Chatham Weather Forecast
- 63
- 81
Chance Thunderstorms
- 67
- 87
Mostly Sunny
- 68
- 88
Rain Showers Likely
- 56
- 85
Thunderstorms Likely
- 49
- 71
Mostly Cloudy
- 50
- 71
Partly Sunny
Today 16 May Sangamon
Mostly cloudy with a chance of Showers and Thunderstorms. Highs in the lower 80s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 50 percent.
Tonight 16 May Sangamon
Mostly cloudy with a slight chance of Thunderstorms. A slight chance of Showers. Lows in the mid 60s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 20 percent.
Chatham Temperature Statistics
May Temperature
Springfield - Abraham Lincoln Capital Airport (11.2 miles)
Lowest 7 May, 2026
39.7 °FAverage May
58.4 °FHighest 12 May, 2026
83.6 °F
Climate (2021–Present)
Springfield - Abraham Lincoln Capital Airport (11.2 miles)
Average Low 2021–2026
45 °FAverage 2021–2026
55.5 °FAverage High 2021–2026
65.6 °F