Waterloo climate

Waterloo Weather in August

NOAA 1991-2020 normals for Franklin Wwtp, 17 km from Waterloo

Average highs run from 84°F on August 1 to 82°F on August 31, and lows from 63°F to 59°F. Normal precipitation for the month is 3.31 in over about 7 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.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
83°F
Average low
61°F
Precipitation
3.31 in
Record high
100°FAug 16, 1988
Record low
45°FAug 28, 1986
Chance of a freeze
0%
Days of 90°F or more
5.4
Daylight
14 h 13 min to 13 h 05 min
Cloud cover
49%
Humidity
72%
Dew point
63°F
Wind
6.0 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 184°F63°F96°F 199951°F 197127%0%
Aug 284°F63°F96°F 199154°F 201327%0%
Aug 384°F63°F95°F 196450°F 196527%0%
Aug 484°F63°F98°F 196454°F 197627%0%
Aug 584°F62°F96°F 201047°F 199426%0%
Aug 683°F62°F97°F 195648°F 199726%0%
Aug 783°F62°F93°F 195548°F 200426%0%
Aug 883°F62°F97°F 198749°F 198926%0%
Aug 983°F62°F96°F 200748°F 199426%0%
Aug 1083°F62°F95°F 198052°F 197225%0%
Aug 1183°F62°F95°F 198052°F 196725%0%
Aug 1283°F62°F92°F 199546°F 200425%0%
Aug 1383°F62°F94°F 200750°F 196425%0%
Aug 1483°F62°F93°F 201047°F 196725%0%
Aug 1583°F61°F96°F 198850°F 196324%0%
Aug 1683°F61°F100°F 198848°F 200424%0%
Aug 1783°F61°F98°F 198851°F 199224%0%
Aug 1883°F61°F97°F 198850°F 196324%0%
Aug 1983°F61°F98°F 198851°F 195324%0%
Aug 2083°F61°F98°F 198353°F 198523%0%
Aug 2183°F61°F100°F 198352°F 200123%0%
Aug 2283°F61°F97°F 198351°F 199723%0%
Aug 2383°F60°F93°F 200747°F 199723%0%
Aug 2483°F60°F94°F 195449°F 200923%0%
Aug 2583°F60°F94°F 195952°F 196623%0%
Aug 2683°F60°F94°F 198350°F 195822%0%
Aug 2782°F60°F92°F 195349°F 201022%0%
Aug 2882°F60°F94°F 195345°F 198622%0%
Aug 2982°F59°F96°F 195345°F 196522%0%
Aug 3082°F59°F97°F 195345°F 198622%0%
Aug 3182°F59°F94°F 195345°F 198622%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.01020301102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (EDT).

August 1
sunrise 6:44 AM, sunset 8:57 PM
August 31
sunrise 7:12 AM, sunset 8:17 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00123091 (Franklin Wwtp), public domain. Records: NOAA GHCN-Daily, station USC00124272, 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.