September Weather in Salem, United States

Last updated: June 24, 2025

In Salem, United States, the average temperature in September is a pleasant 19°C (67°F). While you may experience minimum temperatures dipping to 4°C (40°F), don't be surprised by the occasional peak of 33°C (92°F). With 96 mm (3.8 in) of precipitation spread across 9 days, a touch of rain adds to the charm of the season. Don't forget your umbrella, as the average humidity hovers around 75%, giving the air that quintessential tropical feel!

September Temperature in Salem

In September in Salem, the average temperature is 19°C (67°F). Maximums can reach 33°C (92°F) while minimums can be as low as 4°C (40°F). This range makes it an ideal time for travelers to enjoy a variety of outdoor activities while also being prepared for cooler evenings.

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 19°C (67°F), with highs reaching up to 33°C (92°F) and lows dropping to around 4°C (40°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 total precipitation amount is 96 mm (3.8 in) spread over a period of 9 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 96 mm (3.8 inches) of precipitation spread over approximately 9 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 75%. With an average temperature of 19°C (67°F), this humidity feels like a warm embrace, making travel invigorating yet slightly sticky, as you navigate through the vibrant streets or scenic landscapes.

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 75%, 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 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 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 8, which falls under the very high 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	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