Philadelphia climate

Philadelphia Weather in August

NOAA 1991-2020 normals for Watertown, 23.9 km from Philadelphia

Average highs run from 80°F on August 1 to 77°F on August 31, and lows from 62°F to 58°F. Normal precipitation for the month is 3.84 in over about 11 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 Philadelphia, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
79°F
Average low
61°F
Precipitation
3.84 in
Record high
97°FAug 4, 1988
Record low
36°FAug 24, 1940
Chance of a freeze
0%
Days of 90°F or more
1.1
Daylight
14 h 36 min to 13 h 16 min
Cloud cover
57%
Humidity
78%
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 180°F62°F95°F 193343°F 194736%0%
Aug 280°F62°F93°F 194444°F 195936%0%
Aug 380°F62°F93°F 198843°F 191836%0%
Aug 480°F62°F97°F 198844°F 191436%0%
Aug 580°F62°F96°F 201243°F 200736%0%
Aug 680°F62°F93°F 190042°F 196436%0%
Aug 780°F62°F94°F 191645°F 194836%0%
Aug 879°F62°F94°F 189646°F 189936%0%
Aug 979°F62°F93°F 191441°F 189936%0%
Aug 1079°F62°F96°F 200144°F 189436%0%
Aug 1179°F62°F95°F 194445°F 191336%0%
Aug 1279°F61°F93°F 189944°F 193036%0%
Aug 1379°F61°F91°F 191843°F 194136%0%
Aug 1479°F61°F92°F 189642°F 189936%0%
Aug 1579°F61°F97°F 200243°F 190636%0%
Aug 1679°F61°F93°F 197843°F 190236%0%
Aug 1779°F61°F93°F 189544°F 190236%0%
Aug 1879°F61°F94°F 192541°F 191836%0%
Aug 1979°F60°F94°F 189942°F 199836%0%
Aug 2079°F60°F93°F 191640°F 189536%0%
Aug 2178°F60°F97°F 191640°F 189436%0%
Aug 2278°F60°F97°F 191641°F 198836%0%
Aug 2378°F60°F91°F 191843°F 195236%0%
Aug 2478°F59°F87°F 189436°F 194036%0%
Aug 2578°F59°F93°F 190041°F 191335%0%
Aug 2678°F59°F91°F 190043°F 189435%0%
Aug 2778°F59°F91°F 194837°F 191535%0%
Aug 2878°F58°F93°F 194840°F 192535%0%
Aug 2977°F58°F92°F 194839°F 189435%0%
Aug 3077°F58°F92°F 192537°F 191235%0%
Aug 3177°F58°F93°F 195340°F 190936%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Philadelphia, 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 5:51 AM, sunset 8:27 PM
August 31
sunrise 6:25 AM, sunset 7:41 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00309000 (Watertown), public domain. Records: NOAA GHCN-Daily, station USC00309000, 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.