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United States weather

Weather in Frederick County, Maryland for September 2025

Your guide to Frederick County weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Frederick County has been nearly identical to the historical average, with a temperature of 25.5 °F (showing only a slight deviation of -0.2 °F).

  • The forecast for the next days in Frederick County predicts temperatures to be around 25 °F, close to the historical average.

  • In general, the average temperature in Frederick County at the beginning of September is 25.1 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 24.4 °F by the end of September.

    • Rain 🌧️

  • Frederick County experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 188.5 mm.

    • More

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Average dry days
21
Dry days
Average rainy days
9
Rainy days
Average snowy days
0
Snow days
Average temperatures
24°/14°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
76 %
Avg humidity

Frederick County Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Light rain shower
25°
2
Overcast
24°
3
Sunny
23°
4
Overcast
27°
5
Mist
28°
6
Patchy rain possible
27°
7
Patchy light drizzle
22°
8
Sunny
22°
9
Sunny
24°
10
Sunny
26°
11
Sunny
27°
12
Sunny
26°
13
Mist
27°
14
Mist
29°
15
Sunny
28°
16
Overcast
23°
17
Patchy rain possible
19°
18
Cloudy
30°
19
Patchy rain possible
32°
20
Overcast
27°
21
Overcast
22°
22
Mist
27°
23
Partly cloudy
27°
24
Partly cloudy
28°
25
Patchy rain possible
27°
26
Patchy rain possible
27°
27
Patchy rain possible
21°
28
Patchy rain possible
25°
29
Patchy rain possible
21°
30
Moderate rain
22°

Temperatures trend during September in Frederick County

See the weather trend as well as the moving average line

September weather in Frederick County day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Light rain shower
Light rain shower
 25° /15° 1.8 mm 6
Sept. 2 Overcast
Overcast
 24° /13° 0 mm 5
Sept. 3 Sunny
Sunny
 23° /11° 0 mm 6
Sept. 4 Overcast
Overcast
 27° /13° 24.2 mm 6
Sept. 5 Mist
Mist
 28° /14° 4.3 mm 7
Sept. 6 Patchy rain possible
Patchy rain possible
 27° /15° 3.8 mm 6
Sept. 7 Patchy light drizzle
Patchy light drizzle
 22° /12° 0.3 mm 5
Sept. 8 Sunny
Sunny
 22° /7° 0 mm 6
Sept. 9 Sunny
Sunny
 24° /8° 0 mm 7
Sept. 10 Sunny
Sunny
 26° /9° 0 mm 6
Sept. 11 Sunny
Sunny
 27° /12° 0 mm 7
Sept. 12 Sunny
Sunny
 26° /13° 0 mm 7
Sept. 13 Mist
Mist
 27° /14° 0 mm 7
Sept. 14 Mist
Mist
 29° /16° 0 mm 6
Sept. 15 Sunny
Sunny
 28° /13° 2.8 mm 7
Sept. 16 Overcast
Overcast
 23° /13° 2.2 mm 5
Sept. 17 Patchy rain possible
Patchy rain possible
 19° /12° 1.1 mm 0.3
Sept. 18 Cloudy
Cloudy
 30° /18° 0 mm 1.1
Sept. 19 Patchy rain possible
Patchy rain possible
 32° /16° 3.5 mm 1.5
Sept. 20 Overcast
Overcast
 27° /14° 0 mm 1.5
Sept. 21 Overcast
Overcast
 22° /14° 0.1 mm 0
Sept. 22 Mist
Mist
 27° /17° 0.1 mm 4
Sept. 23 Partly cloudy
Partly cloudy
 27° /15° 0 mm 6
Sept. 24 Partly cloudy
Partly cloudy
 28° /17° 0 mm 6
Sept. 25 Patchy rain possible
Patchy rain possible
 27° /18° 0.4 mm 5
Sept. 26 Patchy rain possible
Patchy rain possible
 27° /18° 4.5 mm 5
Sept. 27 Patchy rain possible
Patchy rain possible
 21° /18° 4.7 mm 4
Sept. 28 Patchy rain possible
Patchy rain possible
 25° /19° 2.6 mm 5
Sept. 29 Patchy rain possible
Patchy rain possible
 21° /18° 2.7 mm 4
Sept. 30 Moderate rain
Moderate rain
 22° /17° 7 mm 4
Next
Important Notice
Our weather forecast for Frederick County in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Frederick County forecast closer to your planned date for the most up-to-date weather information.
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Frederick County in September - FAQ

What are the expected maximum and minimum temperatures in Frederick County during September?
Enjoy moderate daytime temperatures of up to 24° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Frederick County during September?
Significant rainfall exceeding 188.5 mm is expected in Frederick County during September, occurring over more than 9 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Frederick County during September?
The average wind speed in Frederick County during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Frederick County

Explore the daily rainfall trends and prepare for Frederick Countys September weather 💧

UV exposure in Frederick County during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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Location coordinates Where is Frederick County?

Get accurate weather forecasts for Frederick County, located at latitude 39.414 and longitude -77.411. Stay updated with localized weather information tailored for Frederick County.

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