May Weather in Sumner, United States

Last updated: June 24, 2025

In May, the average temperature in Sumner, United States hovers around 20°C (68°F), making it a pleasant time to visit. However, be prepared for temperature fluctuations, with minimums dipping to 2°C (35°F) and maximums soaring up to 35°C (95°F). Expect 133 mm (5.3 in) of precipitation spread over about 15 days, contributing to the region's lush landscape. With an average humidity of 80%, bring your light layers and an umbrella to enjoy the unique charm of the season!

May Temperature in Sumner

In May in Sumner, the average temperature is 20°C (68°F). Maximum temperatures can reach 35°C (95°F), while minimums can drop to as low as 2°C (35°F). Be sure to pack for both warm days and cool evenings for your trip!

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

The chart illustrates May temperature patterns in Sumner, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sumner, May typically has an average temperature of 20°C (68°F), with highs reaching up to 35°C (95°F) and lows dropping to around 2°C (35°F).

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

May Precipitation in Sumner

In Sumner in May, the precipitation amount is 133 mm (5.3 in) over a span of 15 days.

May Precipitation Trends in Sumner

The chart displays monthly precipitation patterns in Sumner, 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 Sumner, May typically receives around 133 mm (5.3 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 Sumner

In Sumner in May, humidity is 80%. With an average temperature of 20°C (68°F), this humidity feels like traveling through a warm, dense blanket that clings to your skin, making you feel both sticky and lethargic as you explore the sights.

May Average Humidity in Sumner

This chart illustrates the average monthly humidity levels in Sumner, 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 Sumner is approximately 80%, 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 Sumner

In Sumner 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 Sumner.

Maximum UV Index Levels in Sumner for May

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

Data source: Sumner 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 Sumner Compares to Other Months

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

This table compares monthly weather conditions in Sumner, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	1°C (33°F)	91 mm (3.6 inches)	84%	moderate
February Weather	2°C (37°F)	107 mm (4.2 inches)	82%	moderate
March Weather	8°C (47°F)	133 mm (5.2 inches)	84%	high
April Weather	13°C (56°F)	120 mm (4.7 inches)	83%	very high
May Weather	20°C (68°F)	133 mm (5.3 inches)	80%	very high
June Weather	25°C (77°F)	112 mm (4.4 inches)	83%	extreme
July Weather	26°C (80°F)	97 mm (3.8 inches)	82%	very high
August Weather	25°C (77°F)	92 mm (3.6 inches)	82%	very high
September Weather	22°C (73°F)	70 mm (2.7 inches)	79%	very high
October Weather	16°C (60°F)	100 mm (3.9 inches)	79%	high
November Weather	7°C (44°F)	102 mm (4.0 inches)	88%	moderate
December Weather	4°C (39°F)	95 mm (3.7 inches)	87%	moderate