May Weather in Upland, United States

Last updated: June 24, 2025

In Upland, United States, the average temperature in May hovers around 18°C (65°F). Expect a range from a cool 2°C (36°F) to a warm 34°C (94°F). During this month, you can anticipate approximately 135 mm (5.3 in) of precipitation over about 12 days, with an average humidity level of 78%. Be prepared for a mix of weather as you explore!

May Temperature in Upland

In May in Upland, the average temperature is 18°C (65°F). Maximums can reach 34°C (94°F), and minimums can be as low as 2°C (36°F). This makes Upland a great destination for travelers looking to enjoy both warm days and cool nights.

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

The chart illustrates May temperature patterns in Upland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Upland, May typically has an average temperature of 18°C (65°F), with highs reaching up to 34°C (94°F) and lows dropping to around 2°C (36°F).

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

May Precipitation in Upland

In Upland in May, the precipitation amount is 135 mm (5.3 in), occurring over the course of 12 days.

May Precipitation Trends in Upland

The chart displays monthly precipitation patterns in Upland, 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 Upland, May typically receives around 135 mm (5.3 inches) of precipitation spread over approximately 12 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 Upland

In Upland in May, humidity is 78%. With an average temperature of 18°C (65°F), this humidity feels like a warm, enveloping blanket, making travel quite muggy and potentially uncomfortable, as it can leave you feeling sticky and fatigued more quickly than usual.

May Average Humidity in Upland

This chart illustrates the average monthly humidity levels in Upland, 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 Upland is approximately 78%, 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 Upland

In Upland 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 Upland.

Maximum UV Index Levels in Upland for May

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

Data source: Upland 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 Upland Compares to Other Months

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

This table compares monthly weather conditions in Upland, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	64 mm (2.5 inches)	84%	moderate
February Weather	4°C (39°F)	103 mm (4.1 inches)	83%	moderate
March Weather	7°C (45°F)	106 mm (4.2 inches)	83%	high
April Weather	13°C (55°F)	105 mm (4.1 inches)	81%	very high
May Weather	18°C (65°F)	135 mm (5.3 inches)	78%	very high
June Weather	23°C (74°F)	118 mm (4.7 inches)	79%	very high
July Weather	26°C (79°F)	136 mm (5.4 inches)	74%	very high
August Weather	25°C (77°F)	140 mm (5.5 inches)	72%	very high
September Weather	22°C (71°F)	100 mm (3.9 inches)	75%	very high
October Weather	16°C (61°F)	109 mm (4.3 inches)	81%	high
November Weather	8°C (47°F)	83 mm (3.3 inches)	85%	moderate
December Weather	4°C (40°F)	100 mm (3.9 inches)	84%	moderate