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.
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.
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Pick a month to see the average temperature, rainfall and sunshine in Yellowstone National Park - and find the best time to visit.
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).
45-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
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.
Based on 23 years of weather observations (2003-2026), these are the most extreme conditions recorded in Yellowstone National Park.
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 is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
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.
We rated the following activities from 1 (least suitable) to 10 (best) to do.
See the full Yellowstone National Park climate overview or explore weather in the United States of America.
Where to go in May - average daytime high across popular destinations.
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