As of 12:36 CDT

St. Louis, MO weather in September

90°

St. Louis, Sunday, 9 August, 12:36

Mostly clear. Feels like 103°. High 94°, low 72°.

Pressure29.97 inHg

Wind3 mph E

Humidity66%

Visibility6.2 mi

Dew point77°

See detailed hourly forecast

In September, St. Louis, MO averages a high of 79.5° and a low of 62°. About 3.4 inches of precipitation fall over the month (8 wet days). The record high is 99.3° (2011) and the record low 38.3° (1995). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	84.4°	67.6°	33%	99.3° (2011)	52.3° (1967)
2	84.2°	67.3°	33%	98.2° (2011)	53.6° (1974)
3	84°	66.9°	27%	96.6° (2011)	51.1° (1974)
4	83.1°	66.4°	27%	97.5° (1960)	52.3° (1974)
5	83.3°	65.7°	15%	97.3° (1998)	50.9° (1974)
6	83.5°	65.5°	22%	98.4° (1990)	52° (1988)
7	83.5°	65.3°	20%	96.6° (1960)	48.9° (1988)
8	81.5°	64.9°	42%	97.2° (1960)	49.3° (1986)
9	81.5°	64.2°	30%	97.7° (2013)	51.4° (2024)
10	81.7°	63.3°	22%	97.3° (2013)	49.8° (1969)
11	81.3°	63.5°	25%	94.8° (2013)	52.5° (1993)
12	81.3°	63.7°	32%	93.6° (1980)	52.5° (1968)
13	81.1°	63.5°	18%	95° (2025)	46° (2014)
14	80.2°	62.6°	30%	97.5° (1971)	45.5° (2014)
15	78.3°	61.9°	27%	92.5° (1991)	48.6° (1974)
16	77.9°	62.1°	27%	92.7° (1997)	48.4° (1984)
17	78.4°	61.7°	33%	90.7° (2025)	48.6° (1984)
18	79.7°	62.1°	32%	92.5° (2025)	47.1° (1981)
19	79.9°	62.1°	32%	93.4° (1997)	47.7° (1973)
20	78.8°	61.9°	38%	96.4° (2022)	42.6° (1991)
21	77.9°	60.6°	23%	93° (2022)	43.5° (1991)
22	75.9°	59.5°	28%	92.8° (2005)	41.4° (1983)
23	74.8°	57.7°	27%	91.6° (1961)	38.3° (1995)
24	75°	57.7°	33%	89.2° (2017)	41.7° (1989)
25	75.7°	58.1°	33%	89.1° (2017)	42.3° (1965)
26	75.7°	57.6°	28%	89.8° (2017)	42.4° (2000)
27	75.6°	57°	22%	91.2° (2021)	42.3° (1985)
28	75.2°	56.7°	15%	89.6° (1986)	42.1° (1984)
29	75.4°	56.3°	22%	88.5° (1971)	42.3° (2003)
30	75.7°	56.8°	15%	90.7° (2019)	41.7° (1984)