Temperatures in September
It's hot in September in the United States with an average temperature of 30°C. Temperatures this month range from a low of 26°C to a high of 33°C. At night, you can expect temperatures between 13°C and 21°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for United States in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in United States with hot temperatures, averaging around 32°C during the day and nights close to 20°C. A few showers might pop up in the first days of the month, but the weather remains mostly sunny and dry.
Mid-September
By mid-September, the average daytime temperature drops to around 30°C, with nights close to 18°C. There might be a few showers during this period, but plenty of dry days with sunshine too.
Temperatures vary between day and night, so it’s smart to wear layers.
End of September
By the end of September, the average daytime temperature in United States will be around 29°C, with nights close to 16°C. A shower might show up, but overall the weather will be dry and sunny.
As it gets cooler in the evening, it’s best to wear layers.
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Precipitation in September
In September, there is an average of 57 mm of precipitation, spread over 6 days. The wind speed is around 4 Bft, mostly coming from the Southeast.
The average precipitation chance is 21% per day this month.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for United States. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
United States in September |
UK | ||
|---|---|---|---|
 Average Temperature |
30°C | 20°C | |
 High Temp |
33°C | 22°C | |
| Low Temp |
26°C | 17°C | |
 Total Precipitation |
57 mm | 44 mm | |
| Rainy Days |
6 days | 8 days | |
August
UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is September a good time to visit the United States?
September is a great month to be in the United States for sunny weather. You’ll get high temperatures and not too much rain this month.
The hurricane season in Alabama runs from June to November.
The hurricane season in Florida runs from June to November.
The hurricane season in Louisiana runs from June to November.
The hurricane season in Mississippi runs from June to November.
The hurricane season in Texas runs from June to November.
Temperature records for the United States in September
With 39°C, the United States hit the highest temperature in the last 10 years in September 2023. The lowest daytime temperature in this month was 14°C in 2014. The extreme night temperatures ranged from a low of 4°C to a high of 26°C.
Check out the climate of the United States for all months and discover the best travel time
The climate of the United States is based on weather data from . Other spots, like New York City, Miami or Los Angeles, might have different weather. You can check out all destinations in the United States for a full picture of the climate.
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Daily Temperature in September in the United States
This chart shows the average daily temperatures, both day and night, for each day in September in the United States, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Weather experiences in September in the United States
Good
California presented no less heat waves, and New York - autu... more
Daily Precipitation in September in the United States
The chart below shows the average daily precipitation in September for the United States, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect around 6 days of rain in the United States.
Daily UV Index in September in the United States
This chart shows the average daily UV index in September in the United States, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in the United States Over the Years
This chart shows the average temperature in September in the United States, measured in degrees Celsius, over the past years.
Total Precipitation in September in the United States Over the Years
This chart shows the average precipitation in September in the United States, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in September for the United States
Click on a specific day in September for detailed info on the typical weather on that day in the United States. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in the United States
The weather in September in the United States is rated 4 out of 5 stars by 1 visitor. Have you been to the United States? Share your weather experience to help other visitors.
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California presented no less heat waves, and New York - autumn days. Warm sunshine and periodic rainfall created a contrasting atmosphere.— This text is automatically translated to English
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Average Weather in the United States by Month
Click on a month below to see detailed weather info for the United States. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of the United States for all months at once
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