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Best time to visit · Wyoming, United States
For the most comfortable weather in Yellowstone National Park, aim for July – September. July tops our comfort score at 97/100, with highs around 72°F (22°C) and 1.5 in (37 mm) of rain. June is a good shoulder-season month. The toughest months are February & March and December, mainly because of cool days.
Highs run from 19°F to 72°F across the year, and the yearly total is about 32.8 in (834 mm) of rain and snow.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high | 20°F-7°C | 21°F-6°C | 28°F-2°C | 36°F2°C | 49°F10°C | 61°F16°C | 72°F22°C | 71°F22°C | 61°F16°C | 43°F6°C | 28°F-2°C | 19°F-7°C |
| Avg low | 1°F-17°C | 2°F-17°C | 10°F-12°C | 18°F-8°C | 29°F-2°C | 37°F3°C | 46°F8°C | 44°F7°C | 35°F1°C | 23°F-5°C | 10°F-12°C | 1°F-17°C |
| Rain/snow | 3.2 in81 mm | 3.0 in75 mm | 3.0 in77 mm | 3.2 in82 mm | 3.2 in81 mm | 2.8 in70 mm | 1.5 in37 mm | 1.6 in40 mm | 2.0 in52 mm | 2.7 in69 mm | 3.1 in79 mm | 3.6 in91 mm |
| Humidity | 98% | 99% | 97% | 89% | 76% | 70% | 59% | 53% | 58% | 73% | 91% | 98% |
| Cloud | 75% | 77% | 77% | 73% | 73% | 58% | 39% | 43% | 48% | 64% | 73% | 77% |
| Comfort | 40 | 40 | 40 | 41 | 55 | 81 | 97 | 96 | 86 | 50 | 41 | 38 |
Source: NASA POWER (public domain), 2001–2025 monthly averages on a ~50 km satellite and reanalysis grid, so coasts and valleys can differ from what's shown. The grid cell sits at about 2,437 m (7,996 ft), close to Yellowstone National Park's own ~2,458 m. Precipitation includes snow as melted water; daylight is calculated from latitude. Check a forecast before you go.
The cold peaks here: highs of 19–21°F (-7–-6°C), and nights reach 1°F (-17°C). It's the wettest season, with about 9.7 in (247 mm) of rain or snow, 30% of the year's total. December – February are cold enough for snow. Comfort scores bottom out in February and December; the season averages 39/100.
Temperatures climb through the season, from 28°F highs in March to 49°F by May. About 9.4 in (240 mm) of rain or snow falls across these months, 29% of the year's total. March & April are cold enough for snow. It holds the toughest stretch on our comfort score (March), averaging 45/100.
Peak warmth: highs of 61–72°F (16–22°C). It's the driest season, with only about 5.8 in (147 mm) of rain, 18% of the year's total. Lows bottom out around 37°F (3°C). July & August are among the best-scoring months (season average 91/100).
Temperatures slide from 61°F highs in September to 28°F by November. About 7.9 in (200 mm) of rain or snow falls across these months, 24% of the year's total. October & November are cold enough for snow. Comfort peaks here: September ranks with the year's best, and the season averages 59/100.
By comfort score: 4 Great, 2 Fair and 6 Tough. Great months: June – September. Tap a month for its own guide.
For the most comfortable weather in Yellowstone National Park, aim for July – September. July tops our comfort score at 97/100, with highs around 72°F (22°C) and 1.5 in (37 mm) of rain. June is a good shoulder-season month. The toughest months are February & March and December, mainly because of cool days.
December is the wettest month, averaging about 3.6 in (91 mm) of rain or snow. July is the driest, with about 1.5 in (37 mm). The yearly total is around 32.8 in (834 mm).
December is the coldest, with average lows of 1°F (-17°C) and highs of 19°F (-7°C). The warmest is July, with average highs of 72°F (22°C).
Not very: summer (June – August) humidity averages 61%, and highs peak around 72°F (22°C), so it rarely feels sticky.
On average, yes: lows fall below 32°F (0°C) in October – May, bottoming out around 1°F (-17°C) in December.
Poll the group on July – September dates, then plan the days, packing and costs together.
