Onawa climate

Onawa Weather in September

NOAA 1991-2020 normals for Onawa 3NW, 5.3 km from Onawa

Average highs run from 82°F on September 1 to 73°F on September 30, and lows from 56°F to 44°F. Normal precipitation for the month is 2.97 in over about 6 wet days.

September day by day

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

Normal daily high and low temperature at Onawa, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
78°F
Average low
50°F
Precipitation
2.97 in
Record high
106°FSep 2, 2000
Record low
28°FSep 30, 2003
Chance of a freeze
41%
Days of 90°F or more
2.9
Daylight
13 h 08 min to 11 h 47 min
Cloud cover
48%
Humidity
65%
Dew point
52°F
Wind
10.7 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
Sep 182°F56°F94°F 201244°F 200922%0%
Sep 282°F55°F106°F 200045°F 202422%0%
Sep 381°F55°F99°F 200042°F 200621%0%
Sep 481°F55°F99°F 201242°F 201021%0%
Sep 581°F54°F95°F 202045°F 201121%0%
Sep 681°F54°F98°F 202042°F 202521%0%
Sep 781°F54°F93°F 200241°F 200821%0%
Sep 880°F53°F94°F 202241°F 201221%0%
Sep 980°F53°F96°F 200039°F 200821%0%
Sep 1080°F53°F97°F 200039°F 199921%0%
Sep 1180°F52°F99°F 201243°F 202221%0%
Sep 1279°F52°F93°F 199840°F 201421%0%
Sep 1379°F51°F97°F 202536°F 201421%0%
Sep 1479°F51°F93°F 201835°F 200721%0%
Sep 1579°F51°F92°F 201833°F 200721%0%
Sep 1678°F50°F92°F 202140°F 199921%0%
Sep 1778°F50°F95°F 200043°F 199921%0%
Sep 1878°F50°F95°F 200034°F 201221%0%
Sep 1977°F49°F95°F 199837°F 200321%0%
Sep 2077°F49°F102°F 202233°F 200621%0%
Sep 2177°F48°F99°F 200531°F 199921%0%
Sep 2276°F48°F95°F 201732°F 201221%0%
Sep 2376°F47°F91°F 201731°F 201221%0%
Sep 2476°F47°F90°F 201731°F 200220%0%
Sep 2575°F47°F94°F 199832°F 200320%0%
Sep 2675°F46°F95°F 199833°F 200120%0%
Sep 2775°F46°F94°F 202134°F 201220%0%
Sep 2874°F45°F94°F 202132°F 200320%0%
Sep 2974°F45°F98°F 202329°F 200319%0%
Sep 3073°F44°F98°F 202328°F 200319%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Onawa, in percent, and of at least 0.1 inch of snowfall.05101520251102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

September 1
sunrise 6:50 AM, sunset 7:58 PM
September 30
sunrise 7:20 AM, sunset 7:07 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00136243 (Onawa 3NW), public domain. Records: NOAA GHCN-Daily, station USW00094978, 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.