May Weather in Pomona, United States

Last updated: June 24, 2025

In May, the average temperature in Pomona, United States hovers around 19°C (66°F). However, temperatures can range from a chilly 3°C (38°F) to a warm 34°C (93°F). Visitors should also anticipate 202 mm (7.9 in) of precipitation spread over 15 days, contributing to a relatively high average humidity of 82%. Plan accordingly to enjoy your stay!

May Temperature in Pomona

In May in Pomona, the average temperature is 19°C (66°F). Maximums can reach 34°C (93°F), while minimums can dip to as low as 3°C (38°F). This variability makes Pomona a great destination for travelers who enjoy diverse weather experiences.

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 19°C (66°F), with highs reaching up to 34°C (93°F) and lows dropping to around 3°C (38°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 202 mm (7.9 in) and occurs over the course of 15 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 202 mm (7.9 inches) of precipitation spread over approximately 15 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 82%. With an average temperature of 19°C (66°F), this humidity feels like a warm blanket wrapping around you, making it slightly uncomfortable for traveling as you might find yourself constantly seeking shade or a cool breeze.

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 82%, 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	0°C (33°F)	53 mm (2.1 inches)	76%	moderate
February Weather	1°C (34°F)	35 mm (1.4 inches)	77%	high
March Weather	9°C (48°F)	95 mm (3.7 inches)	70%	high
April Weather	13°C (55°F)	94 mm (3.7 inches)	73%	very high
May Weather	19°C (66°F)	202 mm (7.9 inches)	82%	very high
June Weather	25°C (78°F)	111 mm (4.4 inches)	82%	extreme
July Weather	27°C (80°F)	105 mm (4.1 inches)	81%	extreme
August Weather	25°C (77°F)	121 mm (4.8 inches)	78%	very high
September Weather	22°C (72°F)	80 mm (3.1 inches)	71%	very high
October Weather	14°C (58°F)	118 mm (4.6 inches)	71%	high
November Weather	7°C (45°F)	38 mm (1.5 inches)	81%	moderate
December Weather	4°C (39°F)	32 mm (1.3 inches)	84%	moderate