Johnston climate

Johnston Weather in August

NOAA 1991-2020 normals for Johnston 4 Sw, 7.4 km from Johnston

Average highs run from 92°F on August 1 to 89°F on August 31, and lows from 69°F to 66°F. Normal precipitation for the month is 4.96 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 Johnston, in °F, with the record for each date.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
91°F
Average low
68°F
Precipitation
4.96 in
Record high
109°FAug 22, 1983
Record low
52°FAug 30, 1982
Chance of a freeze
0%
Days of 90°F or more
19.5
Daylight
13 h 49 min to 12 h 54 min
Cloud cover
57%
Humidity
70%
Dew point
68°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 192°F69°F105°F 199956°F 199737%0%
Aug 292°F69°F104°F 198656°F 199737%0%
Aug 392°F69°F102°F 198062°F 190237%0%
Aug 492°F69°F105°F 195455°F 191237%0%
Aug 592°F69°F103°F 195455°F 191237%0%
Aug 692°F69°F102°F 195655°F 199837%0%
Aug 792°F69°F107°F 190557°F 200437%0%
Aug 892°F69°F102°F 199954°F 200237%0%
Aug 992°F69°F102°F 199955°F 200237%0%
Aug 1092°F69°F105°F 200757°F 200236%0%
Aug 1191°F69°F106°F 200756°F 200236%0%
Aug 1291°F69°F102°F 199959°F 190236%0%
Aug 1391°F68°F105°F 192560°F 190236%0%
Aug 1491°F68°F103°F 192556°F 198336%0%
Aug 1591°F68°F101°F 199555°F 198335%0%
Aug 1691°F68°F104°F 195457°F 198335%0%
Aug 1791°F68°F103°F 195458°F 197935%0%
Aug 1891°F68°F104°F 200059°F 190234%0%
Aug 1991°F68°F102°F 198359°F 198934%0%
Aug 2090°F68°F105°F 192560°F 194334%0%
Aug 2190°F68°F107°F 198356°F 199833%0%
Aug 2290°F67°F109°F 198355°F 199833%0%
Aug 2390°F67°F106°F 198355°F 193032%0%
Aug 2490°F67°F102°F 200254°F 196932%0%
Aug 2590°F67°F100°F 194354°F 199732%0%
Aug 2690°F67°F102°F 194356°F 196931%0%
Aug 2790°F67°F103°F 195455°F 198131%0%
Aug 2889°F67°F101°F 199856°F 190431%0%
Aug 2989°F66°F101°F 198754°F 196831%0%
Aug 3089°F66°F103°F 198752°F 198230%0%
Aug 3189°F66°F99°F 199353°F 198630%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Johnston, 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 6:39 AM, sunset 8:28 PM
August 31
sunrise 7:00 AM, sunset 7:54 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00384607 (Johnston 4 Sw), public domain. Records: NOAA GHCN-Daily, station USC00380074, 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.