New Haven, IL Weather & Growing Conditions
This Afternoon
66°F
Mostly Cloudy
Mostly cloudy. High near 66, with temperatures falling to around 64 in the afternoon. West wind 8 to 13 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Mostly Cloudy | 8 to 13 mph W | 0% |
| Tonight | 44°F | Partly Cloudy | 5 mph SW | 0% |
| Thursday | 68°F | Sunny | 3 to 9 mph WSW | 0% |
| Thursday Night | 44°F | Partly Cloudy | 2 mph WNW | 0% |
| Friday | 61°F | Partly Sunny | 2 to 12 mph NNW | 0% |
| Friday Night | 36°F | Partly Cloudy | 3 to 10 mph NNW | 0% |
| Saturday | 57°F | Mostly Sunny | 6 mph NNW | 0% |
| Saturday Night | 32°F | Partly Cloudy | 2 mph NNW | 0% |
| Sunday | 60°F | Sunny | 0 to 7 mph NW | 1% |
| Sunday Night | 33°F | Mostly Clear | 0 to 3 mph NNW | 1% |
| Monday | 64°F | Sunny | 0 to 5 mph WSW | 0% |
| Monday Night | 37°F | Clear | 2 mph SW | 1% |
| Tuesday | 69°F | Sunny | 1 to 6 mph W | 1% |
| Tuesday Night | 39°F | Mostly Clear | 2 mph WNW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for New Haven, IL
Last spring frost
Apr 5
First fall frost
Oct 31
Growing season
209 days
Hardiness zone
7a
Explore more for New Haven, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Jt Myers Locks & Dam, In (9.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.