Waterloo climate

Waterloo Weather in August

NOAA 1991-2020 normals for Geneva Rsch Farm, 14 km from Waterloo

Average highs run from 79°F on August 1 to 76°F on August 31, and lows from 61°F to 56°F. Normal precipitation for the month is 3.49 in over about 12 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 Waterloo, in °F, with the record for each date.406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
78°F
Average low
59°F
Precipitation
3.49 in
Record high
97°FAug 8, 2001
Record low
43°FAug 31, 2006
Chance of a freeze
0%
Days of 90°F or more
1.1
Daylight
14 h 29 min to 13 h 13 min
Cloud cover
68%
Humidity
69%
Dew point
59°F
Wind
4.3 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 179°F61°F93°F 200249°F 202541%0%
Aug 279°F61°F95°F 200753°F 202341%0%
Aug 379°F61°F93°F 200754°F 202141%0%
Aug 479°F61°F94°F 200554°F 201941%0%
Aug 579°F60°F89°F 201652°F 201341%0%
Aug 679°F60°F93°F 200151°F 200441%0%
Aug 779°F60°F92°F 200153°F 200441%0%
Aug 879°F60°F97°F 200152°F 200241%0%
Aug 979°F60°F97°F 200151°F 199941%0%
Aug 1078°F60°F92°F 202054°F 200841%0%
Aug 1178°F60°F93°F 202050°F 200641%0%
Aug 1278°F60°F95°F 200250°F 200641%0%
Aug 1378°F60°F95°F 201651°F 202241%0%
Aug 1478°F60°F97°F 200250°F 202241%0%
Aug 1578°F59°F87°F 200951°F 200141%0%
Aug 1678°F59°F93°F 200252°F 199941%0%
Aug 1778°F59°F90°F 200249°F 200040%0%
Aug 1878°F59°F91°F 200249°F 201240%0%
Aug 1978°F59°F86°F 201646°F 199840%0%
Aug 2078°F59°F89°F 201645°F 200040%0%
Aug 2178°F59°F87°F 202044°F 200040%0%
Aug 2277°F58°F89°F 202050°F 200440%0%
Aug 2377°F58°F89°F 202051°F 201340%0%
Aug 2477°F58°F91°F 200749°F 200140%0%
Aug 2577°F58°F92°F 200748°F 201740%0%
Aug 2677°F58°F85°F 200549°F 200839%0%
Aug 2777°F57°F87°F 202049°F 200839%0%
Aug 2877°F57°F92°F 201649°F 201739%0%
Aug 2976°F57°F90°F 201847°F 201239%0%
Aug 3076°F57°F89°F 201048°F 199939%0%
Aug 3176°F56°F93°F 201243°F 200639%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Waterloo, in percent, and of at least 0.1 inch of snowfall.010203040501102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (EDT).

August 1
sunrise 5:59 AM, sunset 8:28 PM
August 31
sunrise 6:31 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 USC00303184 (Geneva Rsch Farm), public domain. Records: NOAA GHCN-Daily, station USW00054778, 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.