The weather in September in the United States
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.
September is a good month to be in the United States for sunny weather. You’ll have high temperatures and not too much rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for the United States. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 39°C in 2023, the United States reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 14°C in 2014. The extreme nighttime temperatures ranged from a lowest recorded value of 4°C to a highest value of 26°C.
Rainfall amount
In September, there is an average of 57 mm of precipitation, spread over 9 days. The wind speed is around 4 Bft, mostly coming from the Southeast.
Daily weather in September for the United States
Click on any day in September to get detailed info about the usual weather on that day in the United States. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| United States | New York | |
|---|---|---|
| Average temperature | 30°C | 27°C |
| Max. temperature | 33°C | 31°C |
| Min. temperature | 13°C | -5°C |
| Total precipitation | 57 mm | 57 mm |
| Rainy days | 9 days | 9 days |
Start of September
The month of September starts in United States with hot temps, averaging around 32°C during the day and nights around 20°C.
Mid September
By mid-September, daytime temps drop to around 30°C, with nights around 18°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of September
By the end of September, the average daytime temperature in United States is around 29°C, while nighttime temps are about 16°C. A shower might pop up, but overall, the weather will be dry and sunny.
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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.
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.
Check out the climate of the United States for all months and discover the best travel time
The climate in the United States is based on weather data from . Other places, like New York City, Miami or Los Angeles, might have different weather. You can check out all destinations in the United States to get the full picture of the climate.
Temperature charts
These charts show the average temperatures in September in the United States. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in the United States
Temperature in September in the United States over the years
Precipitation charts
These charts show the average amount of precipitation in September in the United States. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in the United States
Total precipitation in September in the United States over the years
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.
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.