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September Weather in Alturas, United States

Last updated: June 24, 2025

In Alturas, United States, the average temperature in September hovers around 17°C (63°F), offering a mild climate. However, temperatures can vary widely, with minimums dipping to -1°C (31°F) and maximums reaching 36°C (98°F). Expect approximately 20 mm (0.8 in) of precipitation over 3 days, while the average humidity remains at a comfortable 46%.

September Temperature in Alturas

In September in Alturas, the average temperature is 17°C (63°F). The maximum can reach 36°C (98°F), while the minimum can be as low as -1°C (31°F). This variation in temperature makes it essential for travelers to pack accordingly for both warm and cool conditions.

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

The chart illustrates September temperature patterns in Alturas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alturas, September typically has an average temperature of 17°C (63°F), with highs reaching up to 36°C (98°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec323237455565747262483930
Data source: Temperature data for Alturas 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 Alturas

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

September Precipitation Trends in Alturas

The chart displays monthly precipitation patterns in Alturas, 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 Alturas, September typically receives around 20 mm (0.8 inches) of precipitation spread over approximately 3 days.
JanFebMarAprMayJunJulAugSepOctNovDec7475725453183620354769
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Alturas

In Alturas in September, humidity is 46%. With an average temperature of 17°C (63°F), this humidity feels like a mild embrace—comfortable for exploring the sights, though you might notice a slight heaviness in the air that encourages a leisurely pace as you take in the vibrant surroundings.

September Average Humidity in Alturas

This chart illustrates the average monthly humidity levels in Alturas, 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 Alturas 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 Alturas

In Alturas 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 Alturas.

Maximum UV Index Levels in Alturas for September

The chart shows the monthly maximum UV Index (UVI) for Alturas 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 Alturas typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec4579111211119743
Data source: Alturas 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 Alturas Compares to Other Months

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

This table compares monthly weather conditions in Alturas, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)74 mm (2.9 inches)86%moderate
February Weather0°C (33°F)74 mm (2.9 inches)87%moderate
March Weather3°C (38°F)72 mm (2.9 inches)86%high
April Weather7°C (45°F)54 mm (2.1 inches)83%very high
May Weather13°C (55°F)53 mm (2.1 inches)72%extreme
June Weather18°C (65°F)18 mm (0.7 inches)67%extreme
July Weather23°C (74°F)3 mm (0.1 inches)56%extreme
August Weather22°C (72°F)6 mm (0.2 inches)42%extreme
September Weather17°C (63°F)20 mm (0.8 inches)46%very high
October Weather9°C (49°F)35 mm (1.4 inches)67%high
November Weather4°C (40°F)47 mm (1.8 inches)86%moderate
December Weather-1°C (31°F)69 mm (2.7 inches)86%moderate

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