Weather in San Jose in August 2025
- August is usually the hottest month of the year in San Jose;
Average weather
Average temperature in San Jose in August
Going from a maximum of +97°F during the day to a minimum of +54°F during the night, the temperature in August averages around +90°F.
The average maximum temperature goes up 21% by the end of the month, compared with the beginning of the month, from +84°F to +93°F.
Is San Jose warm or cold in August?
San Jose is typically warm in August.
Maximum temperatures go up compared to the previous month from +82°F to +82°F. The minimum temperature also goes up from +59°F to +59°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
August is the hottest month in San Jose, here is the comparison with other months:
Climate in San Jose in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +82°F | +82°F | +81°F | ||||
| Min. temperature | ||||||
| +48°F | +50°F | +48°F | ||||
| Max. temperature | ||||||
| +106°F | +104°F | +109°F | ||||
| Rainfall | ||||||
| 29 mm | 10 mm | 6 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 64% | 66% | 64% | ||||
| Air pressure | ||||||
| 1013 HPa | 1013 HPa | 1012 HPa | ||||
| Sunny days | ||||||
| 17 | 15 | 14 | ||||
| Cloudy days | ||||||
| 13 | 15 | 14 | ||||
| Rainy days | ||||||
| 1 | 1 | 2 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August weather is still as great as in July. The temperature levels stay the same in the area of +82°F for average maximum temperature during the day. As August arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 29 mm to 10 mm. Humidity rises from 64% to 66%. The average wind speed doesn’t change much during August, staying around 2 m/s. The days becoming less sunny, going from 17 sunny days in July to 15 in August.
September brings much the same weather, it remains great.
Wind
The average wind speed is 7 m/s getting up to 15 m/s which is quite strong. The wind will cause branches to move and ground debris to fly around.
The average wind speed in San Jose is gradually increasing during August, going from 10 m/s to 15 m/s over the course of the month.
Rain
How was the weather last August in San Jose?
Climate Change Over the Years
The climate in San Jose in August has not changed that much over the last 43 years.
The average temperature was the lowest in 1982 (+67°F) and the highest in 2024 (+75°F). The driest year was 2013 with only 147 mm of rainfall, and the wettest year was 2020 with 4306 mm.
FAQ
Is August a good time to visit San Jose?
Can you sunbathe in San Jose in August?
Is San Jose rainy in August?
Is it sunny in San Jose in August?
Other cities in USA
Monthly weather in San Jose
Source of the data
For this page, we’ve looked at the typical weather in San Jose, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
