Washington weather in May
May in Washington: warm, rainy — one of the best months to visit.
#1 of 12 months in Washington · #49 of 604 destinations to visit in May · comfort 92/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
Washington climate normals — May
| Daytime high | 23°C / 74°F | 🌤 warm |
|---|---|---|
| Nighttime low | 13°C / 56°F | |
| Feels like (high) | 24°C / 75°F | |
| Rainfall | 82 mm / 3.2 in | 🌧 rainy |
| Rainy days | 11 days | |
| Humidity | 69% | 💧 humid |
| Dew point | 12°C / 53°F | |
| Sunshine | 10.2 h/day | |
| Daylight | 14.3 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 54 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Washington in May — FAQ
- Is May a good time to visit Washington?
- May in Washington: warm, rainy — one of the best months to visit. It ranks #1 of 12 months for Washington on SeasonMap's comfort score (92/100).
- What is the weather like in Washington in May?
- In May, Washington averages a daily high of 23.4°C and a low of 13.2°C, with about 81.8 mm of rain over roughly 11.2 rainy days.
- What is the air quality in Washington in May?
- Washington has a mean US Air Quality Index of about 54 in May.