Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | -5 °C | -0.1 °C | 10 days | Unfavourable season |
| February | -3.9 °C | -0.1 °C | 10 days | Unfavourable season |
| March | -0.7 °C | -0.1 °C | 9 days | Unfavourable season |
| April | 4.5 °C | 0.1 °C | 9 days | Unfavourable season |
| May | 11.9 °C | 3.1 °C | 10 days | Unfavourable season |
| June | 17.7 °C | 13.3 °C | 11 days | Possible, with trade-offs |
| July | 20.2 °C | 17.3 °C | 14 days | Possible, with trade-offs |
| August | 18.6 °C | 16.5 °C | 15 days | Possible, with trade-offs |
| September | 13.4 °C | 13.3 °C | 13 days | Possible, with trade-offs |
| October | 5.9 °C | 8 °C | 13 days | Unfavourable season |
| November | 0.9 °C | 2.9 °C | 12 days | Unfavourable season |
| December | -2 °C | 0.5 °C | 12 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 Oulu in August?
The sea averages 16.5°C in August — too cold for most swimmers.
How hot is Oulu in August?
Expect 18.6°C in the afternoon and 12°C at night, averaged over the last 10 years.
Does it rain a lot in Oulu in August?
Around 15 days with rain (≥ 1 mm) in the month — 48% of days.