Constanţa Weather in September

September in Constanţa sees daytime temperatures around 24°C (75°F) and lows of 17°C (63°F) at night. As the wettest month of the year, keep in mind that rainfall is at its highest.

Rainfall in Constanţa in September

It's the month with the heaviest rainfall, so an umbrella is a must to navigate the wet weather. Typically, you can expect about 5 days of rain this month, with 55 mm (2.2 in) on average. Rainfall tends to arrive in short, intense showers this month. Rain days are few, but the showers can be surprisingly heavy.

Temperature in Constanţa in September

September in Constanţa is generally perfect, with days reaching 24°C (75°F) and nights settling around 17°C (63°F). This kind of day-to-night contrast is typical for this time of year. With lows of 17°C (63°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in Constanţa in September

The city usually sees around 228 hours of sunlight, indicating many sunny days — a great month for sightseeing.

Wind Speed in Constanţa in September

In September, average wind speeds reach 4 m/s (8 knots), leading to light to moderate breezes. Conditions vary from day to day, with both calm and windier periods.

Average water temperature in September

The water sits at 21°C (70°F), which is a nice temperature for swimming. Not too cold, not too warm — most visitors are happy to spend time in the water.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, June, July, August and September typically offer the best weather for Constanţa.

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Check the conditions for any month of the year.

• January
• February
• March
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• May
• June
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• August

• September
• October
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• December

For a detailed overview over the year and the best time to visit Romania, check out our Constanţa's climate page.

Constanţa Temperature in September

Min Temperature 17°C (63°F)  

Max Temperature 24°C (75°F)  

Water Temperature 21°C (70°F)  

Chance of Rain 18%  

Precipitation 55 mm (2.2 in)  

Rainy days 5 days  

Humidity 79%  

Windspeed 4 m/s (8 knots)  

Sunshine 228 hours  

Percentage Sunshine  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Constanţa typically drop from around 25°C (77°F) at the start of September to approximately 21°C (70°F) by the end. Nights are pleasant, with lows typically ranging from 12°C (54°F) to 16°C (61°F).

Average temperatures in September

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Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

‹ January February March April May June July August September October November December ›

Historical weather for Constanţa in September

Browse day-by-day weather records for Constanţa spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Constanţa historical weather extremes in September

According to our 49 years of weather records for Constanţa, the following extremes were recorded between 1976 and 2025.

• The hottest September day on record in Constanţa reached 34°C (93°F) (September 15, 1987).
• On September 21, 1996, Constanţa saw its coldest September day with temperatures maxing out at 11°C (52°F).
• Nighttime temperatures dropped to 0°C (32°F) on September 29, 1977, marking the coldest September night on record.

What to Wear in Constanţa in September

Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. Expect water temperatures of around 21°C (70°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Constanţa in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

10/10

Cycling

10/10

Walking

10/10

Barbeque

9/10

Camping

8/10

Outdoor sports

10/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Romania, check out our Constanţa's climate page.

More climate data for Constanţa

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Constanţa climate overview or explore weather in Romania.