San José climate

San José Weather in August

NASA POWER reanalysis for the half-degree grid cell around San José, 1991-2020; a grid cell is an area average and can differ from a thermometer in town by several degrees

Average highs run from 28°C on August 1 to 28°C on August 31, and lows from 25°C to 25°C. Normal precipitation for the month is 240 mm over about 28 wet days.

August day by day

The normal high and low for each date, in °C.

Normal daily high and low temperature at San José, in °C, with the record for each date.222426283032151015202530
  • Normal low
  • Normal high
  • Reanalysis extreme high
  • Reanalysis extreme low

August at a glance

Average high
28°C
Average low
25°C
Precipitation
240 mm
Reanalysis high
30°CAug 6, 2015
Reanalysis low
23°CAug 5, 2000
Daylight
12 h 30 min to 12 h 17 min
Cloud cover
83%
Humidity
88%
Dew point
24°C
Wind
8.6 km/h

Every day of the month

A wet day has at least 1 mm of precipitation in the reanalysis.

DateNormal highNormal lowReanalysis highReanalysis lowChance wet
Aug 128°C25°C30°C 202023°C 199186%
Aug 228°C25°C30°C 201523°C 199186%
Aug 328°C25°C30°C 201524°C 199186%
Aug 428°C25°C29°C 201524°C 199986%
Aug 528°C25°C30°C 201523°C 200086%
Aug 628°C25°C30°C 201524°C 199686%
Aug 728°C25°C30°C 201724°C 199686%
Aug 828°C25°C30°C 201524°C 199687%
Aug 928°C25°C30°C 201924°C 199688%
Aug 1028°C25°C29°C 201923°C 201389%
Aug 1128°C25°C30°C 200323°C 199289%
Aug 1228°C25°C29°C 201524°C 199290%
Aug 1328°C25°C30°C 201524°C 201190%
Aug 1428°C25°C30°C 201724°C 199991%
Aug 1528°C25°C30°C 201324°C 199391%
Aug 1628°C25°C30°C 201824°C 201192%
Aug 1728°C25°C30°C 201723°C 199692%
Aug 1828°C25°C29°C 201124°C 199691%
Aug 1928°C25°C30°C 201523°C 199192%
Aug 2028°C25°C30°C 201524°C 200892%
Aug 2128°C25°C29°C 200024°C 199991%
Aug 2228°C25°C30°C 201924°C 199991%
Aug 2328°C25°C29°C 201224°C 199991%
Aug 2428°C25°C30°C 201424°C 201491%
Aug 2528°C25°C30°C 199724°C 199391%
Aug 2628°C25°C30°C 199724°C 200791%
Aug 2728°C25°C30°C 199724°C 199991%
Aug 2828°C25°C29°C 201524°C 200791%
Aug 2928°C25°C29°C 200624°C 201091%
Aug 3028°C25°C29°C 201424°C 199691%
Aug 3128°C25°C30°C 201824°C 200291%

Chance of rain

The chance of at least 1 mm of precipitation in the reanalysis on each date at San José, in percent.0204060801001102030
  • Chance of a wet day

Sunrise and sunset

Times for 2026, local time (EST).

August 1
sunrise 6:11 AM, sunset 6:41 PM
August 31
sunrise 6:11 AM, sunset 6:28 PM

Every day of August: sun and moon

Other months

Sources

Cloud, humidity, wind and sunshine, and temperature and precipitation: 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 2026-09-28. Sun and moon: computed with the NOAA solar equations and Meeus.