Click on a day for an hourly weather forecast
The temperatures in Northern Ireland in August are usually low and can range between 11°C and 17°C.
You can expect rain for roughly half of the month of August in Northern Ireland. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Northern Ireland in August 2025.
If you’re planning to visit Northern Ireland in the near future, we highly recommend that you review the 14 day weather forecast for Northern Ireland before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 7° / 3° | 11 | 17 | 4 | 105 mm | Awful | Northern Ireland in January |
| February | 7° / 3° | 11 | 13 | 5 | 113 mm | Awful | Northern Ireland in February |
| March | 9° / 3° | 10 | 19 | 2 | 99 mm | Awful | Northern Ireland in March |
| April | 11° / 5° | 7 | 22 | 1 | 82 mm | Bad | Northern Ireland in April |
| May | 14° / 7° | 8 | 23 | 0 | 97 mm | Ok | Northern Ireland in May |
| June | 16° / 10° | 8 | 22 | 0 | 121 mm | Ok | Northern Ireland in June |
| July | 17° / 11° | 9 | 22 | 0 | 130 mm | Ok | Northern Ireland in July |
| August | 17° / 11° | 10 | 21 | 0 | 149 mm | Ok | Northern Ireland in August |
| September | 16° / 10° | 7 | 23 | 0 | 99 mm | Ok | Northern Ireland in September |
| October | 13° / 8° | 10 | 21 | 0 | 132 mm | Bad | Northern Ireland in October |
| November | 9° / 6° | 9 | 20 | 1 | 123 mm | Bad | Northern Ireland in November |
| December | 7° / 4° | 9 | 20 | 2 | 110 mm | Awful | Northern Ireland in December |
For a more accurate weather forecast please select a city