Ames climate

Ames Weather in September

NOAA 1991-2020 normals for Ames Muni AP, 4.8 km from Ames

Average highs run from 80°F on September 1 to 71°F on September 30, and lows from 56°F to 45°F. Normal precipitation for the month is 3.31 in over about 10 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 Ames, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
76°F
Average low
51°F
Precipitation
3.31 in
Record high
98°FSep 1, 2000
Record low
29°FSep 22, 1974
Chance of a freeze
26%
Days of 90°F or more
1.8
Daylight
13 h 08 min to 11 h 47 min
Cloud cover
49%
Humidity
68%
Dew point
53°F
Wind
9.8 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 180°F56°F98°F 200043°F 196736%0%
Sep 280°F56°F97°F 200046°F 196736%0%
Sep 379°F56°F96°F 200037°F 197436%0%
Sep 479°F55°F94°F 201237°F 197435%0%
Sep 579°F55°F94°F 201238°F 197435%0%
Sep 679°F55°F93°F 202642°F 198835%0%
Sep 779°F54°F96°F 197839°F 198635%0%
Sep 878°F54°F95°F 197838°F 198635%0%
Sep 978°F53°F97°F 201342°F 196934%0%
Sep 1078°F53°F96°F 201339°F 197634%0%
Sep 1178°F53°F97°F 200043°F 197034%0%
Sep 1277°F52°F93°F 202136°F 197534%0%
Sep 1377°F52°F97°F 202534°F 197533%0%
Sep 1477°F52°F97°F 202537°F 199633%0%
Sep 1576°F51°F91°F 201734°F 201133%0%
Sep 1676°F51°F91°F 201738°F 198433%0%
Sep 1776°F50°F92°F 200037°F 198133%0%
Sep 1876°F50°F91°F 200037°F 197333%0%
Sep 1975°F50°F92°F 197231°F 199133%0%
Sep 2075°F49°F93°F 202230°F 199133%0%
Sep 2174°F49°F93°F 202233°F 198332%0%
Sep 2274°F49°F91°F 201729°F 197432%0%
Sep 2374°F48°F91°F 201730°F 198332%0%
Sep 2473°F48°F90°F 201729°F 198932%0%
Sep 2573°F47°F87°F 201735°F 197532%0%
Sep 2673°F47°F88°F 199831°F 198432%0%
Sep 2772°F47°F92°F 202134°F 197531%0%
Sep 2872°F46°F92°F 202133°F 196731%0%
Sep 2971°F46°F91°F 202329°F 198431%0%
Sep 3071°F45°F92°F 202329°F 197231%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Ames, in percent, and of at least 0.1 inch of snowfall.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

September 1
sunrise 6:40 AM, sunset 7:48 PM
September 30
sunrise 7:11 AM, sunset 6:58 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00094989 (Ames Muni AP), public domain. Records: NOAA GHCN-Daily, station USC00130200, 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.