Monrovia climate

Monrovia Weather in August

NOAA 1991-2020 normals for Martinsville 2 Sw, 19.6 km from Monrovia

Average highs run from 84°F on August 1 to 82°F on August 31, and lows from 62°F to 58°F. Normal precipitation for the month is 3.44 in over about 8 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 Monrovia, in °F, with the record for each date.406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
83°F
Average low
61°F
Precipitation
3.44 in
Record high
97°FAug 2, 2012
Record low
47°FAug 15, 2014
Chance of a freeze
0%
Days of 90°F or more
4.1
Daylight
14 h 14 min to 13 h 05 min
Cloud cover
50%
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°F62°F93°F 200659°F 200928%0%
Aug 284°F62°F97°F 201257°F 201328%0%
Aug 384°F62°F94°F 200257°F 202528%0%
Aug 484°F62°F96°F 201057°F 201328%0%
Aug 584°F62°F92°F 200754°F 202028%0%
Aug 684°F62°F93°F 200752°F 199728%0%
Aug 784°F61°F94°F 200754°F 200428%0%
Aug 884°F61°F96°F 201255°F 199727%0%
Aug 984°F61°F93°F 200757°F 201727%0%
Aug 1084°F61°F95°F 201058°F 202427%0%
Aug 1184°F61°F95°F 201055°F 200427%0%
Aug 1284°F61°F96°F 200749°F 200427%0%
Aug 1384°F61°F96°F 201053°F 200427%0%
Aug 1484°F61°F91°F 201050°F 201326%0%
Aug 1584°F61°F93°F 201047°F 201426%0%
Aug 1684°F61°F92°F 202552°F 200426%0%
Aug 1784°F61°F89°F 202554°F 200426%0%
Aug 1883°F61°F90°F 201954°F 201226%0%
Aug 1983°F60°F91°F 201057°F 200025%0%
Aug 2083°F60°F94°F 201056°F 199925%0%
Aug 2183°F60°F92°F 202354°F 201525%0%
Aug 2283°F60°F93°F 200753°F 202425%0%
Aug 2383°F60°F93°F 200753°F 202425%0%
Aug 2483°F60°F94°F 202155°F 200924%0%
Aug 2583°F60°F92°F 202453°F 201524%0%
Aug 2683°F59°F92°F 202453°F 201724%0%
Aug 2783°F59°F95°F 202451°F 202524%0%
Aug 2883°F59°F92°F 200756°F 201024%0%
Aug 2982°F59°F94°F 200754°F 202524%0%
Aug 3082°F59°F96°F 202450°F 202524%0%
Aug 3182°F58°F93°F 201351°F 200924%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Monrovia, 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 6:45 AM, sunset 8:59 PM
August 31
sunrise 7:13 AM, sunset 8:18 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00125407 (Martinsville 2 Sw), public domain. Records: NOAA GHCN-Daily, station USW00053842, 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.