Where to Go for Great Weather
United States · Month guide

United States in September

Around 26 °C with 78 mm of rain and 7.1 hours of sun a day.

September is one of the strongest months to visit United States. Around 26 °C with 78 mm of rain and 7.1 hours of sun a day. Use the regional grid below to find where this month works best — national averages hide the swings between coast, highlands, and inland.

Plan a trip in September← United States year-round
Match verdictMatch: Perfect match. United States · September.
Perfect match
United States · September
What the weather usually does

United States · typical month

  • Day / night
    15 – 26 °C
    Year range -3 – 30 °C
  • Rainfall
    78 mm
    Year range 66 – 101 mm
  • Sunshine
    7.1 hr / day
    Year range 4.6 – 8.4 hr / day
Compare with another destination
What’s open · September

Things to do in United States in September

Nothing is closed in September, and 1 thing below is at its best.

  • At its best
    Tioga Road, Yosemite

    reliably open and clear of snow

    Sources: nps.gov, nps.gov

  • Open
    Glacier Point Road, Yosemite

    Source: nps.gov

Opening seasons are checked by hand against the operators and parks themselves, not derived from the climate figures on this page. Last reviewed 2026-08-28. Dates move — confirm before you book.

51 regions · current month

United States, taken apart

Safety · 4 governments

What the governments say about United States

Combined advisory · most-cautious-wins
Exercise normal precautions
Highest level across 4 governments · Advisory last changed
See breakdown by country
AU

Exercise normal precautions

Changed Checked www.smartraveller.gov.au
CA

Exercise normal precautions

Changed Checked travel.gc.ca
DE

Exercise normal precautions

Changed Checked www.auswaertiges-amt.de
Climate at a glance · 10-year ERA5

A decade of weather, in one page

Temperature°C
Temperature · 12-month climatologyUnited States. Average daytime high by month in °C. Lowest in January (5.2), highest in July (29.8). Monthly means: 5.2, 7.8, 12.5, 17.4, 22.4, 27.5, 29.8, 28.8, 25.7, 19.4, 12.3, 7.3.
— daytime high— overnight low▬ typical range
View data table
MonthAverage daytime high (°C)Average overnight low (°C)Typical lowTypical high
January5.2-3.4-13.312.9
February7.8-1.9-11.316.8
March12.52.2-5.920.4
April17.46.3-0.924.6
May22.411.75.529.0
June27.516.611.632.5
July29.819.215.633.5
August28.818.214.033.0
September25.714.99.031.2
October19.48.81.126.6
November12.32.7-4.920.8
December7.3-1.3-10.115.0
Rainfallmm
Rainfall · 12-month climatologyUnited States. Rainfall by month in mm. Lowest in November (66), highest in May (101). Monthly means: 78, 77, 87, 93, 101, 88, 93, 90, 78, 80, 66, 84.
View data table
MonthRainfall (mm)
January78
February77
March87
April93
May101
June88
July93
August90
September78
October80
November66
December84
Sunshinehr / day
Sunshine · 12-month climatologyUnited States. Sunshine hours by month in hr / day. Lowest in December (4.6), highest in June (8.4). Monthly means: 5.2, 6.1, 7.0, 7.6, 7.6, 8.4, 8.3, 7.6, 7.1, 6.3, 5.5, 4.6.
View data table
MonthSunshine hours (hr / day)
January5.2
February6.1
March7.0
April7.6
May7.6
June8.4
July8.3
August7.6
September7.1
October6.3
November5.5
December4.6
Windkm/h
Wind · 12-month climatologyUnited States. Average wind speed by month in km/h. Lowest in August (9.6), highest in March (13.2). Monthly means: 12.5, 12.8, 13.2, 13.1, 11.6, 10.9, 9.6, 9.6, 10.4, 11.7, 12.1, 12.2.
— average▬ typical range
View data table
MonthAverage wind speed (km/h)Typical lowTypical high
January12.56.920.1
February12.87.520.2
March13.27.621.0
April13.17.820.8
May11.67.018.0
June10.96.616.7
July9.66.314.1
August9.66.114.3
September10.46.316.2
October11.76.718.8
November12.16.919.3
December12.26.920.1
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← Earlier
August

Around 29 °C with 90 mm of rain and 7.6 hours of sun a day.

Later →
October

Around 19 °C with 80 mm of rain and 6.3 hours of sun a day.

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