San Jose, CA weather in August
August in San Jose: warm and dry. Highs 81°F, lows 59°F, rain is rare. This is the peak of the warm season in San Jose. A great month for outdoor plans.
- Normal high
- 81°F
- Normal low
- 59°F
- Wet days
- 0
- 0.05 in total
- Muggy days
- 0
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 81°F | 82°F |
| Normal low | 59°F | 58°F |
| Chance of a wet day | 1% | 1% |
| Sunrise / sunset | 6:12 am / 8:15 pm | 6:37 am / 7:38 pm |
| Daylight | 14.1 h | 13.0 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
A typical August day
- 6 am58°Fdew point 54°F
- 9 am64°Fdew point 55°F
- Noon70°Fdew point 55°F
- 3 pm70°Fdew point 54°F
- 6 pm64°Fdew point 54°F
- 9 pm60°Fdew point 54°F
NOAA hourly normals (local standard time) from San Francisco Intl Airport (32 mi away); average wind 12 mph; clear or few clouds in 65% of daytime hours, mostly cloudy or overcast in 17%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F17 of 31
- Hot dayshigh 90°F or more3 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow0 of 31
- Notable rainat least 0.10 in0 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 0.05 in; a dry August brings about 0.0 in and a wet one about 0.01 in (25th and 75th percentiles). Days with half an inch or more are rare.
How August varies from year to year
- Warmest August, 1991-20202020: average high 85°F
- Coolest August1999: average high 78°F
- Wettest August1999: 0.06 in
- Driest August1998: no measurable precipitation
- Highest reading103°F (August 14, 2020)
- Lowest reading51°F (August 15, 1999)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
August compared with July and September
| July | August | September | |
|---|---|---|---|
| Normal high | 81°F | 81°F | 81°F |
| Normal low | 58°F | 59°F | 57°F |
| Wet days | 0 | 0 | 1 |
| Comfortable days | 16 | 17 | 17 |
| Daylight | 14.4 h | 13.6 h | 12.4 h |
Highs change by 0°F from July and 0°F into September.
Nearby alternatives in August
- Warmer: Tracy, CA38 mi · high 94°F · 0 wet days
- Cooler: Hayward, CA25 mi · high 73°F · 0 wet days
How San Jose ranks in August
- Normal high290th warmest of 378 cities; 43rd of 60 in California
- Wet days23rd driest of 378
- Comfortable days21st most of 341
Heating and cooling
August has 2 heating degree days and 157 cooling degree days (base 65°F), 6% of the year's total heating and cooling demand.
Questions
How hot is San Jose in August?
The normal high is 81°F and the normal low is 59°F. From 1991 to 2020 the hottest August reading was 103°F (August 14, 2020).
Does it rain a lot in San Jose in August?
About 0 days in August have at least 0.01 in of precipitation, and the normal total is 0.05 in. The wettest August in 1991-2020 was in 1999 (0.06 in); the driest was in 1998, with no measurable precipitation.
Is August a good time to visit San Jose?
August ranks 6th of 12 months on our comfort score for San Jose (76 out of 100). It has about 17 comfortable days and about 3 days at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, rain and frost dates: San Jose (USW00023293), 2.1 mi NW of the city center, 51 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: San Jose (USC00047821), 0.8 mi NNW of the city center, 67 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: San Francisco Intl Airport (USW00023234), 32 mi NW of the city center, 8 ft (73 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: N Y. Mineta Sn Jo Intl Apt (724945-23293), 2.1 mi NW of the city center, 49 ft . Hourly observations, 1991-2020.