May Weather in Pomona, United States

Last updated: June 24, 2025

In May, the average temperature in Pomona, United States is a pleasant 18°C (64°F). Expect a range of 6°C (44°F) on the cooler side to a warm 33°C (91°F) at its peak. The region sees about 17 mm (0.7 in) of precipitation over 3 days, and boasts an average humidity of 70%, creating a comfortable yet humid atmosphere.

May Temperature in Pomona

In May in Pomona, the average temperature is 18°C (64°F), with maximums reaching 33°C (91°F) and minimums dropping as low as 6°C (44°F). This varied weather makes it a great time to enjoy both warm and cool activities while exploring the area.

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

The chart illustrates May temperature patterns in Pomona, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pomona, May typically has an average temperature of 18°C (64°F), with highs reaching up to 33°C (91°F) and lows dropping to around 6°C (44°F).

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

May Precipitation in Pomona

In Pomona in May, the precipitation amount is 17 mm (0.7 in) over the course of 3 days.

May Precipitation Trends in Pomona

The chart displays monthly precipitation patterns in Pomona, 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 Pomona, May typically receives around 17 mm (0.7 inches) of precipitation spread over approximately 3 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 Pomona

In Pomona in May humidity is 70%. With an average temperature of 18°C (64°F), this humidity feels like a sticky embrace, making outdoor excursions a bit more cumbersome and requiring frequent breaks to stay refreshed and hydrated.

May Average Humidity in Pomona

This chart illustrates the average monthly humidity levels in Pomona, 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 Pomona is approximately 70%, 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 Pomona

In Pomona 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 Pomona.

Maximum UV Index Levels in Pomona for May

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

Data source: Pomona 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 Pomona Compares to Other Months

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

This table compares monthly weather conditions in Pomona, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (54°F)	80 mm (3.1 inches)	74%	moderate
February Weather	12°C (55°F)	70 mm (2.8 inches)	79%	high
March Weather	14°C (57°F)	76 mm (3.0 inches)	75%	very high
April Weather	16°C (62°F)	27 mm (1.1 inches)	70%	very high
May Weather	18°C (64°F)	17 mm (0.7 inches)	70%	very high
June Weather	21°C (70°F)	1 mm (0.0 inches)	72%	extreme
July Weather	24°C (76°F)	1 mm (0.1 inches)	73%	extreme
August Weather	25°C (77°F)	2 mm (0.1 inches)	69%	very high
September Weather	23°C (74°F)	3 mm (0.1 inches)	68%	very high
October Weather	20°C (68°F)	12 mm (0.5 inches)	67%	high
November Weather	16°C (61°F)	26 mm (1.0 inches)	68%	moderate
December Weather	12°C (54°F)	79 mm (3.1 inches)	71%	moderate