Raritan, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Raritan, a village in Henderson County, Illinois.
Today
86°F
Sunny
Sunny, with a high near 86. South wind 5 to 10 mph.
7-day forecast for Raritan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Sunny | 5 to 10 mph S | 1% |
| Tonight | 68°F | Chance Showers And Thunderstorms | 0 to 5 mph SE | 27% |
| Wednesday | 81°F | Chance Showers And Thunderstorms | 5 mph SW | 64% |
| Wednesday Night | 64°F | Showers And Thunderstorms | 0 to 5 mph N | 87% |
| Thursday | 80°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 0 to 5 mph NE | 65% |
| Thursday Night | 63°F | Partly Cloudy | 0 mph | 11% |
| Friday | 82°F | Mostly Sunny | 0 mph | 7% |
| Friday Night | 65°F | Mostly Clear | 0 to 5 mph SE | 13% |
| Saturday | 85°F | Sunny | 5 mph S | 13% |
| Saturday Night | 70°F | Mostly Clear | 5 to 10 mph S | 8% |
| Sunday | 87°F | Sunny | 10 mph SW | 8% |
| Sunday Night | 71°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 20% |
| Monday | 87°F | Slight Chance Showers And Thunderstorms | 10 mph SW | 20% |
| Monday Night | 71°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 28% |
Forecast source: National Weather Service (api.weather.gov) for Raritan (40.696, -90.825). Updated through the day.
Growing snapshot for Raritan
Last spring frost
Apr 21
First fall frost
Oct 19
Growing season
180 days
More local growing data for Raritan: nearby ZIP 61471 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, La Harpe, Il (10.8 mi from Raritan). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.