Bristow climate

Bristow Weather in May

NOAA 1991-2020 normals for Manassas, 3.9 km from Bristow

Average highs run from 71°F on May 1 to 78°F on May 31, and lows from 49°F to 59°F.

May day by day

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

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

May at a glance

Average high
74°F
Average low
54°F
Record high
97°FMay 29, 1969
Record low
28°FMay 7, 1970
Chance of a freeze
4%
Days of 90°F or more
1.8
Daylight
13 h 49 min to 14 h 41 min
Cloud cover
62%
Humidity
76%
Dew point
55°F
Wind
5.1 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 171°F49°F90°F 201033°F 19960%
May 271°F49°F91°F 202434°F 19600%
May 371°F49°F92°F 196532°F 19630%
May 471°F50°F90°F 200131°F 19670%
May 572°F50°F88°F 198029°F 19760%
May 672°F50°F90°F 198636°F 19680%
May 772°F51°F90°F 198628°F 19700%
May 872°F51°F90°F 200029°F 19740%
May 972°F51°F91°F 196330°F 19760%
May 1073°F52°F90°F 196331°F 19660%
May 1173°F52°F90°F 199329°F 19660%
May 1273°F52°F90°F 201834°F 19690%
May 1373°F53°F92°F 200032°F 19760%
May 1474°F53°F89°F 201032°F 19960%
May 1574°F53°F90°F 196237°F 19840%
May 1674°F54°F90°F 199835°F 20000%
May 1774°F54°F93°F 196030°F 19840%
May 1875°F54°F95°F 202633°F 19730%
May 1975°F55°F96°F 202636°F 20020%
May 2075°F55°F95°F 202636°F 20020%
May 2175°F55°F92°F 199633°F 19920%
May 2276°F56°F91°F 202231°F 20020%
May 2376°F56°F92°F 196439°F 19710%
May 2476°F56°F90°F 196436°F 19630%
May 2577°F57°F92°F 199136°F 19670%
May 2677°F57°F92°F 200738°F 19670%
May 2777°F57°F92°F 196537°F 19720%
May 2877°F58°F90°F 199137°F 19940%
May 2978°F58°F97°F 196940°F 19970%
May 3078°F58°F95°F 198738°F 19960%
May 3178°F59°F94°F 199137°F 19840%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Bristow, 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 6:13 AM, sunset 8:02 PM
May 31
sunrise 5:48 AM, sunset 8:29 PM

Every day of May: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00445204 (Manassas), public domain. Records: NOAA GHCN-Daily, station USW00093738, 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.