Climate Overview
The climate in Norman Y. Mineta San José International Airport is temperate. The average annual temperature is 15°C and approximately 542mm of precipitation falls per year. January is the wettest month, receiving around 137mm of rainfall. Norman Y. Mineta San José International Airport is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, September, July. The coldest months are December, February, January, when temperatures can drop to 6°C.
Temperature
Temperatures in Norman Y. Mineta San José International Airport vary considerably across the year, with a 21°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 27°C and the mean temperature sits around 20°C. December is the coolest month, with minimum temperatures around 6°C and an average of 10°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 4°C shift in average temperatures.
Precipitation
Norman Y. Mineta San José International Airport is a relatively dry area, receiving approximately 542mm of precipitation annually, which averages out to around 45mm per month. The wettest month is January, averaging 137mm of rainfall. March and February also tend to see above-average precipitation. The driest month is July, with just 0mm. That's 137mm less than January, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.
Wind
Norman Y. Mineta San José International Airport is relatively calm, with an average annual wind speed of 2km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is May, averaging 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 0km/h gap between the calmest and windiest months.
Seasons
4 days until Summer
It is currently spring in Norman Y. Mineta San José International Airport, which began on March 20, 2026. Norman Y. Mineta San José International Airport is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 27°C, while the coldest stretch bottoms out in December near 6°C. Summer is next, beginning on June 21, 2026 — 4 days from now.
Spring
Temperatures range from 9 to 22°C. Precipitation is moderate at around 172mm for the season, averaging 57mm per month. Winds are generally light, averaging 2km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 13 to 27°C. Precipitation is minimal, with only around 2mm for the entire season. Winds are generally light, averaging 2km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from 9 to 27°C. Rainfall is relatively light, with around 73mm over the season and a monthly average of 24mm. Winds are generally light, averaging 2km/h. Layered clothing works best as temperatures gradually cool — enjoy the crisp air and changing scenery.
Winter
Temperatures range from 6 to 16°C. Precipitation is moderate at around 295mm for the season, averaging 98mm per month. Winds are generally light, averaging 2km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Best Time to Visit
The best time to visit Norman Y. Mineta San José International Airport is during May, June, July, August, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 9mm per month. By contrast, December can be quite cold with temperatures dropping to 6°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.
Monthly Climate Data
The table below shows monthly climate averages for Norman Y. Mineta San José International Airport based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
