Finland
Helsinki in August: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Helsinki in August is climatically well suited to city breaks and active holidays and hiking. The average daily high is around 19 °C, and the sea is about 17 °C. With about 13 rainy days it is wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
55/100 · #2
Warmth
#2
Dryness
#8
Sun
#4
Sea warmth
#1
Published best categories: City break, Active
Helsinki · AugustPhoto: Matti Mattila · CC BY 2.0Climate facts
- Average high
- 19 °C
- Average low
- 15 °C
- Sea
- 17 °C
- Rainy days (est.)
- 13 rainy days (est.)
- Sun (est.)
- 5 h/day
- Humidity
- 81 %
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 | 19 | 15 | 10 | 55 | 6.5 | 81 | 2.7 | 16 | 61 |
| August (selected) | 19 | 15 | 13 | 73 | 5.1 | 81 | 3.1 | 17 | 55 |
| September | 15 | 11 | 12 | 63 | 3.1 | 83 | 3.8 | 15 | 40 |
How do the previous and next months compare?
Baseline: August (55/100)
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 | +6 | +0.3 °C | +0.1 °C | -2.7 | -17.7 mm | +1.4 h | +0.3 % | -0.5 m/s | -1 °C |
| September | -15 | -4.2 °C | -3.7 °C | -1.3 | -10 mm | -2 h | +2 % | +0.6 m/s | -2.6 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Helsinki in August?
The average daily high is around 19 °C, with an average daily low of about 15 °C.
Can you swim in Helsinki in August?
The sea is about 17 °C (cold).
Does it rain a lot in Helsinki in August?
The curated estimate is about 13 rainy days per month, not a directly measured long-term average. Total precipitation averages around 73 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Helsinki?
By the climate score, July are the strongest months for Helsinki. August is not among them.