Average weather for the United States 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.
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. A few showers might pop up early in the month, but overall, it’ll stay mostly sunny and dry.
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.
Since it cools down at night, it’s a good idea to wear layers.
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.
Because temperatures drop in the evening, wearing layers is recommended.
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.
United States in September |
New York | ||
|---|---|---|---|
 Average temperature |
30°C | 27°C | |
 Max. temperature |
33°C | 31°C | |
| Min. temperature |
26°C | -5°C | |
 Total precipitation |
57 mm | 57 mm | |
| Rainy days |
6 days | 9 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 good month to be in the United States for sunny weather. You’ll have high temperatures and not too much rain.
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
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.
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.
Daily Temperature in September in the United States
This chart shows the average daily high and low temperatures in September for the United States, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for 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 millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed 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 it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for September, you can expect about 6 days of precipitation 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 few 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 millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
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.
Weather experiences in September in the United States
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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
States of the USA
