Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | -3 °C | 0.6 °C | 12 days | Unfavourable season |
| February | -2 °C | 0.1 °C | 9 days | Unfavourable season |
| March | 1.2 °C | 0.1 °C | 9 days | Unfavourable season |
| April | 6.2 °C | 0.4 °C | 10 days | Unfavourable season |
| May | 13 °C | 3.2 °C | 10 days | Possible, with trade-offs |
| June | 18.5 °C | 10.4 °C | 11 days | Possible, with trade-offs |
| July | 20.2 °C | 15.7 °C | 14 days | Possible, with trade-offs |
| August | 19.2 °C | 16 °C | 15 days | Possible, with trade-offs |
| September | 14.2 °C | 13 °C | 13 days | Possible, with trade-offs |
| October | 7.1 °C | 8.7 °C | 13 days | Unfavourable season |
| November | 2.2 °C | 5.6 °C | 12 days | Unfavourable season |
| December | -0.7 °C | 2.8 °C | 14 days | Unfavourable season |
Before you go
Three things to check once you have picked your dates.
Entry
Finland is in the European Union. Entry rules depend on your nationality — check before booking.
Safety
No specific restrictions
Usual precautions apply.
Official advice updated 11 August 2026
Health
Recommended vaccinations, water quality, mosquitoes: advice depends on the country and the season. Some vaccines need time before departure.
Beau Fixe is not a safety or health authority. These notes summarise public advisories and link to their source; only the competent authorities are authoritative. Alert levels: Foreign, Commonwealth & Development Office (gov.uk), Open Government Licence v3.0.
FAQ
Can you swim in Kokkola in September?
The sea averages 13°C in September — too cold for most swimmers.
How hot is Kokkola in September?
Expect 14.2°C in the afternoon and 8.5°C at night, averaged over the last 10 years.
Does it rain a lot in Kokkola in September?
Around 13 days with rain (≥ 1 mm) in the month — 44% of days.