September Weather in Alturas, United States

Last updated: June 24, 2025

In September, the average temperature in Alturas, United States hovers around 27°C (81°F). Expect a comfortable minimum of 19°C (67°F) and a warm maximum of 35°C (94°F). During this time, precipitation averages 197 mm (7.7 in) over about 21 days, contributing to an average humidity level of 83%. Prepare for a mix of warmth and moisture!

September Temperature in Alturas

In September in Alturas, the average temperature is 27°C (81°F), with maximums reaching 35°C (94°F) and minimums dropping to as low as 19°C (67°F). This warm climate makes Alturas an ideal destination for travelers seeking pleasant weather and outdoor activities.

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 27°C (81°F), with highs reaching up to 35°C (94°F) and lows dropping to around 19°C (67°F).

Data source: Temperature data for Alturas generated using information from the Copernicus Climate Change Service.

September Precipitation in Alturas

In Alturas in September, the precipitation amount is 197 mm (7.7 in) spread over 21 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 197 mm (7.7 inches) of precipitation spread over approximately 21 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Alturas

In Alturas in September humidity is 83%. With an average temperature of 27°C (81°F), this humidity feels like a warm blanket enveloping you, making sightseeing and outdoor activities feel more exhausting and requiring frequent breaks to relax in the shade or cool off.

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 83%, 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 Alturas

In Alturas in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, 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 11, which falls under the extreme exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	17°C (63°F)	36 mm (1.4 inches)	83%	high
February Weather	20°C (69°F)	49 mm (1.9 inches)	80%	very high
March Weather	21°C (70°F)	17 mm (0.7 inches)	75%	very high
April Weather	24°C (75°F)	68 mm (2.7 inches)	68%	extreme
May Weather	26°C (79°F)	135 mm (5.3 inches)	65%	extreme
June Weather	27°C (81°F)	236 mm (9.3 inches)	73%	extreme
July Weather	27°C (82°F)	265 mm (10.4 inches)	77%	extreme
August Weather	28°C (82°F)	260 mm (10.2 inches)	80%	extreme
September Weather	27°C (81°F)	197 mm (7.7 inches)	83%	extreme
October Weather	26°C (78°F)	74 mm (2.9 inches)	83%	very high
November Weather	21°C (70°F)	45 mm (1.8 inches)	83%	high
December Weather	18°C (66°F)	55 mm (2.2 inches)	84%	moderate