Yellowstone National Park Weather in May
May in Yellowstone National Park typically sees daytime highs of 12°C (54°F) and nighttime lows of -3°C (27°F). Rainfall is also possible this month, so it's worth packing an umbrella.
Rainfall in Yellowstone National Park in May
Based on our climate data of the past 30 years, about 15 days of snow/rain are anticipated, with 66 mm (2.6 in) on average. Rain falls on many days this month, but usually in relatively small amounts. A light waterproof is more useful than a heavy umbrella.
Temperature in Yellowstone National Park in May
May in Yellowstone National Park brings low temperatures, with highs of 12°C (54°F) and nights around -3°C (27°F). Cold conditions persist throughout the day, so warm clothing is important from the moment you head outside. With lows of -3°C (27°F), nights are freezing. Packing a spare blanket is worth considering if you're staying somewhere that might not be fully heated.Our weather planner can help you find worldwide destinations with pleasant weather during this period. July and August typically offer the best weather for Yellowstone National Park.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Yellowstone National Park's climate page.
Yellowstone National Park Temperature in May
Min Temperature
-3°C (27°F)
Max Temperature
12°C (54°F)
Chance of Rain
50%
Precipitation
66 mm (2.6 in)
Rainy days
15 days
Daily Historical Temperatures
45-year average (1976-2025)
Based on our historical records, temperatures in Yellowstone National Park typically rise from around 8°C (46°F) at the start of May to approximately 13°C (55°F) by the end. Nights are very cold, with lows typically ranging from -5°C (23°F) to 0°C (32°F).
Average temperatures in May
Daily Historical Precipitation
45-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather for Yellowstone National Park in May
Browse day-by-day weather records for Yellowstone National Park spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Yellowstone National Park historical weather extremes in May
Based on 22 years of weather observations (2003-2025), these are the most extreme conditions recorded in Yellowstone National Park.
- Yellowstone National Park recorded its highest May temperature of 26°C (79°F) on May 31, 2025.
- The lowest daytime temperature in May was -3°C (27°F), recorded on May 9, 2022.
- The coldest night in May in Yellowstone National Park was on May 7, 2010, with a minimum of -18°C (0°F).
- The heaviest May precipitation occurred on May 23, 2018, when 28 mm (1.1 in) of precipitation fell.
Best Places in the United States of America in May
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in May →
perfect weather
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What to Wear in Yellowstone National Park in May
The weather can swing between comfortable and chilly in May, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. Wet weather is likely, so pack waterproof gear for multiple rainy days.What To Do in Yellowstone National Park in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Yellowstone National Park's climate page.
See the full Yellowstone National Park climate overview or explore weather in the United States of America.
