Washington D.C., District of Columbia weather in May

Averages from 2021–2025 (155 days of record).

Average high: 74°F
Average low: 55°F
Rainy days: ~12 per month
Total precipitation: 5.5 in
Warmest recorded: 94°F
Coldest recorded: 40°F

Expect May days in Washington D.C., District of Columbia to top out around 74°F and cool to about 55°F overnight, with roughly 12 days of measurable rain across the month. In recent years May has ranged from 40°F to 94°F.

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Current Washington D.C., District of Columbia forecast → · Historical data by Open-Meteo (ERA5).