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September Weather in Potter Valley, United States

Last updated: June 24, 2025

In Potter Valley, United States, the average temperature in September reaches a comfortable 20°C (69°F). However, be prepared for extremes, as temperatures can dip to a brisk 3°C (38°F) or soar up to a sizzling 40°C (105°F). With an average humidity of 68%, you might find the air a bit muggy. Additionally, you can expect some light rain, with an average precipitation amount of 6 mm (0.2 in) over the course of 1 day.

September Temperature in Potter Valley

In September in Potter Valley, the average temperature is 20°C (69°F). Maximum temperatures can reach up to 40°C (105°F), while minimum temperatures can drop as low as 3°C (38°F). Travelers should pack for both warm days and cool nights to fully enjoy their stay.

September Weather in Potter Valley: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Potter Valley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Potter Valley, September typically has an average temperature of 20°C (69°F), with highs reaching up to 40°C (105°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec444547535969767568595044
Data source: Temperature data for Potter Valley 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 Potter Valley

In Potter Valley in September, the precipitation amount is 6 mm (0.2 in) over the course of 1 day.

September Precipitation Trends in Potter Valley

The chart displays monthly precipitation patterns in Potter Valley, 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 Potter Valley, September typically receives around 6 mm (0.2 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec164167119654740265280110
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Potter Valley

In Potter Valley in September, humidity is 68%. With an average temperature of 20°C (69°F), this humidity feels like a warm embrace, making outdoor exploration both refreshing and slightly sticky, requiring occasional breaks in the shade to stay comfortable while traveling.

September Average Humidity in Potter Valley

This chart illustrates the average monthly humidity levels in Potter Valley, 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 Potter Valley is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%83%80%80%76%70%66%68%72%84%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Potter Valley

In Potter Valley 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 Potter Valley.

Maximum UV Index Levels in Potter Valley for September

The chart shows the monthly maximum UV Index (UVI) for Potter Valley 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 Potter Valley typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3578111111109743
Data source: Potter Valley 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 Potter Valley Compares to Other Months

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

This table compares monthly weather conditions in Potter Valley, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (44°F)164 mm (6.5 inches)86%moderate
February Weather7°C (46°F)167 mm (6.6 inches)84%moderate
March Weather8°C (47°F)119 mm (4.7 inches)83%high
April Weather12°C (53°F)65 mm (2.6 inches)80%very high
May Weather15°C (59°F)47 mm (1.9 inches)80%extreme
June Weather20°C (69°F)4 mm (0.1 inches)76%extreme
July Weather24°C (76°F)0 mm (0.0 inches)70%extreme
August Weather24°C (75°F)2 mm (0.1 inches)66%very high
September Weather20°C (69°F)6 mm (0.2 inches)68%very high
October Weather15°C (60°F)52 mm (2.0 inches)72%high
November Weather10°C (50°F)80 mm (3.2 inches)84%moderate
December Weather7°C (44°F)110 mm (4.3 inches)84%moderate

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