Gaithersburg, Maryland Weather
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Climate of Gaithersburg: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Gaithersburg, with average daytime highs around 31°C. January is the coolest, when nights typically fall to about -5°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 36°C, so the seasons feel very different from each other.
The area receives about 1120 mm of rain in a typical year. Most of it falls from May to July and September, and May is the wettest month at roughly 120 mm.
For outdoor plans and travel, April, August and October usually offer the most comfortable weather in Gaithersburg, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 4° | -5° | 65 mm | 82% |
| Feb | 6° | -4° | 67 mm | 81% |
| Mar | 11° | 0° | 81 mm | 79% |
| Apr | 18° | 6° | 94 mm | 76% |
| May | 23° | 12° | 120 mm | 78% |
| Jun | 28° | 17° | 116 mm | 74% |
| Jul | 31° | 20° | 109 mm | 68% |
| Aug | 31° | 19° | 95 mm | 68% |
| Sep | 27° | 15° | 108 mm | 70% |
| Oct | 20° | 8° | 99 mm | 76% |
| Nov | 13° | 2° | 77 mm | 79% |
| Dec | 6° | -2° | 87 mm | 84% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Gaithersburg. Values describe typical conditions, not a forecast.
About Gaithersburg weather
Gaithersburg is one of many towns in Maryland's humid subtropical-to-continental climate along the Chesapeake Bay, about 53 km west of Baltimore. Before the rains arrive, there's hot, humid summers (June–August). Cooler months mean cool winters (December–February) with occasional snow. This page shows live, auto-refreshing weather for Gaithersburg: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/New_York.
Frequently asked questions
Gaithersburg is about 53 km west of Baltimore, in Maryland.
Gaithersburg sees cool winters (December–February) with occasional snow.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Gaithersburg's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Gaithersburg, with average daytime highs of about 31°C and nights around 20°C.
The coldest nights come in January, when the average low is about -5°C and daytime highs reach around 4°C. Frost is possible on clear, calm nights.
Gaithersburg receives about 1120 mm of rain in a typical year. May is the wettest month at roughly 120 mm, and the main rainy period is May to July and September.
April, August and October usually offer the most comfortable weather in Gaithersburg, with mild daytime temperatures and little rain.
In November Gaithersburg typically sees daytime highs near 13°C and lows near 2°C, with about 77 mm of rain over the month and average humidity around 79%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
Live temperature for Gaithersburg is shown at the top of this page and refreshes automatically — see the hourly breakdown below for how it changes through the day.
Gaithersburg's day-to-day weather follows the broader pattern of Maryland described above. See the hourly weather forecast or the air quality index for more detail.