Ottumwa climate

Ottumwa Weather in August

NOAA 1991-2020 normals for Ottumwa Industrial AP, 10.2 km from Ottumwa

Average highs run from 85°F on August 1 to 82°F on August 31, and lows from 64°F to 59°F. Normal precipitation for the month is 4.44 in over about 9 wet days.

August day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Ottumwa, in °F, with the record for each date.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
84°F
Average low
62°F
Precipitation
4.44 in
Record high
105°FAug 18, 1983
Record low
41°FAug 20, 1950
Chance of a freeze
0%
Days of 90°F or more
5.2
Daylight
14 h 20 min to 13 h 09 min
Cloud cover
50%
Humidity
71%
Dew point
63°F
Wind
7.6 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Aug 185°F64°F102°F 198855°F 197330%0%
Aug 285°F64°F104°F 201151°F 200930%0%
Aug 385°F64°F102°F 198353°F 202030%0%
Aug 485°F64°F103°F 195449°F 202030%0%
Aug 585°F64°F96°F 201849°F 202030%0%
Aug 685°F64°F96°F 202249°F 200430%0%
Aug 785°F64°F100°F 198849°F 198930%0%
Aug 885°F64°F102°F 198850°F 201730%0%
Aug 985°F63°F97°F 201851°F 197230%0%
Aug 1085°F63°F100°F 198349°F 202430%0%
Aug 1185°F63°F100°F 198349°F 201230%0%
Aug 1285°F63°F97°F 199547°F 200430%0%
Aug 1385°F63°F97°F 196548°F 196429%0%
Aug 1484°F63°F99°F 198847°F 201329%0%
Aug 1584°F63°F104°F 198845°F 200429%0%
Aug 1684°F62°F103°F 198349°F 201329%0%
Aug 1784°F62°F104°F 198349°F 201229%0%
Aug 1884°F62°F105°F 198347°F 201229%0%
Aug 1984°F62°F101°F 198348°F 195029%0%
Aug 2084°F62°F101°F 198341°F 195029%0%
Aug 2184°F61°F99°F 198348°F 195029%0%
Aug 2283°F61°F97°F 196850°F 202429%0%
Aug 2383°F61°F102°F 194846°F 198429%0%
Aug 2483°F61°F103°F 202348°F 198429%0%
Aug 2583°F60°F101°F 200347°F 195829%0%
Aug 2683°F60°F102°F 198344°F 202529%0%
Aug 2783°F60°F97°F 195547°F 198629%0%
Aug 2883°F60°F98°F 198442°F 198629%0%
Aug 2982°F59°F98°F 198449°F 196529%0%
Aug 3082°F59°F101°F 201347°F 200929%0%
Aug 3182°F59°F98°F 195343°F 196729%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Ottumwa, in percent, and of at least 0.1 inch of snowfall.01020301102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

August 1
sunrise 6:06 AM, sunset 8:26 PM
August 31
sunrise 6:35 AM, sunset 7:44 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00014950 (Ottumwa Industrial AP), public domain. Records: NOAA GHCN-Daily, station USW00014950, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.