September Weather in Salem, United States

Last updated: June 24, 2025

In Salem, United States, the average temperature in September is a pleasant 25°C (77°F). However, temperatures can vary, with minimums dipping to 10°C (51°F) and maximums soaring to 37°C (98°F). Expect 28 mm (1.1 in) of precipitation over about 3 days, paired with an average humidity of 70%. Plan your activities accordingly to enjoy the best of the season!

September Temperature in Salem

In September in Salem, the average temperature is 25°C (77°F). Maximum temperatures can reach 37°C (98°F), and the minimum can drop as low as 10°C (51°F). This makes for a pleasant time to explore and enjoy various outdoor activities.

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

The chart illustrates September 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, September typically has an average temperature of 25°C (77°F), with highs reaching up to 37°C (98°F) and lows dropping to around 10°C (51°F).

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

September Precipitation in Salem

In Salem in September, the precipitation amount is 28 mm (1.1 in) over the course of 3 days.

September Precipitation Trends in Salem

The chart displays monthly precipitation patterns in Salem, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Salem, September typically receives around 28 mm (1.1 inches) of precipitation spread over approximately 3 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Salem

In Salem in September, humidity is 70%. With an average temperature of 25°C (77°F), this humidity feels like walking through a warm, moist blanket that clings to your skin, making every step feel heavier as you explore the sights and sounds of your destination.

September Average Humidity in Salem

This chart illustrates the average monthly humidity levels in Salem, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Salem is approximately 70%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Salem

In Salem in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Salem.

Maximum UV Index Levels in Salem for September

The chart shows the monthly maximum UV Index (UVI) for Salem in September, 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 September, the maximum UV index in Salem typically reaches 11, which falls under the extreme exposure category.

Data source: Salem September 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 September 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 September’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 September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (45°F)	14 mm (0.6 inches)	79%	moderate
February Weather	9°C (49°F)	18 mm (0.7 inches)	79%	high
March Weather	14°C (57°F)	14 mm (0.6 inches)	65%	very high
April Weather	19°C (66°F)	4 mm (0.1 inches)	55%	extreme
May Weather	23°C (74°F)	4 mm (0.2 inches)	54%	extreme
June Weather	28°C (83°F)	22 mm (0.9 inches)	53%	extreme
July Weather	28°C (83°F)	30 mm (1.2 inches)	55%	extreme
August Weather	28°C (82°F)	27 mm (1.1 inches)	57%	extreme
September Weather	25°C (77°F)	28 mm (1.1 inches)	70%	extreme
October Weather	18°C (65°F)	32 mm (1.3 inches)	75%	very high
November Weather	12°C (55°F)	21 mm (0.8 inches)	83%	high
December Weather	8°C (46°F)	11 mm (0.4 inches)	82%	moderate