Weather in September 2025

Gaithersburg weather in September 2025

°C °F

The average weather in Gaithersburg in September

The temperatures in Gaithersburg in September are comfortable with low of 17°C and and high up to 26°C.

You can expect about 3 to 8 days of rain in Gaithersburg during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.

Our weather forecast can give you a great sense of what weather to expect in Gaithersburg in September 2025.

If you’re planning to visit Gaithersburg in the near future, we highly recommend that you review the 14 day weather forecast for Gaithersburg before you arrive.

Temperatures
26° / 17°
Rainy Days
6
Snowy Days
0
Dry Days
24
Rainfall
135
mm
Sun Hours
9.9
Hrs

Explore the weather in Gaithersburg in other months

Gaithersburg annual weather

Month Temperatures Rainy Days Dry Days Snowy Days Rainfall Weather More details
January 4° / -2° 6 19 6 97 mm
Awful
February 6° / -1° 7 15 6 115 mm
Awful
March 11° / 3° 8 19 4 115 mm
Awful
April 18° / 8° 7 23 0 121 mm
Ok
May 23° / 14° 8 23 0 146 mm
Good
June 28° / 18° 7 23 0 131 mm
Good
July 31° / 21° 8 23 0 161 mm
Ok
August 30° / 21° 7 24 0 154 mm
Ok
September 26° / 17° 6 24 0 135 mm
Perfect
October 20° / 12° 5 26 0 143 mm
Good
November 12° / 5° 5 25 1 91 mm
Ok
December 7° / 2° 6 21 4 124 mm
Bad

Weather in Gaithersburg in September - FAQ

What is the average temperature in Gaithersburg in September?
The average temperature in Gaithersburg in September is 17/26° C.
What is the chance of rain in Gaithersburg in September?
On average, there are 6 rainy days in Gaithersburg during September.
Weather wise, is September a good time to visit Gaithersburg?
The weather in Gaithersburg in September is perfect.
Can it snow in Gaithersburg in September?
On average, there are 0 snowy days in Gaithersburg in September.
More about the weather in Gaithersburg