Prospect Heights Weather Forecast
- 63
- 77
Rain Showers
- 56
- 70
Rain Showers Likely
- 53
- 65
Slight Chance Rain Showers
- 53
- 63
Slight Chance Rain Showers
- 53
- 65
Mostly Cloudy
- 54
- 68
Mostly Cloudy
Today 19 Sep Northern Cook
Thunderstorms likely in the morning. Showers. A chance of Thunderstorms in the afternoon. Some Thunderstorms may produce heavy rainfall in the morning. Highs in the mid 70s. Southeast Winds 5 to 10 Mph. Chance of precipitation near 100 percent.
Tonight 19 Sep Northern Cook
Thunderstorms likely until early morning. Showers. A chance of Thunderstorms late. Humid with Lows in the lower 60s. East Winds around 5 Mph, becoming north after midnight. Chance of precipitation near 100 percent.
Prospect Heights Temperature Statistics
September Temperature
Chicago / Wheeling, Pal-Waukee Airport (2.5 miles)
Lowest 14 September, 2026
50.6 °FAverage September
73.6 °FHighest 2 September, 2026
96.7 °F
Climate (2021–2026)
Chicago / Wheeling, Pal-Waukee Airport (2.5 miles)
Average Low 2021–2026
44 °FAverage 2021–2026
52.8 °FAverage High 2021–2026
61.5 °F