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The temperatures in Reykjavik in September are quite cold with temperatures between 7°C and 10°C, warm clothes are a must.
You can expect rain for roughly half of the month of September in Reykjavik. 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.
Please note that Reykjavik can expect a few days of snow in September.
Our weather forecast can give you a great sense of what weather to expect in Reykjavik in September 2025.
If you’re planning to visit Reykjavik in the near future, we highly recommend that you review the 14 day weather forecast for Reykjavik before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 2° / -1° | 10 | 8 | 13 | 138 mm | Awful | Reykjavik in January |
| February | 2° / -1° | 10 | 7 | 12 | 119 mm | Awful | Reykjavik in February |
| March | 3° / -1° | 10 | 7 | 14 | 118 mm | Awful | Reykjavik in March |
| April | 5° / 1° | 11 | 11 | 8 | 101 mm | Awful | Reykjavik in April |
| May | 9° / 4° | 9 | 20 | 3 | 88 mm | Awful | Reykjavik in May |
| June | 12° / 8° | 7 | 23 | 0 | 74 mm | Bad | Reykjavik in June |
| July | 14° / 9° | 7 | 24 | 0 | 82 mm | Ok | Reykjavik in July |
| August | 13° / 9° | 8 | 23 | 0 | 97 mm | Bad | Reykjavik in August |
| September | 10° / 7° | 11 | 18 | 1 | 135 mm | Bad | Reykjavik in September |
| October | 6° / 4° | 11 | 18 | 2 | 111 mm | Awful | Reykjavik in October |
| November | 3° / 1° | 10 | 11 | 9 | 96 mm | Awful | Reykjavik in November |
| December | 1° / -2° | 8 | 11 | 11 | 103 mm | Awful | Reykjavik in December |