Monroe County climate

Monroe County Weather in August

NOAA 1991-2020 normals for Hannibal Locks & Dam, 19.7 km from Monroe County

Average highs run from 83°F on August 1 to 82°F on August 31, and lows from 62°F to 59°F. Normal precipitation for the month is 3.58 in over about 9 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 Monroe County, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
83°F
Average low
61°F
Precipitation
3.58 in
Record high
99°FAug 17, 1988
Record low
37°FAug 29, 1965
Chance of a freeze
0%
Days of 90°F or more
4.0
Daylight
14 h 14 min to 13 h 05 min
Cloud cover
57%
Humidity
67%
Dew point
60°F
Wind
3.1 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 183°F62°F94°F 197550°F 196432%0%
Aug 283°F62°F98°F 199145°F 197632%0%
Aug 383°F62°F96°F 199145°F 196531%0%
Aug 483°F62°F96°F 200547°F 196631%0%
Aug 583°F62°F96°F 201047°F 197231%0%
Aug 683°F62°F92°F 196546°F 199431%0%
Aug 783°F62°F93°F 200146°F 199731%0%
Aug 883°F62°F94°F 200146°F 198931%0%
Aug 983°F62°F97°F 200747°F 198930%0%
Aug 1083°F62°F98°F 201045°F 197230%0%
Aug 1183°F62°F95°F 201043°F 197230%0%
Aug 1283°F62°F97°F 200546°F 196730%0%
Aug 1383°F62°F97°F 200546°F 196730%0%
Aug 1483°F62°F94°F 198843°F 196429%0%
Aug 1583°F61°F95°F 196540°F 196429%0%
Aug 1683°F61°F96°F 196542°F 196429%0%
Aug 1783°F61°F99°F 198844°F 196429%0%
Aug 1883°F61°F98°F 198847°F 198129%0%
Aug 1983°F61°F93°F 198345°F 196429%0%
Aug 2083°F61°F98°F 198346°F 196428%0%
Aug 2183°F61°F97°F 198344°F 196928%0%
Aug 2283°F60°F95°F 198341°F 198228%0%
Aug 2383°F60°F95°F 196846°F 197328%0%
Aug 2483°F60°F95°F 200741°F 197128%0%
Aug 2582°F60°F98°F 198345°F 197728%0%
Aug 2682°F60°F93°F 198347°F 198227%0%
Aug 2782°F60°F94°F 199345°F 196827%0%
Aug 2882°F59°F94°F 197342°F 196827%0%
Aug 2982°F59°F94°F 199337°F 196527%0%
Aug 3082°F59°F95°F 199340°F 198627%0%
Aug 3182°F59°F94°F 201244°F 197627%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Monroe County, 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 (EDT).

August 1
sunrise 6:23 AM, sunset 8:37 PM
August 31
sunrise 6:52 AM, sunset 7:57 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00333500 (Hannibal Locks & Dam), public domain. Records: NOAA GHCN-Daily, station USC00331197, 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.