September Weather in Salem, United States

Last updated: June 24, 2025

In September, the average temperature in Salem, United States hovers around 23°C (75°F). Expect a minimum chill of 8°C (47°F), while temperatures can soar up to a sizzling 36°C (97°F). Be prepared for some rain, with an average precipitation of 76 mm (3.0 in) spread over 6 days, and keep in mind the average humidity is 68%.

September Temperature in Salem

In September in Salem, the average temperature is 23°C (75°F). Maximums can reach 36°C (97°F), and minimums can be as low as 8°C (47°F). This makes Salem a great destination for travelers seeking pleasant weather, but it’s advisable to pack for both warm and cool conditions.

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 23°C (75°F), with highs reaching up to 36°C (97°F) and lows dropping to around 8°C (47°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 reaches 76 mm (3.0 in) over the course of 6 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 76 mm (3.0 inches) of precipitation spread over approximately 6 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Salem

In Salem in September humidity is 68%. With an average temperature of 23°C (75°F), this humidity feels like a warm, sultry embrace, making travel slightly uncomfortable as you may find yourself sweating more than usual.

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 68%, 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 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 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 9, 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	3°C (38°F)	83 mm (3.3 inches)	83%	moderate
February Weather	5°C (42°F)	115 mm (4.5 inches)	81%	high
March Weather	11°C (52°F)	144 mm (5.7 inches)	80%	very high
April Weather	14°C (58°F)	166 mm (6.5 inches)	80%	very high
May Weather	20°C (68°F)	174 mm (6.9 inches)	83%	very high
June Weather	25°C (77°F)	83 mm (3.3 inches)	83%	extreme
July Weather	27°C (81°F)	82 mm (3.2 inches)	76%	extreme
August Weather	26°C (79°F)	108 mm (4.2 inches)	69%	very high
September Weather	23°C (75°F)	76 mm (3.0 inches)	68%	very high
October Weather	16°C (62°F)	110 mm (4.3 inches)	72%	high
November Weather	9°C (48°F)	81 mm (3.2 inches)	83%	moderate
December Weather	6°C (44°F)	89 mm (3.5 inches)	86%	moderate