As of 13:15 CDT

Ottumwa, IA weather in September

86°

Ottumwa, Sunday, 9 August, 13:15

Partly cloudy. Feels like 95°. High 93°, low 70°.

Pressure29.83 inHg

Wind16.2 mph SW

Humidity67%

Visibility6.2 mi

Dew point73°

See detailed hourly forecast

In September, Ottumwa, IA averages a high of 76.1° and a low of 59°. About 3.4 inches of precipitation fall over the month (8 wet days). The record high is 98.2° (2013) and the record low 33.4° (1984). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	81.3°	64.4°	28%	97.2° (1984)	47.3° (1967)
2	81.5°	64.6°	27%	95.7° (2000)	52.3° (1974)
3	80.6°	64.2°	27%	94.6° (1960)	45.5° (1974)
4	80.1°	63°	25%	95.4° (1960)	42.3° (1974)
5	80.4°	62.8°	17%	94.8° (1960)	46.8° (1962)
6	79.9°	63.3°	27%	95.4° (1960)	46.9° (1962)
7	80.2°	62.6°	35%	95.9° (2013)	46.6° (2025)
8	78.6°	61.5°	30%	93.4° (1971)	44.1° (1986)
9	78.3°	61°	18%	98.2° (2013)	44.1° (2008)
10	78.3°	60.4°	27%	95.2° (2013)	46.6° (1969)
11	78.8°	60.6°	27%	93° (2000)	46.8° (1992)
12	78.3°	61.2°	20%	90.9° (2025)	45.5° (2007)
13	76.8°	60.4°	30%	94.3° (2025)	39.7° (2014)
14	75.9°	59.2°	27%	93.6° (2025)	44.6° (2014)
15	75°	58.3°	27%	92.5° (2017)	41.5° (2007)
16	75°	58.3°	20%	90.1° (2017)	42.4° (2014)
17	75.7°	58.8°	30%	91.9° (1988)	45.9° (1981)
18	76.3°	59°	42%	89.1° (2019)	42.8° (1973)
19	76.1°	59.7°	45%	89.8° (2013)	39.7° (1991)
20	75°	58.5°	33%	91° (2018)	37° (1991)
21	73.4°	57°	30%	89.8° (2007)	42.1° (1983)
22	72.1°	55.6°	32%	90.1° (1988)	36.5° (1995)
23	71.1°	54.3°	27%	89.1° (2007)	36.3° (1983)
24	72.1°	55°	23%	88.3° (2007)	37° (1989)
25	72.5°	55°	35%	85.8° (1999)	40.8° (2001)
26	72.3°	54.3°	23%	85.8° (1998)	37.9° (1984)
27	72°	54.5°	12%	86.5° (2021)	40.5° (1985)
28	70.7°	54°	25%	86° (2025)	40.5° (1961)
29	72°	53.4°	22%	87.1° (2002)	33.4° (1984)
30	72.9°	54.5°	17%	90.5° (2023)	37.2° (1984)