As of 15:33 CDT

Waterloo, IA weather in September

81°

Waterloo, Saturday, 8 August, 15:33

Clear. Feels like 83°. High 81°, low 60°.

Pressure30.00 inHg

Wind4 mph W

Humidity60%

Visibility6.2 mi

Dew point66°

See detailed hourly forecast

In September, Waterloo, IA averages a high of 73.2° and a low of 56.4°. About 3.5 inches of precipitation fall over the month (9 wet days). The record high is 95.2° (2013) and the record low 31.6° (1967). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	78.1°	61.3°	27%	91° (2011)	46° (1967)
2	78.6°	61.9°	30%	92.3° (2023)	47.1° (1968)
3	77.4°	61.9°	25%	94.6° (2023)	42.8° (1974)
4	77.5°	60.4°	23%	94.6° (2023)	43.2° (1974)
5	77.5°	60.1°	23%	91.9° (2023)	42.8° (1962)
6	77.4°	60.3°	25%	91.8° (1960)	44.2° (1962)
7	76.8°	60.4°	28%	92.5° (1978)	44.6° (2025)
8	75.6°	59°	28%	91.8° (1978)	43° (1986)
9	75.6°	58.5°	23%	95.2° (2013)	43.9° (2008)
10	75.2°	58.1°	28%	92.3° (2013)	45.7° (1969)
11	75.9°	58.1°	27%	90° (2000)	43.2° (1992)
12	75.2°	58.3°	30%	87.3° (1984)	42.1° (2007)
13	73.8°	57.9°	33%	87.3° (1994)	36.9° (2014)
14	72.7°	56.1°	28%	88.7° (2025)	43.9° (1989)
15	72.3°	56.3°	28%	88.5° (2017)	36.9° (2007)
16	72.5°	55.8°	30%	87.1° (2017)	40.1° (1984)
17	73°	56.1°	25%	87.4° (1988)	42.4° (1980)
18	73.8°	56.7°	33%	86° (2000)	40.6° (1973)
19	73.4°	57.2°	42%	86.7° (2021)	37.8° (1991)
20	72.3°	55.6°	37%	89.8° (2022)	33.1° (1991)
21	70.5°	54.5°	32%	85.8° (2017)	39° (1982)
22	68.5°	53.1°	37%	88.7° (2017)	34.5° (1974)
23	67.6°	51.4°	28%	87.4° (2017)	34.5° (1983)
24	69.1°	52.5°	33%	86.2° (2017)	37.4° (1989)
25	70°	52.5°	35%	85.1° (2017)	38.3° (2001)
26	69.8°	52°	28%	84.9° (1998)	34.2° (1984)
27	69.3°	52.2°	15%	82.6° (2021)	39.4° (1985)
28	67.6°	51.3°	30%	85.5° (1971)	35.6° (1961)
29	68.5°	50.9°	28%	85.6° (2021)	31.6° (1967)
30	70°	51.8°	15%	89.2° (2023)	34.3° (1972)