Roy climate

Roy Weather in August

NOAA 1991-2020 normals for Mcmillin Rsvr, 26 km from Roy

Average highs run from 78°F on August 1 to 74°F on August 31, and lows from 54°F to 51°F. Normal precipitation for the month is 0.90 in over about 5 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 Roy, in °F, with the record for each date.405060708090100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
77°F
Average low
53°F
Precipitation
0.90 in
Record high
94°FAug 16, 2020
Record low
47°FAug 13, 2020
Chance of a freeze
0%
Days of 90°F or more
0.8
Daylight
14 h 52 min to 13 h 22 min
Cloud cover
48%
Humidity
75%
Dew point
54°F
Wind
3.6 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 178°F54°F89°F 201550°F 200113%0%
Aug 278°F54°F90°F 200951°F 201213%0%
Aug 378°F54°F90°F 201750°F 200613%0%
Aug 478°F54°F90°F 201451°F 200314%0%
Aug 578°F54°F92°F 201250°F 200214%0%
Aug 678°F54°F86°F 201352°F 201614%0%
Aug 778°F53°F87°F 202254°F 200214%0%
Aug 878°F53°F90°F 201851°F 200114%0%
Aug 978°F53°F91°F 200450°F 202014%0%
Aug 1078°F53°F89°F 200153°F 200714%0%
Aug 1177°F53°F86°F 202151°F 200714%0%
Aug 1277°F53°F91°F 202549°F 200614%0%
Aug 1377°F53°F90°F 200247°F 202015%0%
Aug 1477°F53°F91°F 201050°F 200015%0%
Aug 1577°F53°F93°F 202350°F 200915%0%
Aug 1677°F53°F94°F 202050°F 200015%0%
Aug 1777°F53°F90°F 201250°F 200015%0%
Aug 1877°F53°F89°F 202251°F 201816%0%
Aug 1976°F53°F91°F 201650°F 202316%0%
Aug 2076°F52°F90°F 201648°F 201016%0%
Aug 2176°F52°F87°F 201850°F 201017%0%
Aug 2276°F52°F88°F 201850°F 202117%0%
Aug 2376°F52°F88°F 202548°F 202018%0%
Aug 2475°F52°F88°F 202548°F 202118%0%
Aug 2575°F52°F88°F 202548°F 202118%0%
Aug 2675°F52°F90°F 201650°F 201719%0%
Aug 2775°F52°F87°F 202550°F 202019%0%
Aug 2875°F51°F87°F 200247°F 201020%0%
Aug 2974°F51°F83°F 200751°F 200020%0%
Aug 3074°F51°F86°F 202247°F 202020%0%
Aug 3174°F51°F84°F 202248°F 200821%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Roy, in percent, and of at least 0.1 inch of snowfall.05101520251102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (PDT).

August 1
sunrise 5:50 AM, sunset 8:42 PM
August 31
sunrise 6:29 AM, sunset 7:51 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00455224 (Mcmillin Rsvr), public domain. Records: NOAA GHCN-Daily, station USW00094274, 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.