As of 22:07 CDT

Forest Park, IL weather in September

73°

Forest Park, Saturday, 8 August, 22:07

Clear. Feels like 73°. High 83°, low 69°.

Pressure30.03 inHg

Wind2.8 mph W

Humidity75%

Visibility6.2 mi

Dew point63°

See detailed hourly forecast

In September, Forest Park, IL averages a high of 73.5° and a low of 59.7°. About 3.2 inches of precipitation fall over the month (10 wet days). The record high is 94.1° (2013) and the record low 37.4° (1995). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	78.3°	64.6°	30%	93.2° (2011)	54.1° (1987)
2	78.8°	64.8°	25%	91.2° (2011)	51.1° (2017)
3	78.6°	64.6°	27%	93.9° (2023)	52° (1974)
4	77.4°	63.9°	33%	91.9° (2023)	49.8° (2025)
5	77.5°	63.1°	27%	90.7° (2023)	53.1° (1974)
6	77.2°	63.3°	38%	91.8° (1990)	49.3° (2025)
7	77.4°	62.8°	32%	92.1° (1960)	47.7° (2025)
8	75.7°	62.4°	35%	91.4° (1978)	47.5° (2024)
9	75.4°	62.1°	32%	91.9° (1983)	50.5° (2025)
10	76.3°	61.3°	30%	94.1° (2013)	50.5° (2017)
11	75.9°	61.3°	32%	90° (2005)	47.8° (1993)
12	75.7°	61.2°	30%	89.6° (2005)	46.8° (2014)
13	75.2°	61.2°	38%	91.6° (2005)	43.9° (2014)
14	73.9°	60.3°	32%	86.4° (1991)	45.1° (1975)
15	72.7°	59.5°	23%	87.4° (2024)	46.6° (2007)
16	72.3°	59.2°	25%	87.3° (2017)	48.2° (1966)
17	73.6°	59.5°	38%	88.3° (2018)	48.4° (2014)
18	73.6°	59.5°	35%	86.9° (2025)	48.4° (1973)
19	73.8°	60.1°	33%	90.5° (2024)	44.4° (2020)
20	73.4°	59°	48%	90.1° (2017)	44.8° (1991)
21	72°	58.5°	32%	91.6° (2017)	45° (1983)
22	70.2°	57.4°	47%	91° (2017)	39.9° (1995)
23	68.7°	55°	32%	91.2° (2017)	37.4° (1995)
24	69.3°	55.6°	25%	89.4° (2017)	43.3° (1976)
25	69.8°	55.8°	42%	89.6° (2017)	44.4° (2001)
26	69.8°	55.8°	28%	88.3° (2017)	44.2° (1984)
27	69.1°	55.6°	28%	86° (2025)	42.8° (1991)
28	67.3°	55°	27%	83.3° (1971)	43.7° (1961)
29	67.8°	53.6°	30%	86.5° (2025)	38.3° (1967)
30	68.7°	54.1°	17%	85.3° (2019)	38.1° (1993)