Katmai National Park weather in May

May in Katmai National Park: cold, rainy, with clean air — a great time to visit.

#4 of 12 months in Katmai National Park · #361 of 604 destinations to visit in May · comfort 79/100 (tier B)

Updated June 2026 · climate normals from ERA5 reanalysis

Katmai National Park climate normals — May

Daytime high8°C / 47°F🧥 cold
Nighttime low3°C / 37°F
Feels like (high)7°C / 45°F
Rainfall108 mm / 4.3 in🌧 rainy
Rainy days16 days
Humidity84%💦 very humid
Dew point2°C / 35°F
Sunshine9.9 h/day
Daylight16.8 h
Wind10 km/h / 6 mph
Snowfall44 cm / 17.3 in
Air quality (US AQI)32🍃 good

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Where is Katmai National Park?

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Katmai National Park in May — FAQ

Is May a good time to visit Katmai National Park?
May in Katmai National Park: cold, rainy, with clean air — a great time to visit. It ranks #4 of 12 months for Katmai National Park on SeasonMap's comfort score (79/100).
What is the weather like in Katmai National Park in May?
In May, Katmai National Park averages a daily high of 8.4°C and a low of 2.8°C, with about 108.3 mm of rain over roughly 16 rainy days.
What is the air quality in Katmai National Park in May?
Katmai National Park has a mean US Air Quality Index of about 32 in May.
Does it snow in Katmai National Park in May?
Katmai National Park sees roughly 44 cm of snowfall in May.

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