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September Weather in Yreka, United States

Last updated: June 24, 2025

In September, the average temperature in Yreka, United States hovers around 17°C (62°F). Expect a range from a chilly -1°C (31°F) to a scorching 36°C (98°F). With approximately 20 mm (0.8 in) of rain spread over 4 days, the average humidity sits at a comfortable 62%.

September Temperature in Yreka

In September in Yreka, the average temperature is 17°C (62°F). Maximums can reach 36°C (98°F) and minimums can be as low as -1°C (31°F). Be prepared for a wide range of temperatures when traveling during this time.

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

The chart illustrates September temperature patterns in Yreka, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Yreka, September typically has an average temperature of 17°C (62°F), with highs reaching up to 36°C (98°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec363741475564727062504035
Data source: Temperature data for Yreka 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 Yreka

In Yreka in September, the total precipitation amount is 20 mm (0.8 in) spread over a period of 4 days.

September Precipitation Trends in Yreka

The chart displays monthly precipitation patterns in Yreka, 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 Yreka, September typically receives around 20 mm (0.8 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec121118916149165520387292
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Yreka

In Yreka in September, humidity is 62%. With an average temperature of 17°C (62°F), this humidity feels like a warm embrace, making it a comfortable yet slightly muggy environment for traveling, perfect for leisurely strolls but possibly requiring light clothing adjustments.

September Average Humidity in Yreka

This chart illustrates the average monthly humidity levels in Yreka, 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 Yreka is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%85%82%81%79%70%60%62%72%87%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Yreka

In Yreka 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 Yreka.

Maximum UV Index Levels in Yreka for September

The chart shows the monthly maximum UV Index (UVI) for Yreka 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 Yreka typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579111111109643
Data source: Yreka 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 Yreka Compares to Other Months

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

This table compares monthly weather conditions in Yreka, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)121 mm (4.8 inches)86%moderate
February Weather3°C (37°F)118 mm (4.7 inches)85%moderate
March Weather5°C (42°F)91 mm (3.6 inches)85%high
April Weather9°C (48°F)61 mm (2.4 inches)82%very high
May Weather13°C (55°F)49 mm (1.9 inches)81%extreme
June Weather18°C (64°F)16 mm (0.6 inches)79%extreme
July Weather22°C (72°F)5 mm (0.2 inches)70%extreme
August Weather21°C (71°F)5 mm (0.2 inches)60%very high
September Weather17°C (62°F)20 mm (0.8 inches)62%very high
October Weather10°C (51°F)38 mm (1.5 inches)72%high
November Weather5°C (41°F)72 mm (2.8 inches)87%moderate
December Weather2°C (35°F)92 mm (3.6 inches)86%moderate

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