Click on a day for an hourly weather forecast
The temperatures in Frederick in September are comfortable with low of 14°C and and high up to 25°C.
You can expect about 3 to 8 days of rain in Frederick 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 Frederick in September 2025.
If you’re planning to visit Frederick in the near future, we highly recommend that you review the 14 day weather forecast for Frederick before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 3° / -4° | 6 | 18 | 7 | 90 mm | Awful | Frederick in January |
| February | 5° / -3° | 7 | 14 | 8 | 105 mm | Awful | Frederick in February |
| March | 11° / 1° | 7 | 19 | 5 | 112 mm | Awful | Frederick in March |
| April | 17° / 6° | 8 | 22 | 0 | 116 mm | Ok | Frederick in April |
| May | 23° / 11° | 10 | 21 | 0 | 179 mm | Good | Frederick in May |
| June | 27° / 15° | 8 | 22 | 0 | 156 mm | Good | Frederick in June |
| July | 30° / 18° | 8 | 23 | 0 | 161 mm | Ok | Frederick in July |
| August | 29° / 18° | 7 | 24 | 0 | 145 mm | Ok | Frederick in August |
| September | 25° / 14° | 5 | 25 | 0 | 122 mm | Perfect | Frederick in September |
| October | 19° / 9° | 5 | 26 | 0 | 130 mm | Good | Frederick in October |
| November | 11° / 2° | 5 | 24 | 1 | 95 mm | Ok | Frederick in November |
| December | 6° / -1° | 7 | 20 | 4 | 110 mm | Awful | Frederick in December |