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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 Washington 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.

#10. September 2011
- Average temperature: 61°F
- Monthly high temperature: 74.5°F
- Monthly low temperature: 47.6°F
- Total precipitation: 1.29"

#8. September 2020 (tie)
- Average temperature: 61.2°F
- Monthly high temperature: 73.3°F
- Monthly low temperature: 49.1°F
- Total precipitation: 2.42"

#8. September 1994 (tie)
- Average temperature: 61.2°F
- Monthly high temperature: 74.4°F
- Monthly low temperature: 48°F
- Total precipitation: 1.37"

#7. September 1963
- Average temperature: 61.6°F
- Monthly high temperature: 74.6°F
- Monthly low temperature: 48.6°F
- Total precipitation: 1.45"

#6. September 2022
- Average temperature: 61.7°F
- Monthly high temperature: 74.7°F
- Monthly low temperature: 48.6°F
- Total precipitation: 0.42"

#5. September 2024
- Average temperature: 61.8°F
- Monthly high temperature: 74.1°F
- Monthly low temperature: 49.5°F
- Total precipitation: 0.99"

#4. September 1938
- Average temperature: 62°F
- Monthly high temperature: 75.8°F
- Monthly low temperature: 48.2°F
- Total precipitation: 0.96"

#2. September 1998 (tie)
- Average temperature: 62.2°F
- Monthly high temperature: 76°F
- Monthly low temperature: 48.4°F
- Total precipitation: 0.66"

#2. September 1990 (tie)
- Average temperature: 62.2°F
- Monthly high temperature: 75.9°F
- Monthly low temperature: 48.5°F
- Total precipitation: 0.21"

#1. September 1967
- Average temperature: 62.3°F
- Monthly high temperature: 76.8°F
- Monthly low temperature: 47.8°F
- Total precipitation: 1.21"