Click on a day for an hourly weather forecast
The temperatures in Grindavik in August are usually low and can range between 10°C and 12°C.
You can expect about 3 to 8 days of rain in Grindavik during the month of August. 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 Grindavik in August 2025.
If you’re planning to visit Grindavik in the near future, we highly recommend that you review the 14 day weather forecast for Grindavik before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 4° / 1° | 14 | 6 | 11 | 203 mm | Awful | Grindavik in January |
| February | 4° / 1° | 12 | 7 | 9 | 178 mm | Awful | Grindavik in February |
| March | 4° / 2° | 13 | 7 | 11 | 183 mm | Awful | Grindavik in March |
| April | 5° / 3° | 13 | 12 | 6 | 146 mm | Awful | Grindavik in April |
| May | 8° / 5° | 11 | 19 | 1 | 125 mm | Bad | Grindavik in May |
| June | 10° / 8° | 7 | 23 | 0 | 88 mm | Bad | Grindavik in June |
| July | 12° / 10° | 7 | 24 | 0 | 102 mm | Bad | Grindavik in July |
| August | 12° / 10° | 7 | 24 | 0 | 124 mm | Bad | Grindavik in August |
| September | 10° / 8° | 13 | 17 | 0 | 204 mm | Bad | Grindavik in September |
| October | 8° / 5° | 12 | 17 | 1 | 184 mm | Bad | Grindavik in October |
| November | 6° / 3° | 13 | 11 | 6 | 160 mm | Awful | Grindavik in November |
| December | 4° / 2° | 11 | 11 | 9 | 156 mm | Awful | Grindavik in December |