Mason, IL Weather & Growing Conditions
This Afternoon
76°F
Chance Light Rain
A chance of rain after 3pm. Mostly cloudy, with a high near 76. South southeast wind 16 to 20 mph, with gusts as high as 33 mph. Chance of precipitation is 30%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Chance Light Rain | 16 to 20 mph SSE | 27% |
| Tonight | 55°F | Rain | 10 to 16 mph S | 89% |
| Wednesday | 64°F | Slight Chance Light Rain then Mostly Cloudy | 7 to 13 mph SW | 20% |
| Wednesday Night | 43°F | Mostly Cloudy | 5 mph WSW | 0% |
| Thursday | 65°F | Sunny | 5 to 12 mph WSW | 0% |
| Thursday Night | 43°F | Mostly Cloudy | 2 mph WNW | 3% |
| Friday | 58°F | Mostly Cloudy | 3 to 9 mph NNW | 6% |
| Friday Night | 41°F | Partly Cloudy | 5 mph NNW | 1% |
| Saturday | 58°F | Mostly Sunny | 5 mph NNW | 1% |
| Saturday Night | 37°F | Partly Cloudy | 1 mph NW | 2% |
| Sunday | 60°F | Mostly Sunny | 1 to 7 mph WNW | 7% |
| Sunday Night | 36°F | Partly Cloudy | 3 mph WNW | 6% |
| Monday | 60°F | Sunny | 3 to 7 mph W | 5% |
| Monday Night | 37°F | Mostly Clear | 2 mph SW | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mason, IL
Last spring frost
Apr 13
First fall frost
Oct 24
Growing season
191 days
Hardiness zone
6b
Explore more for Mason, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Effingham 3Sw, Il (11.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.