Olympic National Park weather in May
May in Olympic National Park: cold, rainy, with clean air — a great time to visit.
#5 of 12 months in Olympic National Park · #381 of 604 destinations to visit in May · comfort 78/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Olympic National Park climate normals — May
| Daytime high | 11°C / 51°F | 🧥 cold |
|---|---|---|
| Nighttime low | 2°C / 35°F | |
| Feels like (high) | 9°C / 48°F | |
| Rainfall | 115 mm / 4.5 in | 🌧 rainy |
| Rainy days | 16 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 1°C / 34°F | |
| Sunshine | 11.1 h/day | |
| Daylight | 15.2 h | |
| Wind | 10 km/h / 6 mph | |
| Snowfall | 9.3 cm / 3.7 in | |
| Air quality (US AQI) | 37 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Olympic National Park?
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Olympic National Park in May — FAQ
- Is May a good time to visit Olympic National Park?
- May in Olympic National Park: cold, rainy, with clean air — a great time to visit. It ranks #5 of 12 months for Olympic National Park on SeasonMap's comfort score (78/100).
- What is the weather like in Olympic National Park in May?
- In May, Olympic National Park averages a daily high of 10.7°C and a low of 1.8°C, with about 114.8 mm of rain over roughly 16.2 rainy days.
- What is the air quality in Olympic National Park in May?
- Olympic National Park has a mean US Air Quality Index of about 37 in May.
- Does it snow in Olympic National Park in May?
- Olympic National Park sees roughly 9.3 cm of snowfall in May.