Click on a day for an hourly weather forecast
The temperatures in Derry in July are usually low and can range between 10°C and 17°C.
You can expect about 3 to 8 days of rain in Derry during the month of July. 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 Derry in July 2025.
If you’re planning to visit Derry in the near future, we highly recommend that you review the 14 day weather forecast for Derry before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 6° / 2° | 8 | 18 | 5 | 59 mm | Awful | Derry in January |
| February | 7° / 2° | 8 | 16 | 5 | 59 mm | Awful | Derry in February |
| March | 9° / 2° | 7 | 21 | 3 | 51 mm | Awful | Derry in March |
| April | 11° / 4° | 4 | 24 | 1 | 41 mm | Ok | Derry in April |
| May | 14° / 6° | 6 | 25 | 0 | 55 mm | Good | Derry in May |
| June | 16° / 8° | 5 | 25 | 0 | 66 mm | Good | Derry in June |
| July | 17° / 10° | 7 | 24 | 0 | 78 mm | Ok | Derry in July |
| August | 17° / 10° | 6 | 25 | 0 | 66 mm | Good | Derry in August |
| September | 15° / 9° | 5 | 25 | 0 | 44 mm | Good | Derry in September |
| October | 12° / 7° | 6 | 25 | 0 | 62 mm | Ok | Derry in October |
| November | 9° / 4° | 7 | 22 | 1 | 63 mm | Bad | Derry in November |
| December | 7° / 3° | 7 | 22 | 2 | 57 mm | Awful | Derry in December |