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May Weather in Walnut Creek, United States

Last updated: June 24, 2025

In May, the average temperature in Walnut Creek, United States is a pleasant 17°C (63°F). However, temperatures can swing between a chilly 6°C (43°F) and a scorching 36°C (98°F). Expect a modest precipitation amount of 16 mm (0.6 in) over just 2 days, with an average humidity level of 71% ensuring a balanced environment.

May Temperature in Walnut Creek

In May in Walnut Creek, the average temperature is 17°C (63°F). Maximum temperatures can reach 36°C (98°F), while the minimum can drop to as low as 6°C (43°F). This makes it a great time for travelers to experience a variety of outdoor activities, from warm sunny days to cooler evenings.

May Weather in Walnut Creek: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Walnut Creek, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Walnut Creek, May typically has an average temperature of 17°C (63°F), with highs reaching up to 36°C (98°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec505255596368686968645650
Data source: Temperature data for Walnut Creek 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 Walnut Creek

In Walnut Creek in May, the precipitation amount is 16 mm (0.6 in) over a period of 2 days.

May Precipitation Trends in Walnut Creek

The chart displays monthly precipitation patterns in Walnut Creek, 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 Walnut Creek, May typically receives around 16 mm (0.6 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec99897231161001233775
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Walnut Creek

In Walnut Creek in May, humidity is 71%. With an average temperature of 17°C (63°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet a bit sticky, so travelers should stay hydrated and take breaks in the shade.

May Average Humidity in Walnut Creek

This chart illustrates the average monthly humidity levels in Walnut Creek, 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 Walnut Creek 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 Walnut Creek

In Walnut Creek in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Walnut Creek.

Maximum UV Index Levels in Walnut Creek for May

The chart shows the monthly maximum UV Index (UVI) for Walnut Creek 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 Walnut Creek typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589101111109643
Data source: Walnut Creek 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 Walnut Creek Compares to Other Months

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

This table compares monthly weather conditions in Walnut Creek, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)99 mm (3.9 inches)82%moderate
February Weather11°C (53°F)89 mm (3.5 inches)84%moderate
March Weather13°C (55°F)72 mm (2.8 inches)82%very high
April Weather15°C (59°F)31 mm (1.2 inches)78%very high
May Weather17°C (63°F)16 mm (0.6 inches)71%very high
June Weather20°C (68°F)1 mm (0.1 inches)64%extreme
July Weather20°C (68°F)0 mm (0.0 inches)58%extreme
August Weather20°C (69°F)0 mm (0.0 inches)54%very high
September Weather20°C (69°F)1 mm (0.0 inches)55%very high
October Weather18°C (64°F)23 mm (0.9 inches)62%high
November Weather13°C (56°F)37 mm (1.5 inches)78%moderate
December Weather10°C (50°F)75 mm (2.9 inches)80%moderate

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