Raritan, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Raritan, a village in Henderson County, Illinois.
This Afternoon
79°F
Mostly Sunny
Mostly sunny, with a high near 79. East wind around 10 mph.
7-day forecast for Raritan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Mostly Sunny | 10 mph E | 5% |
| Tonight | 69°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph SE | 24% |
| Saturday | 86°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph S | 17% |
| Saturday Night | 66°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 mph NW | 72% |
| Sunday | 75°F | Showers And Thunderstorms Likely | 5 to 10 mph N | 72% |
| Sunday Night | 59°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 10 to 15 mph NE | 69% |
| Monday | 65°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 65% |
| Monday Night | 54°F | Chance Rain Showers | 10 to 15 mph NE | 50% |
| Tuesday | 63°F | Chance Rain Showers | 10 mph NE | 31% |
| Tuesday Night | 49°F | Mostly Cloudy | 5 to 10 mph NE | 6% |
| Wednesday | 66°F | Mostly Sunny | 5 mph NE | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Thursday | 68°F | Partly Sunny | 5 mph NE | 4% |
| Thursday Night | 54°F | Partly Cloudy | 0 to 5 mph NE | 5% |
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 Sep 18, 2026.