

Sunday

A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 83. Northeast wind around 7 mph.

Sunday Night

A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65. Northeast wind around 6 mph becoming calm in the evening.

Monday

Mostly sunny, with a high near 84. East wind 3 to 6 mph.