Chatham Weather Forecast
- 53
- 81
Rain Showers
- 45
- 68
Mostly Cloudy
- 52
- 71
Mostly Cloudy
- 56
- 71
Chance Thunderstorms
- 58
- 78
Chance Rain Showers
- 62
- 82
Slight Chance Thunderstorms
Today 19 May Sangamon
Mostly cloudy. A chance of Showers and Thunderstorms in the Morning, then Showers and Thunderstorms likely in the afternoon. Highs in the lower 80s. Temperature falling into the mid 70s in the afternoon. Southwest Winds 15 to 20 Mph, becoming west in the afternoon. Chance of rain 70 percent.
Tonight 19 May Sangamon
Mostly cloudy with a chance of Showers and Thunderstorms. Near steady temperature in the upper 60s. South Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 50 percent.
Chatham Temperature Statistics
May Temperature
Springfield - Abraham Lincoln Capital Airport (11.2 miles)
Lowest 7 May, 2026
39.7 °FAverage May
59.5 °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