Iceland
Reykjavík in August: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Reykjavík in August is climatically mixed. The average daily high is around 13 °C, and the sea is about 11 °C. With about 18 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
26/100 · #3
Warmth
#2
Dryness
#5
Sun
#5
Sea warmth
#1
Published best categories: none
Reykjavík · AugustPhoto: rheins · CC BY 3.0Climate facts
- Average high
- 13 °C
- Average low
- 8 °C
- Sea
- 11 °C
- Rainy days (est.)
- 18 rainy days (est.)
- Sun (est.)
- 4 h/day
- Humidity
- 86 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| July | 13 | 9 | 16 | 98 | 5.6 | 84 | 1.9 | 11 | 31 |
| August (selected) | 13 | 8 | 18 | 126 | 4.4 | 86 | 2.2 | 11 | 26 |
| September | 10 | 6 | 20 | 164 | 2.6 | 87 | 2.7 | 10 | 17 |
How do the previous and next months compare?
Baseline: August (26/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| July | +5 | +0.6 °C | +0.3 °C | -1.7 | -28.3 mm | +1.2 h | -1.8 % | -0.3 m/s | -0.3 °C |
| September | -9 | -2.9 °C | -2.4 °C | +2.4 | +37.5 mm | -1.8 h | +1.9 % | +0.5 m/s | -1.3 °C |
All twelve months in context
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Where to stay in Reykjavík
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Useful next decisions
Frequently asked questions
How warm is Reykjavík in August?
The average daily high is around 13 °C, with an average daily low of about 8 °C.
Can you swim in Reykjavík in August?
The sea is about 11 °C (cold).
Does it rain a lot in Reykjavík in August?
The curated estimate is about 18 rainy days per month, not a directly measured long-term average. Total precipitation averages around 126 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Reykjavík?
No month in Reykjavík reaches the threshold for a clear recommendation in the climate score; the month comparison above shows the differences.