Mason, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mason, a town in Effingham County, Illinois.
This Afternoon
96°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Sunny, with a high near 96. Heat index values as high as 104. Northeast wind around 5 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Mason
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 96°F | Chance Showers And Thunderstorms | 5 mph NE | 29% |
| Tonight | 71°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 6 mph ESE | 23% |
| Saturday | 94°F | Mostly Sunny | 3 to 8 mph SSW | 10% |
| Saturday Night | 71°F | Mostly Cloudy | 3 to 7 mph SSW | 6% |
| Sunday | 92°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 7 mph WNW | 20% |
| Sunday Night | 64°F | Chance Showers And Thunderstorms | 7 mph NNE | 43% |
| Monday | 79°F | Rain Showers Likely | 7 to 10 mph NE | 57% |
| Monday Night | 58°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 7 to 13 mph NNE | 55% |
| Tuesday | 72°F | Chance Showers And Thunderstorms | 12 mph NNE | 36% |
| Tuesday Night | 54°F | Mostly Cloudy | 5 to 12 mph NNE | 6% |
| Wednesday | 74°F | Partly Sunny | 6 to 9 mph N | 3% |
| Wednesday Night | 54°F | Partly Cloudy | 2 to 9 mph NNE | 3% |
| Thursday | 75°F | Mostly Sunny | 3 to 8 mph NNE | 3% |
| Thursday Night | 56°F | Partly Cloudy | 2 to 7 mph NNE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Mason (38.954, -88.627). Updated through the day.
Growing snapshot for Mason
Last spring frost
Apr 13
First fall frost
Oct 24
Growing season
191 days
Hardiness zone
6b
More local growing data for Mason: nearby ZIP 62443 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Effingham 3Sw, Il (11.2 mi from Mason). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.