New Haven, IL Weather & Growing Conditions
Today
87°F
Sunny
Sunny. High near 87, with temperatures falling to around 85 in the afternoon. East northeast wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 3 mph ENE | 0% |
| Tonight | 64°F | Mostly Clear | 0 to 3 mph NNE | 0% |
| Wednesday | 89°F | Sunny | 1 mph SW | 0% |
| Wednesday Night | 68°F | Mostly Clear | 2 mph SSE | 1% |
| Thursday | 90°F | Slight Chance Rain Showers | 2 to 6 mph SSW | 15% |
| Thursday Night | 71°F | Chance Showers And Thunderstorms | 5 mph S | 38% |
| Friday | 89°F | Chance Showers And Thunderstorms | 2 to 6 mph SSW | 39% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 3 mph SSW | 33% |
| Saturday | 89°F | Chance Showers And Thunderstorms | 5 mph SW | 32% |
| Saturday Night | 70°F | Chance Showers And Thunderstorms then Partly Cloudy | 3 mph S | 27% |
| Sunday | 91°F | Mostly Sunny | 3 to 8 mph SSW | 11% |
| Sunday Night | 72°F | Mostly Clear | 3 to 7 mph SSW | 8% |
| Monday | 93°F | Sunny | 5 to 8 mph SSW | 7% |
| Monday Night | 73°F | Mostly Clear | 7 mph SSW | 11% |
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 Aug 4, 2026.