Loudoun County climate

Loudoun County Weather in May

NOAA 1991-2020 normals for Purcellville, 8.5 km from Loudoun County

Average highs run from 70°F on May 1 to 77°F on May 31, and lows from 47°F to 56°F. Normal precipitation for the month is 4.35 in.

May day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Loudoun County, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

May at a glance

Average high
73°F
Average low
52°F
Precipitation
4.35 in
Record high
96°FMay 18, 2026
Record low
28°FMay 4, 1986
Chance of a freeze
18%
Days of 90°F or more
1.2
Daylight
13 h 52 min to 14 h 43 min
Cloud cover
64%
Humidity
77%
Dew point
55°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
May 170°F47°F87°F 201732°F 19960%
May 270°F48°F90°F 201031°F 19790%
May 370°F48°F90°F 201829°F 19860%
May 470°F48°F91°F 200128°F 19860%
May 570°F48°F93°F 200132°F 19970%
May 671°F49°F87°F 200035°F 19790%
May 771°F49°F89°F 198632°F 20010%
May 871°F49°F91°F 200029°F 19970%
May 971°F50°F91°F 200032°F 19810%
May 1072°F50°F90°F 200028°F 19830%
May 1172°F50°F88°F 197931°F 19830%
May 1272°F50°F90°F 201836°F 19830%
May 1372°F51°F88°F 199134°F 19940%
May 1472°F51°F92°F 200031°F 19960%
May 1573°F51°F88°F 199134°F 20010%
May 1673°F52°F88°F 202534°F 20000%
May 1773°F52°F91°F 199830°F 19840%
May 1873°F52°F96°F 202638°F 19830%
May 1974°F52°F95°F 202636°F 20020%
May 2074°F53°F95°F 202632°F 20020%
May 2174°F53°F95°F 199631°F 19920%
May 2274°F53°F93°F 199629°F 20020%
May 2374°F54°F91°F 202134°F 20020%
May 2475°F54°F90°F 200437°F 20020%
May 2575°F54°F87°F 200040°F 19830%
May 2675°F55°F92°F 199140°F 19880%
May 2776°F55°F92°F 201141°F 19880%
May 2876°F55°F91°F 201035°F 19940%
May 2976°F56°F91°F 201236°F 19970%
May 3076°F56°F94°F 199139°F 19960%
May 3177°F56°F94°F 199137°F 20000%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Loudoun County, in percent, and of at least 0.1 inch of snowfall.00.21102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (EDT).

May 1
sunrise 6:12 AM, sunset 8:04 PM
May 31
sunrise 5:47 AM, sunset 8:30 PM

Every day of May: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00444909 (Purcellville), public domain. Records: NOAA GHCN-Daily, station USC00448084, 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.