nomadseason

September Weather in Susanville, United States

Last updated: June 24, 2025

In September, the average temperature in Susanville, United States is a pleasant 16°C (62°F). However, be prepared for a range, as temperatures can drop as low as -2°C (28°F) and soar up to 35°C (95°F). With an average precipitation of 20 mm (0.8 in) spread over 3 days, the humidity hovers around 46%, making for a refreshing climate.

September Temperature in Susanville

In September in Susanville, the average temperature is 16°C (62°F). Maximum temperatures can reach 35°C (95°F), while the minimum can drop as low as -2°C (28°F). Be prepared for a wide range of temperatures if you plan to travel during this time.

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

The chart illustrates September temperature patterns in Susanville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Susanville, September typically has an average temperature of 16°C (62°F), with highs reaching up to 35°C (95°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec313135445364727061493930
Data source: Temperature data for Susanville generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Susanville

In Susanville in September, the precipitation amount is 20 mm (0.8 in) accumulated over a period of 3 days.

September Precipitation Trends in Susanville

The chart displays monthly precipitation patterns in Susanville, 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 Susanville, September typically receives around 20 mm (0.8 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec10411292485314101020354979
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Susanville

In Susanville in September, humidity is 46%. With an average temperature of 16°C (62°F), this humidity feels like a mild and refreshing embrace, making it a comfortable time for traveling as you can explore the sights without feeling overly sticky or fatigued.

September Average Humidity in Susanville

This chart illustrates the average monthly humidity levels in Susanville, 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 Susanville is approximately 46%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%87%86%83%72%67%56%42%46%67%86%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Susanville

In Susanville 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 Susanville.

Maximum UV Index Levels in Susanville for September

The chart shows the monthly maximum UV Index (UVI) for Susanville 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 Susanville typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec45810111211119743
Data source: Susanville 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 Susanville Compares to Other Months

Weather in Susanville varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Susanville, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Susanville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)104 mm (4.1 inches)86%moderate
February Weather0°C (32°F)112 mm (4.4 inches)87%moderate
March Weather2°C (35°F)92 mm (3.6 inches)86%very high
April Weather6°C (44°F)48 mm (1.9 inches)83%very high
May Weather12°C (53°F)53 mm (2.1 inches)72%extreme
June Weather18°C (64°F)14 mm (0.5 inches)67%extreme
July Weather22°C (72°F)10 mm (0.4 inches)56%extreme
August Weather21°C (71°F)10 mm (0.4 inches)42%extreme
September Weather16°C (62°F)20 mm (0.8 inches)46%very high
October Weather9°C (49°F)35 mm (1.4 inches)67%high
November Weather4°C (39°F)49 mm (1.9 inches)86%moderate
December Weather-1°C (30°F)79 mm (3.1 inches)86%moderate

Compare Susanville's Climate with Cities Worldwide