Raritan, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Raritan, a village in Henderson County, Illinois.
Tonight
51°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 4am. Mostly cloudy. Low around 51, with temperatures rising to around 53 overnight. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 70%.
7-day forecast for Raritan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Showers And Thunderstorms Likely | 10 to 15 mph S | 67% |
| Wednesday | 55°F | Slight Chance Rain Showers | 15 mph SW | 19% |
| Wednesday Night | 44°F | Mostly Cloudy | 10 to 15 mph SW | 7% |
| Thursday | 55°F | Mostly Cloudy then Slight Chance Rain Showers | 10 to 15 mph W | 17% |
| Thursday Night | 43°F | Chance Rain Showers | 5 to 10 mph NW | 31% |
| Friday | 53°F | Mostly Cloudy | 5 to 10 mph N | 11% |
| Friday Night | 36°F | Mostly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 53°F | Mostly Sunny | 0 to 5 mph NW | 1% |
| Saturday Night | 36°F | Mostly Clear | 0 to 5 mph W | 2% |
| Sunday | 59°F | Sunny | 5 to 10 mph W | 9% |
| Sunday Night | 37°F | Mostly Clear | 5 mph W | 3% |
| Monday | 63°F | Sunny | 5 to 10 mph SW | 1% |
| Monday Night | 41°F | Mostly Clear | 5 mph W | 0% |
| Tuesday | 64°F | Sunny | 5 mph NW | 0% |
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 Nov 4, 2026.