United States in september: average Weather, Temperature and Climate, Where to go?
Weather in the United States (USA) in september 2025
Here, you have access to the weather forecast for the month of september for most popular cities in United States. These forecasts are statistics for the month of september from weather reports for many years. The percentage indicates the possibility of having the weather mentioned.
Average weather in september in California
good weather UV index: 8
Weather at 6am
72°F
Clear/Sunny
92% of time
7%
2%
1%
Weather at 12pm
97°F
Clear/Sunny
91% of time
9%
1%
1%
Weather at 6pm
83°F
Clear/Sunny
90% of time
6%
3%
1%
Weather at 3am
67°F
91%
6%
4%
1%
More information about the weather in California in september
Where to go in the United States (USA) in september?
Where to go in the United States (USA) in september: destination map
Where to go in each region in september?
| Alaska (Anchorage, Fairbanks, Ketchikan...) | 36°F to 58°F | 2 à 15 days | 45°F to 56°F | very bad weather* |
| California (Los Angeles , San Francisco, San Diego...) | 67°F to 99°F | 0 à 3 days | 54°F to 68°F | perfect weather* |
| Florida (Miami, Orlando, Key West...) | 86°F to 90°F | 8 à 20 days | 85°F to 86°F | tolerable weather* |
| Hawaii (Honolulu (Oahu), Kauai (Garden Isle), Maui...) | 72°F to 85°F | 1 à 11 days | 81°F to 83°F | good weather* |
| Louisiana (New Orleans, Baton Rouge, Shreveport...) | 86°F to 90°F | 4 à 11 days | 85°F | good weather |
| Midwest (Chicago, Minneapolis (Minnesota), Detroit...) | 72°F to 85°F | 3 à 8 days | 70°F to 72°F | good weather |
| Northeastern Coast of United States (Washington D. C., New York City, Boston...) | 68°F to 83°F | 2 à 7 days | 58°F to 76°F | good weather* |
| Northwest Coast of United States (Seattle, Portland, Long Beach (Washington)...) | 63°F to 77°F | 2 à 7 days | 54°F to 58°F | good weather* |
| Rocky Mountains (Las Vegas, Salt Lake City, Yellowstone National Park...) | 59°F to 99°F | 0 à 7 days | perfect weather* | |
| South East of United States (Atlanta, Myrtle Beach, Nashville...) | 79°F to 88°F | 4 à 12 days | 79°F to 85°F | good weather |
| South West of United States (Dallas, Grand Canyon, Phoenix (Arizona)...) | 76°F to 103°F | 1 à 13 days | 85°F to 86°F | good weather* |
Where should you go in the United States (USA) in september when it comes to the weather?
Remember:
The climate in the United States (USA) in september ranges from perfect to very bad depending on the region and city.
In september the weather is just perfect in United States, but only part of the territory: in Hollywood, Grand Canyon, Santa Monica, Napa Valley, San Francisco, Albuquerque, Moab, Las Vegas, Santa Barbara, Tucson, Palm Springs, Los Angeles (California), San Diego, Salt Lake City and Sacramento. In these cities, these perfect weather conditions will allow you to enjoy 100% your holidays: the sun is here, rainfall is scarce and the humidity is not too high. It is therefore the ideal month to visit these cities!
Please note that the weather is still favorable in Hampton Beach, Kansas, Massachusetts, Montana, Utah, Joshua Tree National Park, Louisiana, New York City, Virginia Beach, Detroit, Mobile (Alabama), Rhode Island, New Orleans, Austin, Dallas, Wyoming, Oklahoma, Santa Fe (New Mexico), Seattle, Philadelphia, Yosemite National Park, Wildwood, Atlanta, Houston, North Carolina, Monument Valley, Connecticut, Salem, Cleveland, Hawaii (Honolulu), Jacksonville, Chicago, Wisconsin, Washington D. C., South Carolina, Myrtle Beach, Reno, Illinois, Louisville (Kentucky), North Dakota, Minneapolis, Phoenix (Arizona), Missouri, Mississippi, Vermont, Virginia, Nashville, Zion National Park, Maryland, Denver, Arkansas, Yellowstone National Park, Death Valley National Park, Maine, Niagara Falls, Portland, Boston, New Jersey, Jackson Hole and Lake Tahoe. In these areas, temperatures are still attractive and allow you enjoy the sun and sightseeing in good conditions.
If you do not go for the sun or the beach, but, for example to go sightseeing around, the cities of Fort Lauderdale, Anchorage, Tampa, Key West, Miami (Florida) and Orlando have a ok but correct weather for this kind of activity in september. Finally, avoid going in Alaska in september because the climate is bad.
Climate in the United States (USA) in september
Climate in California in september
In the month of september, maximum temperature is 99°F and minimum temperature is 72°F (for an average temperature of 85°F). The climate is pleasant in that locality in september. It almost never rains during the month of september. You will therefore be at the shelter from rain for your vacations!
With ideal weather conditions, september is an advisable time to go in California in United States.
| September | |||
| Average temperature | 85°F | ||
| Highest temperature | 99°F | ||
| Lowest temperature | 72°F | ||
| Sea temperature | 67°F | ||
| Rainfall | 0.3in | ||
| Number of days with rainfall | 0 day(s) (1%) | ||
| Humidity | 45% | ||
| Daily sunshine hours | 13 | ||
| Cloud cover | 5% | ||
| Length of day | 12:24 | ||
| Our opinion at whereandwhen.net | good |
Climate in Louisiana in september
In september, maximum temperature is 88°F and minimum temperature is 70°F (for an average temperature of 79°F). The climate is very hot in that locality in the month of september. With 7in over 9 days, you risk getting wet slightly for your vacations. But this is pretty moderate and it is only of temporary showers.
With a good weather, september is a recommended month to go in Louisiana.
| September | |||
| Average temperature | 79°F | ||
| Highest temperature | 88°F | ||
| Lowest temperature | 70°F | ||
| Rainfall | 7in | ||
| Number of days with rainfall | 9 day(s) (31%) | ||
| Humidity | 92% | ||
| Daily sunshine hours | 12 | ||
| Cloud cover | 34% | ||
| Length of day | 12:21 | ||
| Our opinion at whereandwhen.net | good |
Climate in Washington D. C. in september
In september, maximum temperature is 83°F and minimum temperature is 67°F (for an average temperature of 74°F). The climate quite enjoyable there in this month. With 4.7in over 6 days, rain may occur for your trip. But this is rather moderate and you will not be too bothered by it.
With a good climate, the month of september is a good time to go in Washington D. C. in United States.
| September | |||
| Average temperature | 74°F | ||
| Highest temperature | 83°F | ||
| Lowest temperature | 67°F | ||
| Sea temperature | 75°F | ||
| Rainfall | 4.7in | ||
| Number of days with rainfall | 6 day(s) (19%) | ||
| Humidity | 83% | ||
| Daily sunshine hours | 12 | ||
| Cloud cover | 35% | ||
| Length of day | 12:26 | ||
| Our opinion at whereandwhen.net | good |
Climate in Alaska in september
In the month of september, the mean temperature in Alaska is 43°F (maximum temperature is 50°F and minimum temperature is 38°F). The climate is relatively fresh in that locality in the month of september, but it is tolerable by dressing hot. With 2.9in over 4 days, rain may occur for your journey. But this is pretty reasonably and you will not be too bothered by it.
| September | |||
| Average temperature | 43°F | ||
| Highest temperature | 50°F | ||
| Lowest temperature | 38°F | ||
| Rainfall | 2.9in | ||
| Number of days with rainfall | 4 day(s) (14%) | ||
| Humidity | 91% | ||
| Daily sunshine hours | 11 | ||
| Cloud cover | 51% | ||
| Length of day | 13:00 | ||
| Our opinion at whereandwhen.net | very bad |
Climate in Atlanta in september
In the month of september, the mean temperature in Atlanta is 77°F (maximum temperature is 86°F and minimum temperature is 68°F). The climate nice in this location in the month of september. With 3.3in over 5 days, you risk getting wet slightly for your vacations. But this is pretty reasonably and it will not be continuous.
With good weather conditions, september is a recommended month to go in this locality in United States.
| September | |||
| Average temperature | 77°F | ||
| Highest temperature | 86°F | ||
| Lowest temperature | 68°F | ||
| Rainfall | 3.3in | ||
| Number of days with rainfall | 5 day(s) (16%) | ||
| Humidity | 84% | ||
| Daily sunshine hours | 11 | ||
| Cloud cover | 31% | ||
| Length of day | 12:22 | ||
| Our opinion at whereandwhen.net | good |
All cities in the United States (USA) in september
| California in september | good weather |
| Louisiana in september | good weather |
| Washington D. C. in september | good weather |
| Alaska in september | very bad weather |
| Atlanta in september | good weather |
| Boston in september | good weather |
| Chicago in september | good weather |
| Dallas in september | good weather |
| Grand Canyon in september | perfect weather |
| Hawaii (Honolulu) in september | perfect weather |
| Las Vegas in september | perfect weather |
| Miami (Florida) in september | tolerable weather |
| New York City in september | good weather |
| Salt Lake City in september | good weather |
| Seattle in september | perfect weather |
| Yellowstone National Park in september | very bad weather |
| Austin in september | good weather |
| Denver in september | perfect weather |
| Detroit in september | good weather |
| Houston in september | good weather |
| Long Beach (Washington) in september | good weather |
Weather data for United States in september:
Weather data for United States in september is derived from an average of the weather forecast since 2009 in the United States (USA). There is a margin of error and these forecasts are to be considered as general information only. The weather in the United States (USA) can vary slightly from year to year, but these predictions should limit surprises. So you can pack your bags and check when is the best time to go to the United States (USA).