Williamson Airport Weather Forecast
- 75
- 91
Becoming Sunny
- 75
- 92
Chance Thunderstorms
- 73
- 89
Chance Thunderstorms
- 72
- 88
Chance Thunderstorms
- 72
- 89
Slight Chance Thunderstorms
- 72
- 90
Mostly Sunny
Today 23 Jul Cumberland
Mostly sunny. Humid with Highs in the lower 90s. South Winds around 5 Mph. Heat index Values up to 104.
Tonight 23 Jul Cumberland
Mostly clear. Near steady temperature in the mid 70s. Southeast Winds around 5 Mph.
Williamson Airport Temperature Statistics
July Temperature
Mattoon / Charleston, Coles County Memorial Airport (13 miles)
Lowest 8 July, 2025
64.7 °FAverage July
77.8 °FHighest 6 July, 2025
90.6 °F
Climate (2020–Present)
Mattoon / Charleston, Coles County Memorial Airport (13 miles)
Average Low 2020–2025
45.7 °FAverage 2020–2025
55 °FAverage High 2020–2025
64.4 °F