| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 3.2° | -1.7° | 99.9mm | 20.9 | 11 |
| February | 3.3° | -2° | 107.5mm | 20.3 | 11 |
| March | 4.3° | -1.2° | 98.9mm | 21 | 15 |
| April | 7.2° | 1.3° | 70.6mm | 17 | 28 |
| May | 10.2° | 4° | 68mm | 17.6 | 39 |
| June | 13.1° | 7.3° | 54.1mm | 15.4 | 48 |
| July | 14.9° | 9.1° | 58.8mm | 15.3 | 54 |
| August | 14.3° | 8.7° | 81.4mm | 18.1 | 52 |
| September | 11.6° | 6.3° | 100.6mm | 20.2 | 43 |
| October | 7.7° | 2.7° | 97mm | 20.1 | 31 |
| November | 4.9° | 0.1° | 92.2mm | 19 | 19 |
| December | 3.2° | -1.7° | 103.5mm | 20.7 | 11 |
January in Reykjavík averages a daily high of 3.2°C with nights around -1.7°C. Expect roughly 20.9 wet days totalling 99.9mm. A hard month to visit for comfort alone.
February in Reykjavík averages a daily high of 3.3°C with nights around -2°C. Expect roughly 20.3 wet days totalling 107.5mm. A hard month to visit for comfort alone.
March in Reykjavík averages a daily high of 4.3°C with nights around -1.2°C. Expect roughly 21 wet days totalling 98.9mm. A hard month to visit for comfort alone.
April in Reykjavík averages a daily high of 7.2°C with nights around 1.3°C. Expect roughly 17 wet days totalling 70.6mm. A hard month to visit for comfort alone.
May in Reykjavík averages a daily high of 10.2°C with nights around 4°C. Expect roughly 17.6 wet days totalling 68mm. Demanding conditions — pack for it and plan indoor options.
June in Reykjavík averages a daily high of 13.1°C with nights around 7.3°C. Expect roughly 15.4 wet days totalling 54.1mm. Demanding conditions — pack for it and plan indoor options.
July in Reykjavík averages a daily high of 14.9°C with nights around 9.1°C. Expect roughly 15.3 wet days totalling 58.8mm. Demanding conditions — pack for it and plan indoor options.
August in Reykjavík averages a daily high of 14.3°C with nights around 8.7°C. Expect roughly 18.1 wet days totalling 81.4mm. Demanding conditions — pack for it and plan indoor options.
September in Reykjavík averages a daily high of 11.6°C with nights around 6.3°C. Expect roughly 20.2 wet days totalling 100.6mm. Demanding conditions — pack for it and plan indoor options.
October in Reykjavík averages a daily high of 7.7°C with nights around 2.7°C. Expect roughly 20.1 wet days totalling 97mm. A hard month to visit for comfort alone.
November in Reykjavík averages a daily high of 4.9°C with nights around 0.1°C. Expect roughly 19 wet days totalling 92.2mm. A hard month to visit for comfort alone.
December in Reykjavík averages a daily high of 3.2°C with nights around -1.7°C. Expect roughly 20.7 wet days totalling 103.5mm. A hard month to visit for comfort alone.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Reykjavík peaks at 54.
Based on 30 years of records, June–August scores highest for comfort in Reykjavík, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 14.9°C.
February is the wettest, averaging 107.5mm of rain across roughly 20.3 wet days.
January is the coolest month, with average daily highs around 3.2°C.