Summit Weather Forecast
- 67
- 81
Mostly Cloudy
- 67
- 84
Partly Sunny
- 70
- 87
Mostly Sunny
- 72
- 89
Mostly Sunny
- 74
- 90
Mostly Sunny
- 73
- 90
Mostly Sunny
Today 10 Jul Central Cook
Mostly cloudy. Patchy fog early in the morning. A slight chance of Showers and Thunderstorms early in the afternoon. Highs in the lower 80s Inland, but only in the mid 70s near the lake. Northeast Winds 5 to 10 Mph. Chance of precipitation 20 percent.
Tonight 10 Jul Central Cook
Mostly cloudy. Lows in the upper 60s. North Winds 5 to 10 Mph.
Summit Temperature Statistics
July Temperature
Chicago, Chicago Midway Airport (2.5 miles)
Lowest 5 July, 2026
66.9 °FAverage July
77.8 °FHighest 1 July, 2026
93.9 °F
Climate (2021–2026)
Chicago, Chicago Midway Airport (2.5 miles)
Average Low 2021–2026
46.7 °FAverage 2021–2026
54.3 °FAverage High 2021–2026
61.9 °F