Hottest Septembers in California since 1895

Written by:
September 26, 2025
Andrzej Kubik // Shutterstock

Hottest Septembers in California since 1895

In 2022, the continental United States experienced its , according to data from the National Oceanic and Atmospheric Administration, while 20 states saw one of their in the same month. The year prior, July marked the .

Climate change is driving rising temperatures and more record heat. The has climbed each decade since 1880 by about .14 degrees Fahrenheit, or roughly 2 degrees Fahrenheit total.

compiled a ranking of the hottest Septembers in California since 1895 using data from the . Rankings are based on the highest average temperature in each month. For each of the hottest months listed below, we've included the average state temperature, state-wide highs and lows for the month, and the total precipitation.

#7. September 2021 (tie)
- Average temperature: 72.2掳F
- Monthly high temperature: 86.6掳F
- Monthly low temperature: 57.7掳F
- Total precipitation: 0.36"

#7. September 2014 (tie)
- Average temperature: 72.2掳F
- Monthly high temperature: 86.2掳F
- Monthly low temperature: 58.3掳F
- Total precipitation: 0.72"

#7. September 2011 (tie)
- Average temperature: 72.2掳F
- Monthly high temperature: 87.2掳F
- Monthly low temperature: 57.3掳F
- Total precipitation: 0.28"

#7. September 1991 (tie)
- Average temperature: 72.2掳F
- Monthly high temperature: 87掳F
- Monthly low temperature: 57.4掳F
- Total precipitation: 0.24"

#7. September 1984 (tie)
- Average temperature: 72.2掳F
- Monthly high temperature: 86.5掳F
- Monthly low temperature: 57.9掳F
- Total precipitation: 0.27"

#7. September 1979 (tie)
- Average temperature: 72.2掳F
- Monthly high temperature: 87.6掳F
- Monthly low temperature: 56.7掳F
- Total precipitation: 0.24"

#6. September 2024
- Average temperature: 72.6掳F
- Monthly high temperature: 87.3掳F
- Monthly low temperature: 57.8掳F
- Total precipitation: 0.12"

#5. September 2003
- Average temperature: 72.9掳F
- Monthly high temperature: 88掳F
- Monthly low temperature: 57.7掳F
- Total precipitation: 0.17"

#4. September 2009
- Average temperature: 73掳F
- Monthly high temperature: 88.4掳F
- Monthly low temperature: 57.6掳F
- Total precipitation: 0.09"

#3. September 2012
- Average temperature: 73.1掳F
- Monthly high temperature: 88.3掳F
- Monthly low temperature: 57.8掳F
- Total precipitation: 0.1"

#2. September 2022
- Average temperature: 73.8掳F
- Monthly high temperature: 87.6掳F
- Monthly low temperature: 60.1掳F
- Total precipitation: 0.83"

#1. September 2020
- Average temperature: 74掳F
- Monthly high temperature: 88.8掳F
- Monthly low temperature: 59.1掳F
- Total precipitation: 0.04"

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