May Weather in Salem, United States

Last updated: June 24, 2025

In Salem, United States, the average temperature in May hovers around 18°C (66°F). However, temperatures can range from a chilly 3°C (37°F) to a sweltering 33°C (91°F). Expect 178 mm (7.0 in) of precipitation over about 14 days, with an average humidity level of 83%. Plan accordingly to fully enjoy your time in this vibrant destination!

May Temperature in Salem

In May in Salem, the average temperature is 18°C (66°F). Maximum temperatures can soar to 33°C (91°F), while minimums can drop as low as 3°C (37°F). Be sure to pack layers to stay comfortable during your travels!

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 18°C (66°F), with highs reaching up to 33°C (91°F) and lows dropping to around 3°C (37°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 total precipitation amount is 178 mm (7.0 in) spread over 14 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 178 mm (7.0 inches) of precipitation spread over approximately 14 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 83%. With an average temperature of 18°C (66°F), this humidity feels like a warm, thick blanket enveloping you, making it a bit uncomfortable for traveling as you may need to take frequent breaks to cool down and stay hydrated.

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 83%, 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 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 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 10, 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	1°C (34°F)	75 mm (3.0 inches)	83%	moderate
February Weather	3°C (37°F)	96 mm (3.8 inches)	81%	high
March Weather	9°C (48°F)	136 mm (5.3 inches)	80%	high
April Weather	12°C (55°F)	152 mm (6.0 inches)	80%	very high
May Weather	18°C (66°F)	178 mm (7.0 inches)	83%	very high
June Weather	24°C (75°F)	84 mm (3.3 inches)	83%	extreme
July Weather	26°C (79°F)	84 mm (3.3 inches)	76%	extreme
August Weather	24°C (76°F)	101 mm (4.0 inches)	69%	very high
September Weather	22°C (72°F)	59 mm (2.3 inches)	68%	very high
October Weather	15°C (58°F)	112 mm (4.4 inches)	72%	high
November Weather	7°C (45°F)	69 mm (2.7 inches)	83%	moderate
December Weather	4°C (40°F)	60 mm (2.4 inches)	86%	moderate