Cromwell, IA Weather & Growing Conditions
Today
84°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Partly sunny. High near 84, with temperatures falling to around 82 in the afternoon. West wind 5 to 9 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Chance Showers And Thunderstorms | 5 to 9 mph W | 39% |
| Tonight | 63°F | Showers And Thunderstorms | 12 mph NNE | 83% |
| Wednesday | 73°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 9 mph NE | 69% |
| Wednesday Night | 58°F | Chance Showers And Thunderstorms | 3 to 9 mph NE | 34% |
| Thursday | 81°F | Mostly Sunny | 3 mph E | 6% |
| Thursday Night | 62°F | Mostly Clear | 3 mph SE | 6% |
| Friday | 85°F | Sunny | 7 mph S | 6% |
| Friday Night | 67°F | Mostly Clear | 6 mph S | 9% |
| Saturday | 89°F | Sunny | 5 to 12 mph S | 3% |
| Saturday Night | 72°F | Mostly Clear | 12 to 15 mph S | 9% |
| Sunday | 91°F | Mostly Sunny | 14 mph S | 9% |
| Sunday Night | 71°F | Slight Chance Showers And Thunderstorms | 14 mph S | 17% |
| Monday | 91°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 13 to 16 mph SSW | 17% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms | 13 to 16 mph SSE | 24% |
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 Aug 4, 2026.