As of 18:39 CDT

Summit, IL weather in August

82°

Summit, Saturday, 8 August, 18:39

Clear. Feels like 84°. High 83°, low 69°.

Pressure30.00 inHg

Wind7.2 mph W

Humidity55%

Visibility6.2 mi

Dew point64°

See detailed hourly forecast

In August, Summit, IL averages a high of 80.6° and a low of 66.2°. About 3.7 inches of precipitation fall over the month (11 wet days). The record high is 98.6° (2023) and the record low 48.2° (2024). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	82.2°	66.7°	30%	95.5° (2006)	55.8° (1990)
2	82.2°	67.1°	38%	95.4° (1964)	56.3° (1968)
3	82°	66.6°	37%	93.9° (1964)	52.9° (1976)
4	81.1°	66.4°	38%	94.8° (1988)	54.3° (1966)
5	80.2°	66.6°	33%	91.4° (2018)	52.3° (2020)
6	80.8°	66.4°	33%	94.5° (1968)	54° (1994)
7	81.5°	66.6°	40%	93.6° (2001)	55.6° (1994)
8	82.2°	67.3°	37%	95.7° (1983)	55.2° (2017)
9	81.5°	66.9°	40%	94.3° (2001)	53.4° (1972)
10	80.2°	66.9°	47%	91.9° (1983)	50.5° (1972)
11	79.2°	65.8°	37%	91.8° (2016)	52.3° (1965)
12	79.3°	64.9°	32%	93.6° (1995)	51.4° (2004)
13	80.4°	65.8°	30%	92.3° (1995)	54.1° (1967)
14	79.5°	65.8°	33%	92.8° (1988)	48.9° (1964)
15	80.4°	66°	35%	94.1° (2025)	51.6° (2014)
16	81.3°	66.4°	33%	98.1° (1988)	53.2° (1979)
17	81°	66.4°	42%	98.2° (1988)	52.9° (1992)
18	80.2°	66.2°	43%	90.9° (1972)	55.6° (2023)
19	79.9°	66.2°	42%	96.6° (1983)	57.4° (1977)
20	79.5°	66.2°	33%	91.9° (1968)	54.7° (1992)
21	80.4°	65.3°	27%	95.2° (1983)	52° (2024)
22	80.4°	65.7°	35%	93° (1968)	48.2° (2024)
23	79.9°	66°	35%	97.7° (2023)	53.8° (2024)
24	80.6°	65.8°	28%	98.6° (2023)	55.9° (1966)
25	80.8°	65.5°	28%	92.1° (2021)	50.7° (2017)
26	81.1°	66.6°	33%	95.5° (2024)	53.6° (2025)
27	81°	67.1°	33%	97° (2024)	54.3° (2025)
28	80.2°	66.4°	37%	92.8° (1984)	50.9° (1986)
29	80.4°	65.7°	32%	93.9° (1984)	48.6° (1965)
30	79.3°	65.1°	30%	93.6° (2013)	53.4° (1988)
31	78.8°	64.6°	25%	90° (2012)	54.3° (2023)