May Weather in Mountain View, United States

Last updated: June 24, 2025

In May, the average temperature in Mountain View, United States is 20°C (69°F), with a minimum of 5°C (41°F) and a maximum reaching 33°C (92°F). Expect about 174 mm (6.9 in) of precipitation over 15 days, accompanied by an average humidity of 83%.

May Temperature in Mountain View

In May in Mountain View, the average temperature is 20°C (69°F), with maximums reaching 33°C (92°F) and minimums dropping to as low as 5°C (41°F). This makes it an ideal time for travelers to experience a pleasant mix of warm days and cooler evenings.

May Weather in Mountain View: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Mountain View, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mountain View, May typically has an average temperature of 20°C (69°F), with highs reaching up to 33°C (92°F) and lows dropping to around 5°C (41°F).

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

May Precipitation in Mountain View

In Mountain View in May, the precipitation amount is 174 mm (6.9 in) over a period of 15 days.

May Precipitation Trends in Mountain View

The chart displays monthly precipitation patterns in Mountain View, 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 Mountain View, May typically receives around 174 mm (6.9 inches) of precipitation spread over approximately 15 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 Mountain View

In Mountain View in May, humidity is 83%. With an average temperature of 20°C (69°F), this humidity feels like a warm embrace, making every step slightly more laborious and the air thick with moisture, which can be quite stifling for traveling.

May Average Humidity in Mountain View

This chart illustrates the average monthly humidity levels in Mountain View, 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 Mountain View is approximately 83%, 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 Mountain View

In Mountain View in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Mountain View.

Maximum UV Index Levels in Mountain View for May

The chart shows the monthly maximum UV Index (UVI) for Mountain View 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 Mountain View typically reaches 11, which falls under the extreme exposure category.

Data source: Mountain View 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 Mountain View Compares to Other Months

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

This table compares monthly weather conditions in Mountain View, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	4°C (39°F)	78 mm (3.1 inches)	84%	moderate
February Weather	6°C (42°F)	131 mm (5.2 inches)	83%	high
March Weather	11°C (53°F)	137 mm (5.4 inches)	81%	very high
April Weather	15°C (59°F)	144 mm (5.7 inches)	81%	very high
May Weather	20°C (69°F)	174 mm (6.9 inches)	83%	extreme
June Weather	25°C (77°F)	100 mm (3.9 inches)	83%	extreme
July Weather	27°C (81°F)	89 mm (3.5 inches)	81%	extreme
August Weather	26°C (79°F)	116 mm (4.6 inches)	74%	very high
September Weather	23°C (75°F)	82 mm (3.2 inches)	71%	very high
October Weather	17°C (62°F)	103 mm (4.1 inches)	76%	high
November Weather	9°C (49°F)	77 mm (3.0 inches)	84%	moderate
December Weather	7°C (45°F)	97 mm (3.8 inches)	88%	moderate