Yellowstone National Park in May
In May, Yellowstone National Park averages a high of 51°F and a low of 26°F, with 2.4 inches of precipitation (rain plus melted snow). About 514,000 people visit, the 5th busiest of 12 (moderate). Days are 14 hours 47 minutes long.
- Quiet
- Moderate
- Busy
- Very busy
- Few or no visits (may be closed)
- Best months
- High / low
- 51° / 26°F
- Precipitation
- 2.4in
- Snow
- –in
- Daylight
- 14h 47m
- Visitors
- 514,000
- Crowds
- Moderate
Best months for weather and crowds instead: July (very busy), August (very busy) and September (very busy).
Higher or lower in the park, expect a different picture: Gardiner, MT at 5,275 ft averages a May high of 67°F and a low of 39°F.
Weather 1991–2020 averages at Yellowstone Lake, WY, 4.3 miles from the park's center, 7,835 ft. Second station lower down: Gardiner, MT, 5,275 ft, 32.7 miles. Visitors National Park Service recreation visits, average of 2023–2025. Updated .
Other parks in May
| Park | High / low °F | Crowds | Weather |
|---|---|---|---|
| John D. Rockefeller, Jr., Memorial Parkway | 56° / 28° | Moderate | Mild |
| Grand Teton National Park | 56° / 31° | Moderate | Mild, wet |
| Glacier National Park | 64° / 39° | Quiet | Mild, wet |
| Mount Rushmore National Memorial | 60° / 42° | Moderate | Mild, wet |
| Wind Cave National Park | 66° / 41° | Busy | Mild, wet |
Closures, reservations and alerts: Yellowstone National Park on nps.gov
All twelve months at Yellowstone · National parks to visit in May