DeWitt, IA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for DeWitt, a city in Clinton County, Iowa.

Overnight

66°F

Patchy Fog

Patchy fog and a chance of showers and thunderstorms. Mostly cloudy. Low around 66, with temperatures rising to around 68 overnight. Southeast wind around 5 mph. Chance of precipitation is 30%. New rainfall amounts between a quarter and half of an inch possible.

7-day forecast for DeWitt

When	Temp	Forecast	Wind	Precip
Overnight	66°F	Patchy Fog	5 mph SE	34%
Saturday	81°F	Patchy Fog	5 to 10 mph SE	88%
Saturday Night	63°F	Chance Showers And Thunderstorms then Showers And Thunderstorms	5 to 10 mph NW	83%
Sunday	69°F	Rain Showers Likely	10 mph NE	70%
Sunday Night	57°F	Chance Rain Showers	10 mph NE	40%
Monday	64°F	Chance Rain Showers	10 mph NE	53%
Monday Night	51°F	Chance Rain Showers	5 to 10 mph NE	43%
Tuesday	63°F	Slight Chance Rain Showers	5 to 10 mph NE	20%
Tuesday Night	48°F	Partly Cloudy	5 mph NE	6%
Wednesday	67°F	Mostly Sunny	5 mph NE	2%
Wednesday Night	51°F	Partly Cloudy	0 to 5 mph NE	1%
Thursday	68°F	Mostly Sunny	0 to 5 mph NE	5%
Thursday Night	52°F	Partly Cloudy	0 mph	5%
Friday	71°F	Mostly Sunny	0 to 5 mph NE	4%

Forecast source: National Weather Service (api.weather.gov) for DeWitt (41.823, -90.544). Updated through the day.

Growing snapshot for DeWitt

Last spring frost

Apr 22

First fall frost

Oct 16

Growing season

175 days

Hardiness zone

More local growing data for DeWitt: nearby ZIP 52742 weather · frost dates · planting calendar · Iowa frost dates

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Climate data from the nearest NOAA station, Clinton #1, Ia (13.5 mi from DeWitt). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.