Raritan, IL Weather & Growing Conditions
Today
88°F
Sunny
Sunny, with a high near 88. South wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Sunny | 5 to 10 mph S | 1% |
| Tonight | 68°F | Chance Showers And Thunderstorms | 0 to 5 mph SE | 29% |
| 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 | 63% |
| 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 | 71°F | Mostly Clear | 5 to 10 mph S | 9% |
| Sunday | 87°F | Sunny | 10 mph SW | 9% |
| Sunday Night | 71°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 21% |
| Monday | 87°F | Slight Chance Showers And Thunderstorms | 10 mph SW | 21% |
| Monday Night | 71°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 28% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Raritan, IL
Last spring frost
Apr 21
First fall frost
Oct 19
Growing season
180 days
Hardiness zone
5b
Explore more for Raritan, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, La Harpe, Il (12 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.