As of 05:26 CDT

Joliet, IL weather in September

64°

Joliet, Sunday, 9 August, 05:26

Clear. Feels like 65°. High 86°, low 64°.

Pressure30.00 inHg

Wind4.1 mph S

Humidity97%

Visibility6.2 mi

Dew point63°

See detailed hourly forecast

In September, Joliet, IL averages a high of 74.6° and a low of 58.3°. About 3.1 inches of precipitation fall over the month (9 wet days). The record high is 96.1° (2011) and the record low 34.9° (1984). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	79.7°	63.1°	30%	96.1° (2011)	48.6° (2009)
2	79.7°	63.3°	22%	93.6° (2008)	47.1° (2017)
3	79.5°	63.3°	25%	93.2° (2023)	48.6° (1974)
4	78.4°	62.1°	28%	91.8° (2023)	46.9° (1974)
5	78.6°	61.7°	17%	90° (1983)	50.2° (1974)
6	78.1°	62.1°	37%	91.9° (1990)	48.2° (1988)
7	78.4°	61.3°	35%	92.8° (1960)	47.3° (2025)
8	76.8°	61°	32%	90.9° (1960)	43° (1986)
9	76.6°	60.4°	32%	93.9° (2013)	47.7° (1986)
10	77.2°	59.9°	22%	93.6° (2013)	47.1° (1969)
11	77°	59.9°	28%	91° (2005)	44.6° (1993)
12	77°	59.9°	32%	90.5° (2005)	45.3° (2014)
13	76.1°	60.1°	27%	92.3° (2005)	42.3° (2014)
14	75°	59°	32%	88.9° (1991)	41.9° (1975)
15	73.9°	58.1°	23%	88.9° (1991)	43.3° (2007)
16	73.2°	57.9°	27%	86.5° (2024)	44.4° (1966)
17	74.7°	58.3°	35%	88.3° (1988)	44.4° (2014)
18	75°	57.9°	27%	87.8° (2007)	44.4° (1973)
19	74.7°	58.8°	35%	87.4° (1978)	42.8° (1991)
20	74.3°	57.9°	42%	89.4° (2017)	40.6° (1991)
21	72.9°	57°	28%	90.5° (2017)	41.4° (1991)
22	71.1°	56.1°	37%	91° (2017)	38.5° (1995)
23	70°	53.6°	32%	90.1° (2017)	36.5° (1974)
24	70.3°	54.1°	27%	90.9° (2007)	39.9° (2012)
25	70.7°	54.5°	35%	88.3° (2017)	41.7° (2001)
26	71.1°	54.5°	28%	88.7° (2017)	42.8° (1984)
27	70.2°	54.3°	25%	84.9° (2021)	39° (1991)
28	68.7°	53.4°	25%	84.9° (1971)	41.2° (1964)
29	69.3°	52.3°	30%	85.5° (2025)	37.6° (1967)
30	70.3°	52.9°	12%	86° (1971)	34.9° (1984)