Temperature
Cool by day, cold at night.
61°Ftypical September high
Typical range
September climate
September in Yellowstone National Park
United States · North America
Cool days and plenty of sun.
Excellent time to visit
Daytime high
61°F
Lows around 40°F
Precipitation
10 days/mo
Sun
11 h/day
Air feel
Very dry
When to visit
Month-by-month fit
Best
Precipitation
Some precipitation is expected this month.
33%wet-day frequency
Precip amountWet-day chanceSnowfall
Sunshine
Plenty of sun this month.
10.9 hSeptember sunshine
Heat & humidity by month
Very drySeptember Heat feel
Easy airWarm air
Hourly temperature pattern
In September, afternoons feel about 50° and nights feel near 36°.
FrigidFreezingVery coldColdCoolNight hours
Clear sky
Partly cloudy skies this month.
59%September Clear sky
Clear skyCloud
Wind pattern
Calm winds are typical in September.
6 mphSeptember Light breeze
More detailIncludes daypart comfort
Typical September day
September late afternoons are around 58°F, easing to about 53°F in early evening.
Avg temp Typical range
Morning48°F
Rain16%
Cloud42%
Humid airLow
Sun intensityLow
Midday55°F
Rain22%
Cloud44%
Humid airLow
Sun intensityStrong
Late afternoon58°F
Rain23%
Cloud50%
Humid airLow
Sun intensityModerate
Early evening53°F
Rain16%
Cloud40%
Humid airLow
Sun intensityMinimal
Best windowData tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% |
|---|---|---|---|---|---|---|
| Jan | 22 | 11 | 2.7 | 14 | 6.2 | 80 |
| Feb | 25 | 13 | 2.6 | 13 | 7.7 | 78 |
| Mar | 33 | 20 | 2.9 | 15 | 9.5 | 73 |
| Apr | 40 | 24 | 3.0 | 15 | 10.9 | 71 |
| May | 47 | 29 | 2.8 | 14 | 12.2 | 72 |
| Jun | 60 | 37 | 2.4 | 12 | 13.2 | 65 |
| Jul | 71 | 45 | 1.2 | 8 | 14.1 | 54 |
| Aug | 70 | 46 | 1.6 | 9 | 12.7 | 55 |
| Sep | 61 | 40 | 2.1 | 10 | 10.9 | 61 |
| Oct | 45 | 30 | 2.7 | 12 | 8.8 | 72 |
| Nov | 32 | 20 | 2.7 | 12 | 7.0 | 81 |
| Dec | 22 | 12 | 3.1 | 14 | 5.7 | 82 |
Similar climates
Similar
Similar travel styleGlacier National ParkUnited StatesSimilar travel styleAnchorageUnited StatesSimilar travel styleJackson HoleUnited StatesSimilar travel styleHunza ValleyPakistan
Want a side-by-side climate view? Compare Yellowstone National Park with Glacier National Park.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jun 1, 2026
Data & methodology