Finland
Helsinki in May: weather, sea & travel advice
This month's data profile
Clear transition month
Helsinki in May is climatically mixed. The average daily high is around 11 °C, and the sea is about 6 °C. With about 8 rainy days it is moderate.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
42/100 · #4
Warmth
#5
Dryness
#1
Sun
#2
Sea warmth
#7
Published best categories: none
Helsinki · MayPhoto: Matti Mattila · CC BY 2.0Climate facts
- Average high
- 11 °C
- Average low
- 6 °C
- Sea
- 6 °C
- Rainy days (est.)
- 8 rainy days (est.)
- Sun (est.)
- 7 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 |
|---|---|---|---|---|---|---|---|---|---|
| April | 5 | 1 | 9 | 46 | 4.7 | 85 | 2.9 | 2 | 33 |
| May (selected) | 11 | 6 | 8 | 47 | 6.5 | 81 | 2.4 | 6 | 42 |
| June | 16 | 11 | 10 | 61 | 6.9 | 81 | 2.5 | 12 | 49 |
How do the previous and next months compare?
Baseline: May (42/100)
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 | |
|---|---|---|---|---|---|---|---|---|---|
| April | -9 | -5.5 °C | -5 °C | +1.1 | -1.3 mm | -1.8 h | +4.2 % | +0.4 m/s | -4 °C |
| June | +7 | +5 °C | +5.6 °C | +2 | +14.1 mm | +0.4 h | ±0 % | +0.1 m/s | +5.4 °C |
All twelve months in context
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Frequently asked questions
How warm is Helsinki in May?
The average daily high is around 11 °C, with an average daily low of about 6 °C.
Can you swim in Helsinki in May?
The sea is about 6 °C (cold).
Does it rain a lot in Helsinki in May?
The curated estimate is about 8 rainy days per month, not a directly measured long-term average. Total precipitation averages around 47 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. May is not among them.