May Weather in Hayward, United States

Last updated: June 24, 2025

In Hayward, United States, the average temperature in May is a comfortable 16°C (61°F), with fluctuations that can bring the minimum down to 5°C (40°F) and the maximum soaring up to 35°C (94°F). Expect a modest precipitation amount of 17 mm (0.7 in) over the course of 2 days. The average humidity sits at a pleasant 71%, making it an ideal time to explore the locale!

May Temperature in Hayward

In May in Hayward, the average temperature is 16°C (61°F). Maximum temperatures can reach 35°C (94°F), while minimums can drop as low as 5°C (40°F). Pack accordingly to enjoy a range of weather during your travels!

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

The chart illustrates May temperature patterns in Hayward, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hayward, May typically has an average temperature of 16°C (61°F), with highs reaching up to 35°C (94°F) and lows dropping to around 5°C (40°F).

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

May Precipitation in Hayward

In Hayward in May, the precipitation amount is 17 mm (0.7 in) over a span of 2 days.

May Precipitation Trends in Hayward

The chart displays monthly precipitation patterns in Hayward, 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 Hayward, May typically receives around 17 mm (0.7 inches) of precipitation spread over approximately 2 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 Hayward

In Hayward in May humidity is 71%. With an average temperature of 16°C (61°F), this humidity feels like walking through a warm, damp blanket, making travel slightly uncomfortable but still enjoyable for those who appreciate mild weather.

May Average Humidity in Hayward

This chart illustrates the average monthly humidity levels in Hayward, 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 Hayward is approximately 71%, 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 Hayward

In Hayward 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 Hayward.

Maximum UV Index Levels in Hayward for May

The chart shows the monthly maximum UV Index (UVI) for Hayward 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 Hayward typically reaches 10, which falls under the very high exposure category.

Data source: Hayward 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 Hayward Compares to Other Months

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

This table compares monthly weather conditions in Hayward, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	94 mm (3.7 inches)	82%	moderate
February Weather	11°C (52°F)	89 mm (3.5 inches)	84%	moderate
March Weather	12°C (54°F)	77 mm (3.0 inches)	82%	very high
April Weather	14°C (58°F)	30 mm (1.2 inches)	78%	very high
May Weather	16°C (61°F)	17 mm (0.7 inches)	71%	very high
June Weather	19°C (66°F)	2 mm (0.1 inches)	64%	extreme
July Weather	20°C (68°F)	0 mm (0.0 inches)	58%	extreme
August Weather	20°C (69°F)	0 mm (0.0 inches)	54%	very high
September Weather	20°C (68°F)	2 mm (0.1 inches)	55%	very high
October Weather	17°C (63°F)	22 mm (0.9 inches)	62%	high
November Weather	13°C (55°F)	38 mm (1.5 inches)	78%	moderate
December Weather	10°C (50°F)	76 mm (3.0 inches)	80%	moderate