Merrimac climate

Merrimac Weather in August

NOAA 1991-2020 normals for Piedmont Rsch Stn, 24.8 km from Merrimac

Average highs run from 86°F on August 1 to 83°F on August 31, and lows from 67°F to 64°F. Normal precipitation for the month is 3.38 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 Merrimac, 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
65°F
Precipitation
3.38 in
Record high
101°FAug 17, 1997
Record low
48°FAug 30, 2025
Chance of a freeze
0%
Days of 90°F or more
7.0
Daylight
14 h 08 min to 13 h 03 min
Cloud cover
55%
Humidity
69%
Dew point
62°F
Wind
3.4 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 186°F67°F96°F 199957°F 199734%0%
Aug 286°F67°F95°F 200254°F 199834%0%
Aug 386°F67°F96°F 200255°F 199834%0%
Aug 486°F67°F99°F 200256°F 199834%0%
Aug 586°F66°F95°F 200555°F 202133%0%
Aug 686°F66°F95°F 200255°F 199733%0%
Aug 786°F66°F93°F 200751°F 200433%0%
Aug 886°F66°F95°F 200052°F 200433%0%
Aug 985°F66°F100°F 200753°F 200232%0%
Aug 1085°F66°F94°F 200154°F 199932%0%
Aug 1185°F66°F94°F 200154°F 200232%0%
Aug 1285°F66°F98°F 199954°F 200832%0%
Aug 1385°F66°F98°F 201653°F 200631%0%
Aug 1485°F66°F99°F 201653°F 200631%0%
Aug 1585°F66°F97°F 201651°F 201331%0%
Aug 1685°F66°F99°F 199751°F 201330%0%
Aug 1785°F66°F101°F 199751°F 201330%0%
Aug 1885°F65°F98°F 199955°F 200830%0%
Aug 1985°F65°F95°F 200256°F 200829%0%
Aug 2085°F65°F94°F 200250°F 199829%0%
Aug 2185°F65°F93°F 201953°F 200029%0%
Aug 2285°F65°F92°F 199849°F 202428%0%
Aug 2384°F65°F95°F 199849°F 202428%0%
Aug 2484°F65°F100°F 200252°F 201128%0%
Aug 2584°F65°F96°F 199854°F 201128%0%
Aug 2684°F64°F96°F 202353°F 202527%0%
Aug 2784°F64°F95°F 201650°F 202527%0%
Aug 2884°F64°F93°F 199850°F 202527%0%
Aug 2983°F64°F95°F 201852°F 202527%0%
Aug 3083°F64°F96°F 201848°F 202527%0%
Aug 3183°F64°F93°F 199852°F 199927%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Merrimac, 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 6:14 AM, sunset 8:22 PM
August 31
sunrise 6:41 AM, sunset 7:44 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00446712 (Piedmont Rsch Stn), public domain. Records: NOAA GHCN-Daily, station USC00447985, 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.