Gaithersburg, MD Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Gaithersburg, a city in Montgomery County, Maryland.
Tonight
52°F
Mostly Clear
Mostly clear, with a low around 52. South wind around 3 mph.
7-day forecast for Gaithersburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Mostly Clear | 3 mph S | 2% |
| Wednesday | 73°F | Mostly Sunny | 3 to 10 mph S | 2% |
| Wednesday Night | 61°F | Mostly Cloudy then Chance Light Rain | 8 mph S | 49% |
| Thursday | 74°F | Chance Light Rain | 9 mph S | 54% |
| Thursday Night | 61°F | Chance Light Rain | 2 to 6 mph SW | 50% |
| Friday | 69°F | Rain Likely | 5 mph NW | 61% |
| Friday Night | 49°F | Light Rain Likely | 1 to 6 mph NW | 59% |
| Saturday | 64°F | Mostly Sunny | 7 to 12 mph NW | 12% |
| Saturday Night | 41°F | Partly Cloudy | 5 to 8 mph NW | 12% |
| Sunday | 60°F | Mostly Sunny | 5 to 8 mph W | 7% |
| Sunday Night | 40°F | Partly Cloudy then Slight Chance Light Rain | 5 to 8 mph NW | 20% |
| Monday | 61°F | Slight Chance Light Rain | 8 to 14 mph NW | 20% |
| Monday Night | 39°F | Slight Chance Light Rain | 3 to 8 mph W | 20% |
| Tuesday | 63°F | Sunny | 5 to 12 mph W | 11% |
Forecast source: National Weather Service (api.weather.gov) for Gaithersburg (39.149, -77.195). Updated through the day.
Growing snapshot for Gaithersburg
Last spring frost
Apr 1
First fall frost
Nov 6
Growing season
219 days
Hardiness zone
7b
More local growing data for Gaithersburg: nearby ZIP 20877 weather · frost dates · planting calendar · Maryland frost dates
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Climate data from the nearest NOAA station, Rockville 1 Ne, Md (3.6 mi from Gaithersburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.