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September Weather in Salem, United States

Last updated: June 24, 2025

In September, the average temperature in Salem, United States hovers around 22°C (71°F). Be prepared for a range, as it can dip as low as 8°C (46°F) or soar to a blistering 35°C (95°F). Expect 102 mm (4.0 in) of precipitation spread over 8 days, with an average humidity of 69%. Whether you're basking in the sun or taking cover from the rain, make the most of your time in this vibrant location!

September Temperature in Salem

In September in Salem, the average temperature is 22°C (71°F). The maximum can reach 35°C (95°F) while the minimum can be as low as 8°C (46°F). Be sure to pack a mix of light clothing and warmer layers to stay comfortable during your travels.

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 (71°F), with highs reaching up to 35°C (95°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec343847556774787671604440
Data source: Temperature data for Salem generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Salem

In Salem in September, the precipitation amount is 102 mm (4.0 in) over the course of 8 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 102 mm (4.0 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec841191381391381489810310210394105
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Salem

In Salem in September humidity is 69%. With an average temperature of 22°C (71°F), this humidity feels like walking through a warm embrace, making travel slightly uncomfortable yet refreshing, as the air clings to your skin and adds a layer of warmth to your exploration.

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 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
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.
JanFebMarAprMayJunJulAugSepOctNovDec35710101110108643
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.
 TemperaturePrecipitationHumidityUV
January Weather1°C (35°F)84 mm (3.3 inches)87%moderate
February Weather3°C (38°F)119 mm (4.7 inches)85%moderate
March Weather8°C (47°F)138 mm (5.4 inches)86%high
April Weather13°C (55°F)139 mm (5.5 inches)84%very high
May Weather19°C (67°F)138 mm (5.4 inches)79%very high
June Weather24°C (75°F)148 mm (5.8 inches)82%extreme
July Weather26°C (78°F)98 mm (3.9 inches)79%very high
August Weather24°C (76°F)103 mm (4.1 inches)70%very high
September Weather22°C (71°F)102 mm (4.0 inches)69%very high
October Weather15°C (60°F)103 mm (4.0 inches)76%high
November Weather7°C (45°F)93 mm (3.7 inches)88%moderate
December Weather4°C (40°F)105 mm (4.1 inches)87%moderate

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