North Cascades National Park weather in May
May in North Cascades National Park: cold, rainy, with clean air — a great time to visit.
#5 of 12 months in North Cascades National Park · #419 of 604 destinations to visit in May · comfort 75/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
North Cascades National Park climate normals — May
| Daytime high | 6°C / 42°F | 🧥 cold |
|---|---|---|
| Nighttime low | -3°C / 26°F | |
| Feels like (high) | 3°C / 37°F | |
| Rainfall | 98 mm / 3.9 in | 🌧 rainy |
| Rainy days | 17 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | -3°C / 26°F | |
| Sunshine | 10.3 h/day | |
| Daylight | 15.3 h | |
| Wind | 8 km/h / 5 mph | |
| Snowfall | 12.2 cm / 4.8 in | |
| Air quality (US AQI) | 41 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is North Cascades National Park?
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North Cascades National Park in May — FAQ
- Is May a good time to visit North Cascades National Park?
- May in North Cascades National Park: cold, rainy, with clean air — a great time to visit. It ranks #5 of 12 months for North Cascades National Park on SeasonMap's comfort score (75/100).
- What is the weather like in North Cascades National Park in May?
- In May, North Cascades National Park averages a daily high of 5.6°C and a low of -3.4°C, with about 98.2 mm of rain over roughly 16.6 rainy days.
- What is the air quality in North Cascades National Park in May?
- North Cascades National Park has a mean US Air Quality Index of about 41 in May.
- Does it snow in North Cascades National Park in May?
- North Cascades National Park sees roughly 12.2 cm of snowfall in May.