Temperature in The United States of America in September

Daytime highs, nighttime lows and the warmest cities across the United States of America this September.

The United States of America, experiences maximum daytime temperatures in September ranging from 1°C (34°F) in Denali National Park and Preserve to 42°C (108°F) in Furnace Creek. Nighttime temperatures generally drop to 25°C (77°F) in Furnace Creek and -5°C (23°F) in Denali National Park and Preserve.

What is the temperature of the different cities in the United States of America in September?

Find the average daytime temperatures in September for the most popular destinations in the United States of America on the map below. Click on a destination dot for more detailed information.

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Check the conditions for any month of the year.

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For a detailed overview over the year and the best time to visit the United States of America, check out our the United States of America's climate page.

See also: the the United States of America weather by month.

Best Places to Visit in the United States of America in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across the United States of America.

Conditions Temperatures Precipitation
Avg daytime high -5°C (23°F) cold → 32°C (90°F) hot

Marker color shows the average daytime high temperature in September: blue is cold, red is hot.

See all September weather averages, cities and regions in the United States of America

The United States of America temperatures in September: frequently asked questions

How hot does it get in the United States of America in September?

Expect daytime temperatures around 25°C (77°F) in New York City. That makes September a high month for the United States of America.

How cold does it get at night in the United States of America in September?

Nighttime temperatures in New York City typically drop to around 18°C (64°F) in September.

What is the warmest city in September in the United States of America?

Data insights from our comprehensive database indicate that Furnace Creek is the city with the highest warmth. Daytime peaks average near 42°C (108°F), while the nights are characterized by a low temperature close to 25°C (77°F).

What is the coldest city in September in the United States of America?

For the month of September, Denali National Park and Preserve is the most temperate city in the United States of America based on our records. Highs average 1°C (34°F) and nighttime temperatures dip to around -5°C (23°F).

How much sun does the United States of America get in September?

Across the United States of America, sunshine in September ranges from moderately sunny in Annette Island (111 hours) to sunny in Sacramento (347 hours).

What is the water temperature in September?

Across the United States of America, sea temperatures in September range from cold at 14°C (57°F) in San Francisco to warm at 30°C (86°F) in Key West — so swimming conditions depend on which coast you pick.

Interested in more climate information?

We have much more information about the climate in the United States of America.

Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

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