Gaithersburg Climate: Weather by Month and Best Time to Visit
Best months for Gaithersburg: September, October, June, August.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 5°C | -2°C | 79 mm | 9 | – | – | 4.9 |
| February | 7°C | -1°C | 71 mm | 9 | – | – | 5.3 |
| March | 12°C | 2°C | 97 mm | 10 | – | – | 6.0 |
| April | 19°C | 8°C | 87 mm | 11 | – | – | 7.1 |
| May | 24°C | 13°C | 97 mm | 12 | – | – | 7.4 |
| June | 28°C | 18°C | 91 mm | 11 | – | – | 7.5 |
| July | 31°C | 21°C | 102 mm | 12 | – | – | 7.0 |
| August | 30°C | 20°C | 85 mm | 11 | – | – | 7.5 |
| September | 26°C | 16°C | 113 mm | 10 | – | – | 7.7 |
| October | 19°C | 10°C | 87 mm | 8 | – | – | 7.6 |
| November | 13°C | 4°C | 77 mm | 8 | – | – | 6.6 |
| December | 7°C | 0°C | 89 mm | 9 | – | – | 5.3 |