Rockville climate

Rockville Weather in August

NOAA 1991-2020 normals for Rockville, 0.4 km from Rockville

Average highs run from 85°F on August 1 to 83°F on August 31, and lows from 61°F to 58°F. Normal precipitation for the month is 3.84 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 Rockville, in °F, with the record for each date.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
85°F
Average low
60°F
Precipitation
3.84 in
Record high
100°FAug 2, 2012
Record low
43°FAug 12, 2004
Chance of a freeze
0%
Days of 90°F or more
7.2
Daylight
14 h 14 min to 13 h 06 min
Cloud cover
50%
Humidity
74%
Dew point
63°F
Wind
7.2 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 185°F61°F96°F 201255°F 202326%0%
Aug 285°F61°F100°F 201253°F 202126%0%
Aug 385°F61°F94°F 200256°F 200926%0%
Aug 485°F61°F99°F 201253°F 201326%0%
Aug 585°F61°F93°F 202452°F 201726%0%
Aug 685°F61°F94°F 202453°F 200426%0%
Aug 785°F61°F98°F 201248°F 200426%0%
Aug 885°F61°F100°F 201251°F 200425%0%
Aug 985°F61°F94°F 201052°F 201725%0%
Aug 1085°F61°F95°F 201055°F 199925%0%
Aug 1185°F61°F95°F 201050°F 200425%0%
Aug 1285°F61°F94°F 201043°F 200425%0%
Aug 1385°F61°F93°F 201050°F 200425%0%
Aug 1485°F60°F90°F 201046°F 200425%0%
Aug 1585°F60°F93°F 201046°F 200425%0%
Aug 1685°F60°F93°F 202546°F 200424%0%
Aug 1785°F60°F92°F 200051°F 200424%0%
Aug 1885°F60°F91°F 202552°F 202324%0%
Aug 1985°F60°F92°F 202552°F 200824%0%
Aug 2085°F60°F91°F 201051°F 201224%0%
Aug 2184°F60°F94°F 202349°F 201524%0%
Aug 2284°F60°F96°F 200747°F 202423%0%
Aug 2384°F59°F97°F 200750°F 202423%0%
Aug 2484°F59°F96°F 200751°F 200923%0%
Aug 2584°F59°F97°F 202347°F 201523%0%
Aug 2684°F59°F95°F 202446°F 202523%0%
Aug 2784°F59°F97°F 202448°F 201023%0%
Aug 2884°F58°F94°F 200751°F 201022%0%
Aug 2984°F58°F95°F 200753°F 202322%0%
Aug 3083°F58°F97°F 202450°F 200922%0%
Aug 3183°F58°F96°F 201350°F 200922%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Rockville, 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 6:48 AM, sunset 9:02 PM
August 31
sunrise 7:16 AM, sunset 8:22 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00127522 (Rockville), public domain. Records: NOAA GHCN-Daily, station USW00003868, 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.