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Saints Constantine and Helena in September sees high daytime temperatures of 23°C (73°F) and nighttime lows of 17°C (63°F). Moderate rainfall is typical, with around 54 mm (2.1 in) for the month.
If your ideal day consists of dry skies and pleasant temperatures, May, June, July, August and September typically offer the best circumstances for Saints Constantine and Helena.
Pick a month to see the average temperature, rainfall and sunshine in Saints Constantine and Helena - and find the best time to visit.
49-year average (1976-2025)
Based on our historical records, temperatures in Saints Constantine and Helena typically drop from around 26°C (79°F) at the start of September to approximately 22°C (72°F) by the end. Nights are cool, with lows typically ranging from 12°C (54°F) to 16°C (61°F).
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Browse day-by-day weather records for Saints Constantine and Helena spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Our historical data for Saints Constantine and Helena spans 1997 to 2025, revealing these weather extremes.
Find out more about the weather in Bulgaria and which places have the best travel conditions in this month. See all of Bulgaria in September →
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days. Expect water temperatures of around 23°C (73°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Saints Constantine and Helena climate overview or explore weather in Bulgaria.
Where to go in September - average daytime high across popular destinations.
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