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May Weather in Mountain View, United States

Last updated: June 24, 2025

In May, the average temperature in Mountain View, United States hovers around 21°C (70°F), creating a pleasant climate. However, prepare for a range of temperatures, with minimums plummeting to 4°C (40°F) and maximums soaring to 38°C (101°F). Expect precipitation of around 141 mm (5.6 in) spread over 11 days, combined with an average humidity of 82%. Embrace the variety this month has to offer!

May Temperature in Mountain View

In May in Mountain View, the average temperature is 21°C (70°F). Maximums can reach 38°C (101°F), and minimums can drop as low as 4°C (40°F). Be prepared for a wide range of temperatures if you're planning to travel during this time.

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 21°C (70°F), with highs reaching up to 38°C (101°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec394154607080838275625044
Data source: Temperature data for Mountain View generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Mountain View

In Mountain View in May, the total precipitation amount is 141 mm (5.6 in) spread over 11 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 141 mm (5.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec3931659414163374478812129
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Mountain View

In Mountain View in May, humidity is 82%. With an average temperature of 21°C (70°F), this humidity feels like a warm, sticky embrace that can quickly lead to discomfort for travelers, making outdoor activities less enjoyable and requiring frequent breaks for hydration.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%76%70%72%82%82%80%72%64%71%81%84%
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.
JanFebMarAprMayJunJulAugSepOctNovDec46810111112119754
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.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)39 mm (1.5 inches)76%moderate
February Weather5°C (41°F)31 mm (1.2 inches)76%high
March Weather12°C (54°F)65 mm (2.6 inches)70%very high
April Weather16°C (60°F)94 mm (3.7 inches)72%very high
May Weather21°C (70°F)141 mm (5.6 inches)82%extreme
June Weather26°C (80°F)63 mm (2.5 inches)82%extreme
July Weather29°C (84°F)37 mm (1.5 inches)80%extreme
August Weather28°C (82°F)44 mm (1.7 inches)72%extreme
September Weather24°C (75°F)78 mm (3.1 inches)64%very high
October Weather17°C (62°F)81 mm (3.2 inches)71%high
November Weather10°C (50°F)21 mm (0.8 inches)81%moderate
December Weather7°C (44°F)29 mm (1.1 inches)84%moderate

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