New Haven, IA Weather & Growing Conditions
Tonight
47°F
Rain Showers
Rain showers. Cloudy. Low around 47, with temperatures rising to around 52 overnight. North wind around 9 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 47°F | Rain Showers | 9 mph N | 84% |
| Wednesday | 51°F | Rain Showers | 10 to 15 mph SW | 79% |
| Wednesday Night | 42°F | Rain Showers | 15 mph W | 75% |
| Thursday | 50°F | Rain Showers Likely | 14 mph NW | 69% |
| Thursday Night | 36°F | Mostly Cloudy | 8 to 12 mph N | 10% |
| Friday | 48°F | Partly Sunny | 5 to 9 mph N | 0% |
| Friday Night | 29°F | Partly Cloudy | 2 mph NW | 1% |
| Saturday | 52°F | Mostly Sunny | 1 to 6 mph SW | 2% |
| Saturday Night | 34°F | Partly Cloudy | 6 mph W | 5% |
| Sunday | 58°F | Sunny | 8 mph W | 9% |
| Sunday Night | 36°F | Mostly Clear | 6 mph SW | 1% |
| Monday | 60°F | Mostly Sunny | 6 to 12 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 7 mph W | 1% |
| Tuesday | 58°F | Mostly Sunny | 7 mph NW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for New Haven, IA
Last spring frost
Apr 30
First fall frost
Oct 9
Growing season
163 days
Hardiness zone
5a
Explore more for New Haven, IA: full frost dates · planting calendar · Iowa frost dates
Climate data from the nearest NOAA station, Osage, Ia (7.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.