Finland
Helsinki in April: weather, sea & travel advice
This month's data profile
Clear transition month
Helsinki in April is climatically mixed. The average daily high is around 5 °C, and the sea is about 2 °C. With about 9 rainy days it is moderate.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
33/100 · #6
Warmth
#7
Dryness
#2
Sun
#5
Sea warmth
#9
Published best categories: none
Helsinki · AprilPhoto: Matti Mattila · CC BY 2.0Climate facts
- Average high
- 5 °C
- Average low
- 1 °C
- Sea
- 2 °C
- Rainy days (est.)
- 9 rainy days (est.)
- Sun (est.)
- 5 h/day
- Humidity
- 85 %
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 |
|---|---|---|---|---|---|---|---|---|---|
| March | 0 | -3 | 10 | 45 | 2.7 | 90 | 3.5 | 1 | 27 |
| April (selected) | 5 | 1 | 9 | 46 | 4.7 | 85 | 2.9 | 2 | 33 |
| May | 11 | 6 | 8 | 47 | 6.5 | 81 | 2.4 | 6 | 42 |
How do the previous and next months compare?
Baseline: April (33/100)
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 | |
|---|---|---|---|---|---|---|---|---|---|
| March | -6 | -4.7 °C | -4 °C | +1.1 | -0.4 mm | -2 h | +5.1 % | +0.6 m/s | -1.5 °C |
| May | +9 | +5.5 °C | +5 °C | -1.1 | +1.3 mm | +1.8 h | -4.2 % | -0.4 m/s | +4 °C |
All twelve months in context
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Frequently asked questions
How warm is Helsinki in April?
The average daily high is around 5 °C, with an average daily low of about 1 °C.
Can you swim in Helsinki in April?
The sea is about 2 °C (cold).
Does it rain a lot in Helsinki in April?
The curated estimate is about 9 rainy days per month, not a directly measured long-term average. Total precipitation averages around 46 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. April is not among them.