September Weather in Salem, United States

Last updated: June 24, 2025

In September, the average temperature in Salem, United States hovers around 22°C (72°F). However, be prepared for a temperature range that can dip to a chilly 7°C (45°F) and soar to a sizzling 34°C (94°F). Rainfall is common, with an average precipitation of 128 mm (5.0 in) spread over 10 days, contributing to an average humidity of 75%. Stay ready for a blend of climates!

September Temperature in Salem

In September in Salem, the average temperature is 22°C (72°F). The maximum can reach 34°C (94°F) and the minimum can be as low as 7°C (45°F). This diverse temperature range makes it a great time for travelers to enjoy a mix of warm and cooler experiences.

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 22°C (72°F), with highs reaching up to 34°C (94°F) and lows dropping to around 7°C (45°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 128 mm (5.0 in) recorded over a span of 10 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 128 mm (5.0 inches) of precipitation spread over approximately 10 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 75%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet requiring travelers to stay hydrated and take breaks in shaded areas.

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 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	5°C (41°F)	97 mm (3.8 inches)	86%	moderate
February Weather	8°C (46°F)	120 mm (4.7 inches)	85%	high
March Weather	10°C (51°F)	100 mm (3.9 inches)	84%	very high
April Weather	15°C (59°F)	137 mm (5.4 inches)	82%	very high
May Weather	19°C (67°F)	137 mm (5.4 inches)	83%	very high
June Weather	23°C (73°F)	81 mm (3.2 inches)	82%	extreme
July Weather	25°C (78°F)	66 mm (2.6 inches)	80%	extreme
August Weather	24°C (76°F)	95 mm (3.7 inches)	74%	very high
September Weather	22°C (72°F)	128 mm (5.0 inches)	75%	very high
October Weather	17°C (62°F)	151 mm (5.9 inches)	79%	very high
November Weather	9°C (49°F)	84 mm (3.3 inches)	87%	moderate
December Weather	7°C (44°F)	116 mm (4.6 inches)	87%	moderate