New Haven, IA Weather & Growing Conditions
Today
73°F
Chance Showers And Thunderstorms
Scattered rain showers before 2pm, then a chance of showers and thunderstorms. Mostly cloudy. High near 73, with temperatures falling to around 70 in the afternoon. Northwest wind around 10 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Chance Showers And Thunderstorms | 10 mph NW | 70% |
| Tonight | 58°F | Chance Showers And Thunderstorms | 3 to 7 mph NW | 63% |
| Wednesday | 74°F | Mostly Sunny | 5 mph N | 3% |
| Wednesday Night | 54°F | Mostly Clear | 3 mph NW | 1% |
| Thursday | 78°F | Sunny | 1 to 5 mph S | 0% |
| Thursday Night | 59°F | Mostly Clear | 5 mph S | 1% |
| Friday | 81°F | Sunny | 5 to 12 mph S | 10% |
| Friday Night | 64°F | Mostly Clear | 9 mph S | 13% |
| Saturday | 83°F | Sunny | 6 to 10 mph S | 11% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 12 mph S | 34% |
| Sunday | 83°F | Chance Showers And Thunderstorms | 10 mph S | 34% |
| Sunday Night | 67°F | Slight Chance Showers And Thunderstorms | 8 mph S | 33% |
| Monday | 82°F | Chance Showers And Thunderstorms | 10 mph SE | 33% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 10 mph NE | 38% |
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 Aug 4, 2026.