May Weather in Walnut Creek, United States

Last updated: June 24, 2025

In Walnut Creek, United States, the average temperature in May hovers around 22°C (71°F), but be prepared for a range that can dip to a chilly 5°C (41°F) or soar to a scorching 37°C (99°F). During this month, you can expect 115 mm (4.5 in) of precipitation spread over about 10 days, with humidity levels averaging a high 81%.

May Temperature in Walnut Creek

In May in Walnut Creek, the average temperature is 22°C (71°F). The maximum can reach 37°C (99°F), while the minimum can drop as low as 5°C (41°F). This diverse range of temperatures makes Walnut Creek a great destination for travelers seeking both warm and cooler weather experiences.

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 22°C (71°F), with highs reaching up to 37°C (99°F) and lows dropping to around 5°C (41°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 115 mm (4.5 in) over a span of 10 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 115 mm (4.5 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

May Humidity in Walnut Creek

In Walnut Creek in May humidity is 81%. With an average temperature of 22°C (71°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making outdoor activities somewhat challenging but offering a tropical ambiance perfect for exploring shaded areas and enjoying refreshing drinks.

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 81%, 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	7°C (45°F)	88 mm (3.5 inches)	85%	moderate
February Weather	10°C (51°F)	85 mm (3.3 inches)	82%	high
March Weather	12°C (54°F)	72 mm (2.8 inches)	81%	very high
April Weather	17°C (63°F)	104 mm (4.1 inches)	80%	very high
May Weather	22°C (71°F)	115 mm (4.5 inches)	81%	extreme
June Weather	25°C (77°F)	139 mm (5.5 inches)	81%	extreme
July Weather	27°C (81°F)	127 mm (5.0 inches)	81%	extreme
August Weather	26°C (79°F)	159 mm (6.3 inches)	80%	very high
September Weather	24°C (75°F)	148 mm (5.8 inches)	79%	very high
October Weather	19°C (67°F)	65 mm (2.5 inches)	80%	very high
November Weather	12°C (53°F)	88 mm (3.5 inches)	85%	moderate
December Weather	9°C (49°F)	107 mm (4.2 inches)	86%	moderate