May Weather in San Jose, United States

Last updated: June 24, 2025

In May, the average temperature in San Jose, United States hovers around 24°C (76°F), providing a comfortable climate for outdoor activities. However, be prepared for temperature fluctuations, as it can dip to a chilly 8°C (47°F) at night and soar up to a sweltering 38°C (101°F) during the day. Expect minimal rainfall, with an average precipitation of 3 mm (0.1 in) over just 1 day. The weather is complemented by an average humidity of 45%, making it a delightful time to explore the area!

May Temperature in San Jose

In May in San Jose, the average temperature is 24°C (76°F), with maximums reaching up to 38°C (101°F) and minimums dropping as low as 8°C (47°F). Be prepared for warm days and cool evenings, making it ideal for both outdoor activities and cozy nights.

May Weather in San Jose: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in San Jose, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Jose, May typically has an average temperature of 24°C (76°F), with highs reaching up to 38°C (101°F) and lows dropping to around 8°C (47°F).

Data source: Temperature data for San Jose generated using information from the Copernicus Climate Change Service.

May Precipitation in San Jose

In San Jose in May, the precipitation amount is 3 mm (0.1 in) over the course of 1 day.

May Precipitation Trends in San Jose

The chart displays monthly precipitation patterns in San Jose, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In San Jose, May typically receives around 3 mm (0.1 inches) of precipitation spread over approximately 1 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

May Humidity in San Jose

In San Jose in May, humidity is 45%. With an average temperature of 24°C (76°F), this humidity feels like a refreshing embrace that keeps you comfortable while exploring, making it perfect for leisurely strolls and outdoor adventures.

May Average Humidity in San Jose

This chart illustrates the average monthly humidity levels in San Jose, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in San Jose is approximately 45%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in San Jose

In San Jose in May, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in San Jose.

Maximum UV Index Levels in San Jose for May

The chart shows the monthly maximum UV Index (UVI) for San Jose in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in San Jose typically reaches 12, which falls under the extreme exposure category.

Data source: San Jose May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How May Weather in San Jose Compares to Other Months

Weather in San Jose varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in San Jose, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in San Jose, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	8°C (47°F)	23 mm (0.9 inches)	81%	moderate
February Weather	10°C (50°F)	32 mm (1.2 inches)	82%	high
March Weather	15°C (59°F)	16 mm (0.6 inches)	68%	very high
April Weather	20°C (68°F)	2 mm (0.1 inches)	55%	extreme
May Weather	24°C (76°F)	3 mm (0.1 inches)	45%	extreme
June Weather	30°C (86°F)	4 mm (0.2 inches)	37%	extreme
July Weather	30°C (86°F)	45 mm (1.8 inches)	43%	extreme
August Weather	29°C (85°F)	22 mm (0.9 inches)	53%	extreme
September Weather	26°C (79°F)	28 mm (1.1 inches)	66%	extreme
October Weather	20°C (68°F)	13 mm (0.5 inches)	72%	very high
November Weather	14°C (58°F)	20 mm (0.8 inches)	81%	high
December Weather	9°C (48°F)	25 mm (1.0 inches)	84%	moderate