Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 0.9 °C | 3.1 °C | 11 days | Unfavourable season |
| February | 1.7 °C | 2.1 °C | 9 days | Unfavourable season |
| March | 4.9 °C | 2.2 °C | 8 days | Unfavourable season |
| April | 9.2 °C | 3.6 °C | 9 days | Unfavourable season |
| May | 15.3 °C | 7 °C | 9 days | Possible, with trade-offs |
| June | 20.4 °C | 12.2 °C | 9 days | Pleasant — a good time to go |
| July | 21.5 °C | 16 °C | 13 days | Pleasant — a good time to go |
| August | 20.8 °C | 16.6 °C | 12 days | Pleasant — a good time to go |
| September | 16.5 °C | 14.2 °C | 10 days | Possible, with trade-offs |
| October | 10.3 °C | 10.2 °C | 10 days | Unfavourable season |
| November | 5.2 °C | 7.3 °C | 11 days | Unfavourable season |
| December | 2.1 °C | 4.7 °C | 12 days | Unfavourable season |
Before you go
Three things to check once you have picked your dates.
Entry
Sweden 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 Norrtälje in October?
The sea averages 10.2°C in October — too cold for most swimmers.
How hot is Norrtälje in October?
Expect 10.3°C in the afternoon and 5.3°C at night, averaged over the last 10 years.
Does it rain a lot in Norrtälje in October?
Around 10 days with rain (≥ 1 mm) in the month — 33% of days.