May Weather in Salem, United States

Last updated: June 24, 2025

In May, the average temperature in Salem, United States hovers around 15°C (59°F), offering a mild climate for residents and visitors alike. Expect a minimum of 1°C (34°F) on cooler days, while sunny spells can soar to a maximum of 33°C (91°F). With 111 mm (4.4 in) of precipitation spread over 12 days, it's wise to keep an umbrella handy. The average humidity stands at a comfortable 75%, making it a pleasant time to explore the beauty of the region.

May Temperature in Salem

In May in Salem, the average temperature is 15°C (59°F). The maximum can reach 33°C (91°F), while the minimum can drop as low as 1°C (34°F). This makes it an ideal time for travelers to enjoy a variety of outdoor activities while preparing for some temperature fluctuations.

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

The chart illustrates May temperature patterns in Salem, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Salem, May typically has an average temperature of 15°C (59°F), with highs reaching up to 33°C (91°F) and lows dropping to around 1°C (34°F).

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

May Precipitation in Salem

In Salem, in May, the precipitation amount is 111 mm (4.4 in) over a span of 12 days.

May Precipitation Trends in Salem

The chart displays monthly precipitation patterns in Salem, 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 Salem, May typically receives around 111 mm (4.4 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 Salem

In Salem in May, humidity is 75%. With an average temperature of 15°C (59°F), this humidity feels like a warm blanket enveloping you, making it feel more oppressive than refreshing, which can be a challenge for travelers seeking comfort while exploring the area.

May Average Humidity in Salem

This chart illustrates the average monthly humidity levels in Salem, 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 Salem is approximately 75%, 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 Salem

In Salem in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Salem.

Maximum UV Index Levels in Salem for May

The chart shows the monthly maximum UV Index (UVI) for Salem 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 Salem typically reaches 9, which falls under the very high exposure category.

Data source: Salem 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 Salem Compares to Other Months

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

This table compares monthly weather conditions in Salem, 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 (32°F)	70 mm (2.8 inches)	84%	moderate
February Weather	1°C (34°F)	90 mm (3.5 inches)	84%	moderate
March Weather	4°C (39°F)	95 mm (3.7 inches)	82%	high
April Weather	9°C (49°F)	128 mm (5.1 inches)	79%	very high
May Weather	15°C (59°F)	111 mm (4.4 inches)	75%	very high
June Weather	20°C (69°F)	95 mm (3.8 inches)	78%	very high
July Weather	24°C (75°F)	158 mm (6.2 inches)	76%	very high
August Weather	23°C (74°F)	107 mm (4.2 inches)	76%	very high
September Weather	19°C (67°F)	96 mm (3.8 inches)	75%	very high
October Weather	14°C (57°F)	131 mm (5.2 inches)	75%	high
November Weather	7°C (44°F)	96 mm (3.8 inches)	80%	moderate
December Weather	2°C (36°F)	133 mm (5.2 inches)	80%	low