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May Weather in Sunnyvale, United States

Last updated: June 24, 2025

In Sunnyvale, United States, the average temperature in May hovers around 15°C (59°F), with minimums dipping to 5°C (40°F) and maximums reaching up to 32°C (90°F). Expect 24 mm (0.9 in) of precipitation, typically spread over 2 days. The air tends to be quite humid, with an average humidity level of 71%.

May Temperature in Sunnyvale

In May in Sunnyvale, the average temperature is 15°C (59°F). Maximum temperatures can reach 32°C (90°F), while minimums can drop to as low as 5°C (40°F). This makes Sunnyvale a great destination for travelers seeking a variety of weather experiences.

May Weather in Sunnyvale: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Sunnyvale, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sunnyvale, May typically has an average temperature of 15°C (59°F), with highs reaching up to 32°C (90°F) and lows dropping to around 5°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec505153565964666766635550
Data source: Temperature data for Sunnyvale 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 Sunnyvale

In Sunnyvale in May, the total precipitation amount is 24 mm (0.9 in) over a period of 2 days.

May Precipitation Trends in Sunnyvale

The chart displays monthly precipitation patterns in Sunnyvale, 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 Sunnyvale, May typically receives around 24 mm (0.9 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec145133114372410132556116
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Sunnyvale

In Sunnyvale in May humidity is 71%. With an average temperature of 15°C (59°F), this humidity feels like a damp embrace, making outdoor activities slightly uncomfortable and encouraging travelers to seek shade or indoor attractions to escape the muggy air.

May Average Humidity in Sunnyvale

This chart illustrates the average monthly humidity levels in Sunnyvale, 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 Sunnyvale is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%82%78%71%64%59%54%55%62%78%80%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Sunnyvale

In Sunnyvale 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 Sunnyvale.

Maximum UV Index Levels in Sunnyvale for May

The chart shows the monthly maximum UV Index (UVI) for Sunnyvale 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 Sunnyvale typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4589111111109753
Data source: Sunnyvale 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 Sunnyvale Compares to Other Months

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

This table compares monthly weather conditions in Sunnyvale, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (51°F)145 mm (5.7 inches)82%moderate
February Weather11°C (52°F)133 mm (5.2 inches)84%moderate
March Weather11°C (53°F)114 mm (4.5 inches)82%very high
April Weather13°C (56°F)37 mm (1.4 inches)78%very high
May Weather15°C (59°F)24 mm (0.9 inches)71%extreme
June Weather18°C (64°F)1 mm (0.0 inches)64%extreme
July Weather19°C (66°F)0 mm (0.0 inches)58%extreme
August Weather19°C (67°F)0 mm (0.0 inches)54%very high
September Weather19°C (67°F)3 mm (0.1 inches)55%very high
October Weather17°C (63°F)25 mm (1.0 inches)62%high
November Weather13°C (56°F)56 mm (2.2 inches)78%moderate
December Weather10°C (50°F)116 mm (4.6 inches)80%moderate

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