Monthly climate averages for Sofia, Bulgaria. Based on 10-year ERA5 reanalysis data.
Cfa Humid Subtropical
Climate OverviewSofia, Bulgaria in September has warm conditions, with highs averaging 22.9°C (73°F).
This month falls at the beginning of Autumn.
Daily highs in September gradually drop from around 25°C (77°F) at the start to 20°C (67°F) by month's end.
Rainfall is heaviest during the last third of the month, while the middle tends to be drier.
Expect around 10.8h of sunshine at the start of September, decreasing to 8.6h by the end.
The warmest days tend to fall around the 1th, averaging 26°C (79°F).
Compared to August, this month is about 4°C cooler with 3 fewer rainy days. Temperatures begin dropping heading into October.
Daily averages based on historical data (2016–2025)
Daytime temperatures around 23°C (73°F) are ideal for full-day outdoor exploration.
Rain is uncommon in this month, so most days stay dry from morning through evening.
2 of the last 5 yearly records were warmer than this month's long-run average.
| Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 4°C / -4°C | 1°C / -7°C | 10days (57 mm) Wet | 6.2h Fair | 79% Humid | 2.3 Moderate | Poor | View Details |
| February | 8°C / -1°C | 5°C / -5°C | 8days (37 mm) Wet | 7.6h Good | 75% Muggy | 3.2 Moderate | Poor | View Details |
| March | 11°C / 2°C | 8°C / -1°C | 11days (60 mm) Wet | 8.4h Good | 71% Muggy | 4.2 Moderate | Poor | View Details |
| April | 16°C / 6°C | 14°C / 3°C | 11days (55 mm) Wet | 10.2h Excellent | 67% Muggy | 5.6 High | Fair | View Details |
| May | 20°C / 10°C | 19°C / 9°C | 14days (72 mm) Wet | 10.9h Excellent | 71% Muggy | 6.3 High | Good | View Details |
| June best | 25°C / 15°C | 26°C / 16°C | 12days (74 mm) Wet | 12.2h Excellent | 71% Muggy | 7.3 Very High | Excellent | View Details |
| July best | 27°C / 17°C | 29°C / 18°C | 8days (44 mm) Wet | 12.8h Excellent | 64% Muggy | 7.5 Very High | Excellent | View Details |
| August best | 27°C / 17°C | 28°C / 18°C | 7days (32 mm) Good | 12.2h Excellent | 61% Muggy | 6.8 High | Excellent | View Details |
| September best | 23°C / 13°C | 22°C / 12°C | 4days (27 mm) Good | 10.1h Excellent | 64% Muggy | 5.2 High | Excellent | View Details |
| October best | 17°C / 8°C | 15°C / 6°C | 6days (47 mm) Good | 8.1h Good | 72% Muggy | 3.7 Moderate | Excellent | View Details |
| November | 11°C / 3°C | 9°C / 0°C | 9days (53 mm) Wet | 6.2h Fair | 81% Humid | 2.3 Moderate | Poor | View Details |
| December | 6°C / -1°C | 3°C / -4°C | 9days (52 mm) Wet | 5.6h Fair | 82% Humid | 1.7 Low | Poor | View Details |
Dress in layers — a mix of long sleeves, light sweaters, and a versatile jacket works best for changeable conditions.
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