Climate averages 1991–2020
Germantown weather
in May.
A warm, wet month: the 5th warmest and the joint 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a warm month in Germantown: daytime highs average 22.6°C and nights cool to about 12.5°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 97 mm of rain on roughly 12 days, which makes May a wet month (the joint 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 18 min on an average May day.
The nearest other city in this atlas is Silver Spring (29 km away). In May its highs average 22.9°C, about as warm as Germantown, with 95 mm of rain.
Among the 498 cities listed in the United States, Germantown ranks joint 274th of 498 for the warmest May highs and joint 347th of 498 for the driest May (rainfall, lowest first). The mean May high of those 498 cities is 23.8°C; Germantown is 1.1°C cooler than that mean.
From May to June, average highs rise by 5.0°C to 27.6°C, and monthly rainfall falls from 97 mm to 90 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Germantown climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.7°C-3.1°C | -3.1°C | 78 | 8.6 | 9.810 h |
| February | 6.6°C-2.5°C | -2.5°C | 71 | 8.4 | 10.711 h |
| March | 11.2°C1.2°C | 1.2°C | 97 | 10.2 | 11.912 h |
| April | 17.7°C6.8°C | 6.8°C | 87 | 10.4 | 13.213 h |
| May, selected | 22.6°C12.5°C | 12.5°C | 97 | 11.5 | 14.314 h |
| June | 27.6°C17.6°C | 17.6°C | 90 | 10.8 | 14.915 h |
| July | 30.1°C20.4°C | 20.4°C | 102 | 11.2 | 14.615 h |
| August | 29.0°C19.6°C | 19.6°C | 85 | 10.4 | 13.714 h |
| September | 25.1°C16.0°C | 16.0°C | 113 | 9.3 | 12.512 h |
| October | 18.6°C9.7°C | 9.7°C | 87 | 7.8 | 11.211 h |
| November | 12.1°C3.9°C | 3.9°C | 76 | 7.7 | 10.110 h |
| December | 6.8°C-0.6°C | -0.6°C | 89 | 8.8 | 9.59 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Silver Spring in MayUnited States · 29 kmHigh 22.9°C · Low 12.9°C · 95 mm rain
- Arlington (Virginia), United States in MayUnited States · 36 kmHigh 23.1°C · Low 12.9°C · 95 mm rain
- Washington in MayUnited States · 37 kmHigh 23.7°C · Low 13.3°C · 95 mm rain
- Columbia (Maryland), United States in MayUnited States · 38 kmHigh 22.1°C · Low 12.9°C · 97 mm rain
- Centreville in MayUnited States · 39 kmHigh 23.0°C · Low 13.3°C · 95 mm rain
- Alexandria, United States in MayUnited States · 45 kmHigh 23.5°C · Low 13.6°C · 91 mm rain
- Baltimore in MayUnited States · 58 kmHigh 22.2°C · Low 12.7°C · 96 mm rain
- Wilmington (Delaware), United States in MayUnited States · 161 kmHigh 22.0°C · Low 12.4°C · 89 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Germantown) is explained once on the Germantown year overview and on the Sources, method and limits page.