Washington DC Weather in May
United States · Humid Subtropical climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
May in Washington DC sees average temperatures ranging from a low of 12.3°C (54.1°F) to a high of 23.1°C (73.6°F), with a mean of 17.5°C (63.5°F). Compared to the annual average of 14.2°C (57.6°F), this month is 3.3°C warmer than the yearly norm. Precipitation averages 106.2mm, making it approximately 12.0mm drier than the monthly average of 119.0mm. The city receives an average of 9.8 hours of sunshine per day during May, with relative humidity averaging 68.9%. Wind speeds reach an average maximum of 16.6 km/h. For travelers, this month offers a temperature experience in Washington DC, with drier-than-average conditions compared to the rest of the year.
There's something about Washington DC in late March when the cherry blossoms peak that turns the political city into something tender. I stood at the Tidal Basin one spring as 3,000 trees bloomed pink against the Jefferson Memorial — the data says peak bloom is usually the last week of March to first week of April, around 15°C. Summer (June-August) is famously brutal: 30°C with 70% humidity, the kind that makes the National Mall feel like a sauna. October is DC's secret weapon: 18°C, golden leaves along the Mall, and the cultural season reopening. Winter is quieter and the museums are empty — a trade-off worth making.
May vs Adjacent Months
| Metric | April | May | June |
|---|---|---|---|
| Mean Temp | 13.1°C (55.6°F) | 17.5°C (63.5°F) | 23.2°C (73.8°F) |
| Rainfall | 105.3mm | 106.2mm | 125.1mm |
| Sunshine | 9.2 hrs | 9.8 hrs | 11.6 hrs |
| Humidity | 63.7% | 68.9% | 66.3% |
| Wind | 19.6 km/h | 16.6 km/h | 16.0 km/h |
| Rainy Days | 15.8 | 16.8 | 15.4 |
Seasonal Context
May falls in Spring in the Northern Hemisphere. Spring is a transitional season with temperatures rising from winter lows. For travelers visiting Washington DC in May, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Washington DC in May?
The average temperature in Washington DC during May ranges from 12.3°C (54.1°F) to 23.1°C (73.6°F), with a mean of 17.5°C (63.5°F).
How much does it rain in Washington DC in May?
Washington DC receives an average of 106.2mm of precipitation in May, spread across approximately 16.8 rainy days.
What should I pack for Washington DC in May?
Based on May weather data, pack layers including light jackets and t-shirts, plus an umbrella. Rain gear is essential — this month averages 106.2mm of precipitation.
Is May a good time to visit Washington DC?
May is a month with challenging conditions. Plan activities carefully and stay hydrated.
Other Months for Washington DC
Cities with Similar May Climate (Humid Subtropical)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 38.9°, -77.04°. Timezone: America/New_York. Last updated: 2026-07-30.