Yellowstone weather
in May
“Cool and moody. Best paired with warm rooms and long lunches.”
Roughly 13 rainy days across the month, on average.
In may, Yellowstone settles into its cold, contemplative stillness. The city keeps a different pulse than in summer or midwinter, and travellers who arrive with the right expectations are rewarded.
Days average around 9°C (47°F), cooling to -2°C after sunset. Rainfall is moderate — around 13 rainy days spread through the month. Long days of sunshine reward early starts.
These figures are climatological averages, drawn from a decade of daily records via the Open-Meteo Archive — not a forecast. But they are honest, and they are the sort of thing a good travel guide ought to tell you before you book the flight.
What to pack for Yellowstone in May
- •A properly warm coat — not a fashion piece
- •A merino base layer for the cold evenings
- •Comfortable, broken-in walking shoes
- •A small daypack that won't look like a tourist beacon
What to pack for Yellowstone in May
- →Lightweight fleeceAmazon · shop this
- →Merino travel socksAmazon · shop this
- →Compact travel umbrellaAmazon · shop this
- →Reef-safe sunscreen SPF 50Amazon · shop this
- →Polarized sunglassesAmazon · shop this
- →Universal travel adapterAmazon · shop this
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Where to stay in Yellowstone
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Yellowstone in May — FAQ
Q01Is May a good time to visit Yellowstone?
Is May a good time to visit Yellowstone?
It is a fair time to visit — expect variable conditions and plan flexibility. In May, Yellowstone averages a high of 9°C (47°F) and a low of -2°C (29°F), with 56mm of rainfall across roughly 13 rainy days.
Q02What is the average temperature in Yellowstone in May?
What is the average temperature in Yellowstone in May?
The average high temperature in Yellowstone during May is 9°C (47°F), with an average low of -2°C (29°F). These figures are averaged from ten years of daily records (2015–2024, Open-Meteo Archive).
Q03How many rainy days does Yellowstone have in May?
How many rainy days does Yellowstone have in May?
Yellowstone averages approximately 13 rainy days in May, with a total monthly rainfall of about 56mm. This is based on daily precipitation records where days with 1mm or more of rain are counted as rainy days.
Q04What should I pack for Yellowstone in May?
What should I pack for Yellowstone in May?
For Yellowstone in May, pack a warm winter coat, a merino base layer for evenings, comfortable walking shoes. These recommendations are based on the ten-year weather averages for this specific month.
Q05How crowded is Yellowstone in May?
How crowded is Yellowstone in May?
Tourist crowds in Yellowstone during May are typically moderate. Consider this when planning accommodation — prices track crowd levels closely.