Cromwell, IA Weather & Growing Conditions
Overnight
43°F
Cloudy
Cloudy. Low around 43, with temperatures rising to around 45 overnight. West northwest wind around 16 mph, with gusts as high as 23 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 43°F | Cloudy | 16 mph WNW | 13% |
| Wednesday | 50°F | Cloudy | 14 to 17 mph W | 14% |
| Wednesday Night | 42°F | Mostly Cloudy then Slight Chance Rain Showers | 13 mph W | 24% |
| Thursday | 52°F | Chance Rain Showers then Cloudy | 12 mph NW | 33% |
| Thursday Night | 39°F | Mostly Cloudy | 6 to 9 mph N | 7% |
| Friday | 50°F | Partly Sunny | 3 to 7 mph N | 1% |
| Friday Night | 31°F | Partly Cloudy | 2 mph E | 0% |
| Saturday | 53°F | Mostly Sunny | 1 to 5 mph SSW | 0% |
| Saturday Night | 35°F | Mostly Clear | 5 mph WSW | 0% |
| Sunday | 59°F | Sunny | 6 mph W | 0% |
| Sunday Night | 38°F | Clear | 6 mph SW | 0% |
| Monday | 65°F | Sunny | 6 to 10 mph SW | 0% |
| Monday Night | 42°F | Mostly Clear | 6 mph WNW | 0% |
| Tuesday | 64°F | Sunny | 5 mph NNW | 0% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Cromwell, IA
Last spring frost
Apr 28
First fall frost
Oct 11
Growing season
164 days
Hardiness zone
5b
Explore more for Cromwell, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Creston 2 Sw, Ia (3.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.