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Great Falls, VA Weather
Current conditions
Observed at Gaithersburg - Montgomery County Airport · 39 min ago
Forecast
10-day-
Saturday
Sunny, with a high near 60.
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Saturday Night
Clear, with a low around 39.
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Sunday
Sunny, with a high near 65.
National Weather Service forecast updated 4 days ago.
Hourly
Hourly forecast- Now43°
- 10 AM47°
- 11 AM51°
- 12 PM54°
- 1 PM56°
- 2 PM57°
- 3 PM58°
- 4 PM59°
- 5 PM58°
- 6 PM56°
- 7 PM54°
- 8 PM51°
- 9 PM49°
- 10 PM47°
- 11 PM46°
- Sun12 AM45°
- 1 AM44°
- 2 AM43°
- 3 AM42°
- 4 AM41°
- 5 AM40°
- 6 AM39°
- 7 AM39°
- 8 AM40°
10-day forecast
Details- TueOct 20Sunny45°69°
- WedOct 21Sunny42°65°
- ThuOct 22Sunny45°66°
- FriOct 23Sunny39°60°
- TodayOct 24Sunny39°60°
- SunOct 25Sunny42°65°
- MonOct 26Mostly Sunny50°69°
- TueOct 27Partly cloudy46°68°
- WedOct 28Cloudy45°61°
- ThuOct 29Partly cloudy52°68°
Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.
Radar
Full mapWeather news near Great Falls
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Air quality
Acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.
Forecast
- SatGood (44)
- SunModerate (53)
- MonGood (50)
Northern Virginia, VA reporting area · 1 hr ago. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.
Sun & moon
Almanac
MonthlySterling-Dulles Airport Area, records since 1960. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- Washington 25 km
- Arlington 21 km
- Alexandria 30 km
- Columbia 47 km
- Germantown 20 km
- Silver Spring 23 km
- Centreville 21 km
- Frederick 47 km
- Waldorf 51 km
- Gaithersburg 18 km
- Rockville 15 km
- Dale City 40 km
Forecasters' discussion
From the National Weather Service office in LWX, issued 7 hrs ago
What Has Changed
A Coastal Flood Advisory has been issued for Annapolis. Otherwise, there have been no significant changes to the forecast thinking for the next seven days.
Key Messages
- 1) Frost or freezing temperatures are possible in many areas tonight and Sunday night.
- 2) Dry weather continues through next week along with generally seasonable temperatures.
Discussion
KEY MESSAGE 1...Frost or freezing temperatures are possible in many areas tonight and Sunday night.
With a large area of Canadian high pressure building overhead through the weekend, conditions will likely become favorable for radiational cooling (light to calm winds, mainly clear skies and a cool background airmass). At the moment, it is unclear which night will be the coldest, although tonight (Saturday night) will have a slight advantage given the position of the high overhead.
The growing season for 2026 has ended along and west of the Blue Ridge and Catoctin Mountains, but continues east of there. Any headlines for frost/freeze conditions will only be issued where the growing season remains active.
For tonight, more widespread cold (possible frost/freeze) conditions are possible as high pressure settles more directly overhead. This would bring the frost/freeze threat for most areas outside the major urban centers (downtown DC/Baltimore) and immediate shore of the Chesapeake Bay. If the colder guidance verifies, then the growing season may end for more areas west of I-95 come early Sunday morning. The high will remain overhead through Monday morning, and the low-level airmass doesn't change appreciably, so frost/freeze conditions will be possible again Sunday night.
Did not make appreciable changes to the previous min temperature forecasts, which are near or below the coldest guidance which performs best in radiational cooling (MOS, NBM 10 percentile and Canadian Regional).
KEY MESSAGE 2...Dry weather continues through next week along with generally seasonable temperatures.
Aviation
VFR conditions are expected to prevail through early next week. There are some hints that a slight uptick in low-level moisture could lead to some patchy fog during the early morning hours through the weekend, though confidence in timing and extent of sub-VFR is low at this time. The NAM and related guidance is by far the most aggressive with this outcome, but is an outlier.
E to SE flow is expected today, with light to calm winds again tonight. Wind direction may be a bit variable, ranging from SE to NE as high pressure passes directly overhead Sunday.
P6SM SKC as high pressure dominates early next week. A dry cold front will cross the area late Monday night with winds shifting to N/NW Tuesday.
Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Search index and reflects what the press published. Terms of use.