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Changes to River Forecast Services at Multiple Locations in Central Iowa, effective 6/22/2026

Hazardous Weather Conditions

Current conditions at

Storm Lake (KSLB)

Lat: 42.6° N Lon: 95.23° W Elev: 1489 ft.

Overcast

75°F

24°C

Humidity	74%
Wind Speed	SE 20 mph
Barometer	29.84 in
Dewpoint	66°F (19°C)
Visibility	10.00 mi
Last update	27 Jun 4:15 pm CDT

More Information:

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

Detailed forecast for

Sac County

This Afternoon

Partly sunny. Highs in the lower 80s. Southeast winds 15 to 20 mph.

Tonight

Mostly cloudy. A slight chance of showers and thunderstorms after midnight. Humid with lows in the upper 60s. Southeast winds 15 to 20 mph with gusts up to 30 mph. Chance of rain 20 percent.

Sunday

Mostly cloudy with a slight chance of showers and thunderstorms in the morning, then mostly sunny in the afternoon. Breezy, warmer with highs in the mid 90s. Southeast winds 20 to 25 mph. Chance of rain 20 percent. Heat index values up to 106 in the afternoon.

Sunday Night

Mostly clear. Humid with lows in the upper 70s. South winds 15 to 20 mph with gusts up to 30 mph. Heat index values up to 107 early in the evening.

Monday

Sunny, breezy, hot with highs in the upper 90s. South winds 15 to 25 mph with gusts up to 35 mph. Heat index values up to 108 in the afternoon.

Monday Night

Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Breezy with lows in the mid 70s. Chance of rain 50 percent. Heat index values up to 105 early in the evening.

Tuesday

Mostly sunny. Hot with highs in the mid 90s. Heat index values up to 105.

Tuesday Night

Partly cloudy in the evening, then becoming mostly cloudy. A chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Lows in the lower 70s. Chance of rain 60 percent. Heat index values up to 100 early in the evening.

Wednesday

Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the lower 90s. Chance of rain 20 percent.

Wednesday Night

Partly cloudy with a chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 50 percent.

Thursday

Mostly sunny. Highs in the lower 90s.

Thursday Night

Mostly clear in the evening, then becoming partly cloudy. A chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 50 percent.

Friday

Sunny, hot with highs in the mid 90s. Heat index values up to 100.