Click on a day for an hourly weather forecast
The temperatures in Londonderry in September are quite cold with temperatures between 9°C and 17°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Londonderry 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 Londonderry in September 2024.
If you’re planning to visit Londonderry in the near future, we highly recommend that you review the 14 day weather forecast for Londonderry before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 5° / 1° | 5 | 21 | 5 | 37 mm | Awful | Londonderry in January |
| February | 7° / 1° | 6 | 17 | 5 | 42 mm | Bad | Londonderry in February |
| March | 9° / 2° | 5 | 24 | 3 | 31 mm | Bad | Londonderry in March |
| April | 12° / 3° | 3 | 26 | 1 | 26 mm | Ok | Londonderry in April |
| May | 15° / 6° | 5 | 26 | 0 | 45 mm | Good | Londonderry in May |
| June | 18° / 8° | 4 | 26 | 0 | 49 mm | Good | Londonderry in June |
| July | 20° / 11° | 4 | 27 | 0 | 57 mm | Good | Londonderry in July |
| August | 19° / 11° | 4 | 27 | 0 | 55 mm | Good | Londonderry in August |
| September | 17° / 9° | 3 | 27 | 0 | 35 mm | Good | Londonderry in September |
| October | 13° / 7° | 5 | 26 | 0 | 46 mm | Ok | Londonderry in October |
| November | 9° / 4° | 7 | 22 | 1 | 47 mm | Ok | Londonderry in November |
| December | 6° / 2° | 6 | 23 | 2 | 39 mm | Awful | Londonderry in December |