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 23°C (74°F), with daily extremes ranging from a refreshing 7°C (45°F) to a sweltering 39°C (102°F). Rain is minimal, with an average precipitation amount of just 7 mm (0.3 in) over 1 day, and the average humidity sits comfortably at 45%. 🌞

May Temperature in Walnut Creek

In May in Walnut Creek, the average temperature is 23°C (74°F). Maximum temperatures can reach 39°C (102°F), while the minimum can be as low as 7°C (45°F). Be prepared for a wide range of temperatures when traveling during this month!

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 23°C (74°F), with highs reaching up to 39°C (102°F) and lows dropping to around 7°C (45°F).

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

May Precipitation in Walnut Creek

In Walnut Creek in May, the precipitation amount is 7 mm (0.3 in) over the course of 1 day.

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 7 mm (0.3 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 Walnut Creek

In Walnut Creek in May, humidity is 45%. With an average temperature of 23°C (74°F), this humidity feels like a comfortable, refreshing breeze that makes exploring the area enjoyable, allowing travelers to soak in the sights without feeling weighed down by heat or moisture.

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 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 Walnut Creek

In Walnut Creek 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 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 11, which falls under the extreme exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	8°C (47°F)	28 mm (1.1 inches)	77%	moderate
February Weather	10°C (49°F)	29 mm (1.1 inches)	80%	high
March Weather	13°C (56°F)	36 mm (1.4 inches)	68%	very high
April Weather	19°C (67°F)	8 mm (0.3 inches)	58%	very high
May Weather	23°C (74°F)	7 mm (0.3 inches)	45%	extreme
June Weather	30°C (86°F)	1 mm (0.1 inches)	31%	extreme
July Weather	32°C (89°F)	32 mm (1.3 inches)	27%	extreme
August Weather	32°C (89°F)	14 mm (0.6 inches)	30%	extreme
September Weather	27°C (81°F)	15 mm (0.6 inches)	48%	very high
October Weather	19°C (67°F)	20 mm (0.8 inches)	59%	high
November Weather	14°C (57°F)	26 mm (1.0 inches)	70%	moderate
December Weather	8°C (47°F)	21 mm (0.8 inches)	77%	moderate