May Weather in Sumner, United States

Last updated: June 24, 2025

In Sumner, United States, the average temperature in May hovers around 13°C (55°F), with daily extremes ranging from a chilly 4°C (39°F) to a warm 26°C (80°F). This month also brings about 69 mm (2.7 in) of precipitation over approximately 12 days, contributing to an average humidity of 81%. Be prepared for a mix of mild weather and occasional showers!

May Temperature in Sumner

In May in Sumner, the average temperature is 13°C (55°F). Maximums can reach 26°C (80°F), while minimums can drop as low as 4°C (39°F). It's a great time to explore Sumner while enjoying mild weather and varying temperatures.

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 13°C (55°F), with highs reaching up to 26°C (80°F) and lows dropping to around 4°C (39°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 69 mm (2.7 in) over the span of 12 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 69 mm (2.7 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 Sumner

In Sumner in May, humidity is 81%. With an average temperature of 13°C (55°F), this humidity feels like a damp blanket wrapping around you, making strolls outdoors feel heavy and slightly oppressive, which may be less than ideal for travelers looking to explore comfortably.

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 81%, 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 is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to 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 8, 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	5°C (41°F)	187 mm (7.4 inches)	86%	low
February Weather	4°C (40°F)	193 mm (7.6 inches)	86%	moderate
March Weather	6°C (44°F)	138 mm (5.4 inches)	87%	moderate
April Weather	9°C (48°F)	120 mm (4.7 inches)	84%	high
May Weather	13°C (55°F)	69 mm (2.7 inches)	81%	very high
June Weather	16°C (60°F)	64 mm (2.5 inches)	82%	very high
July Weather	18°C (65°F)	13 mm (0.5 inches)	79%	very high
August Weather	19°C (66°F)	16 mm (0.6 inches)	63%	very high
September Weather	16°C (61°F)	97 mm (3.8 inches)	62%	high
October Weather	10°C (51°F)	153 mm (6.0 inches)	83%	moderate
November Weather	7°C (46°F)	193 mm (7.6 inches)	89%	moderate
December Weather	5°C (41°F)	208 mm (8.2 inches)	88%	low