The highest day temperature in May 2025 was 81°F. The lowest night temperature was 60°F. The average values for day and night temperatures during May were 76.8°F и 62.5°F respectivly.

The average sea surface temperature in May 2025 for San Jose was 89.8°F. The maximum and minimum values were 89.0°F and 90.8°F respectively.

Most of the days in May are cloudy but you can also expect sunny or gloomy days.

Precipitation total in May for San Jose is 18.1 in. It makes may one of the most rainy months of the year.

The average wind speed in May is 3.1 mph. It makes May one of the most windless months of the year for San Jose.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for San Jose in May is 5.6 hours.