Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 4.6 °C | — | 9 days | Unfavourable season |
| February | 8.8 °C | — | 8 days | Unfavourable season |
| March | 11.4 °C | — | 12 days | Unfavourable season |
| April | 16.6 °C | — | 10 days | Possible, with trade-offs |
| May | 20.5 °C | — | 14 days | Pleasant — a good time to go |
| June | 24.8 °C | — | 12 days | Pleasant — a good time to go |
| July | 28 °C | — | 6 days | Ideal — one of the best times of year |
| August | 28.3 °C | — | 6 days | Ideal — one of the best times of year |
| September | 23.9 °C | — | 5 days | Pleasant — a good time to go |
| October | 18.2 °C | — | 7 days | Possible, with trade-offs |
| November | 11.5 °C | — | 9 days | Unfavourable season |
| December | 6.5 °C | — | 10 days | Unfavourable season |
Before you go
Three things to check once you have picked your dates.
Entry
Bulgaria 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 Sofia in September?
Sofia is not a seaside destination (no sea data).
How hot is Sofia in September?
Expect 23.9°C in the afternoon and 12.9°C at night, averaged over the last 10 years.
Does it rain a lot in Sofia in September?
Around 5 days with rain (≥ 1 mm) in the month — 18% of days.