Click on a day for an hourly weather forecast
The temperatures in Harrisburg in September are comfortable with low of 13°C and and high up to 24°C.
You can expect about 3 to 8 days of rain in Harrisburg 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 Harrisburg in September 2025.
If you’re planning to visit Harrisburg in the near future, we highly recommend that you review the 14 day weather forecast for Harrisburg before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 1° / -6° | 7 | 15 | 10 | 89 mm | Awful | Harrisburg in January |
| February | 4° / -5° | 7 | 13 | 9 | 111 mm | Awful | Harrisburg in February |
| March | 9° / 0° | 7 | 19 | 5 | 111 mm | Awful | Harrisburg in March |
| April | 15° / 5° | 8 | 21 | 1 | 122 mm | Ok | Harrisburg in April |
| May | 21° / 11° | 9 | 22 | 0 | 160 mm | Ok | Harrisburg in May |
| June | 26° / 15° | 9 | 21 | 0 | 155 mm | Good | Harrisburg in June |
| July | 29° / 17° | 9 | 22 | 0 | 180 mm | Ok | Harrisburg in July |
| August | 28° / 16° | 7 | 24 | 0 | 165 mm | Good | Harrisburg in August |
| September | 24° / 13° | 6 | 24 | 0 | 139 mm | Perfect | Harrisburg in September |
| October | 18° / 8° | 6 | 25 | 0 | 129 mm | Good | Harrisburg in October |
| November | 10° / 1° | 5 | 24 | 1 | 93 mm | Ok | Harrisburg in November |
| December | 5° / -2° | 7 | 19 | 6 | 111 mm | Awful | Harrisburg in December |