Riley climate

Riley Weather in August

NOAA 1991-2020 normals for Manhattan, 24.3 km from Riley

Average highs run from 91°F on August 1 to 86°F on August 31, and lows from 69°F to 63°F. Normal precipitation for the month is 4.40 in over about 11 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 Riley, in °F, with the record for each date.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
89°F
Average low
66°F
Precipitation
4.40 in
Record high
115°FAug 19, 2023
Record low
45°FAug 12, 1964
Chance of a freeze
0%
Days of 90°F or more
16.3
Daylight
14 h 11 min to 13 h 04 min
Cloud cover
47%
Humidity
64%
Dew point
63°F
Wind
8.9 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 191°F69°F109°F 201157°F 200935%0%
Aug 291°F69°F109°F 201153°F 200935%0%
Aug 391°F69°F107°F 196456°F 202136%0%
Aug 491°F69°F107°F 200852°F 202036%0%
Aug 591°F69°F104°F 196356°F 201236%0%
Aug 691°F69°F108°F 200655°F 200536%0%
Aug 791°F68°F102°F 202251°F 200435%0%
Aug 890°F68°F107°F 200051°F 199735%0%
Aug 990°F68°F109°F 200653°F 202435%0%
Aug 1090°F68°F106°F 201058°F 201235%0%
Aug 1190°F68°F103°F 202350°F 200435%0%
Aug 1290°F68°F106°F 200045°F 196435%0%
Aug 1390°F67°F108°F 200050°F 200434%0%
Aug 1490°F67°F103°F 200747°F 200434%0%
Aug 1589°F67°F105°F 200754°F 200634%0%
Aug 1689°F67°F105°F 200056°F 200434%0%
Aug 1789°F66°F104°F 200348°F 201233%0%
Aug 1889°F66°F105°F 200351°F 201233%0%
Aug 1989°F66°F115°F 202348°F 200133%0%
Aug 2089°F66°F105°F 200347°F 201232%0%
Aug 2188°F66°F109°F 202348°F 200432%0%
Aug 2288°F65°F107°F 202350°F 200932%0%
Aug 2388°F65°F106°F 200050°F 196132%0%
Aug 2488°F65°F108°F 202349°F 201531%0%
Aug 2588°F64°F110°F 200051°F 201531%0%
Aug 2687°F64°F103°F 202150°F 202531%0%
Aug 2787°F64°F108°F 200050°F 202531%0%
Aug 2887°F64°F109°F 200051°F 200930%0%
Aug 2987°F63°F102°F 200050°F 200430%0%
Aug 3086°F63°F106°F 200046°F 200930%0%
Aug 3186°F63°F109°F 200046°F 200930%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Riley, 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).

August 1
sunrise 6:28 AM, sunset 8:39 PM
August 31
sunrise 6:55 AM, sunset 7:59 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00144972 (Manhattan), public domain. Records: NOAA GHCN-Daily, station USW00003936, 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.