Mamaia (Constanța) weather in September
September in Mamaia: warm, a little rain, with clean air — one of the best months to visit.
Updated September 2026 · climate normals from ERA5 reanalysis
#2 of 12 months in Mamaia · #139 of 1413 destinations to visit in September · comfort 92/100 (tier S)
- Days
- 25°C
- Nights
- 17°C
- Wet days
- 3
- Sun
- 10.5 h
- Humidity
- 67%
- Daylight
- 13 h
Traveller notes on Mamaia in September
Other months in Mamaia
Romania's forum describes February as genuinely cold nationwide, typically 0-5C by day with a real chance of snow, and one Bucharest visitor reported nights as low as -14C during a cold snap. Mamaia's coastal position moderates things somewhat compared to inland cities, but posters were clear the Black Sea coast is fundamentally a summer destination - most of what makes Mamaia appealing (the beach, the resort strip) is dormant this time of year, so it's really a stopover rather than a winter destination in its own right.
Forum posters name the July 15 to August 25 window as the best time to visit Mamaia, when the Black Sea stays warm and comparatively shallow near shore. Posters describe typical conditions as very warm, above 30C in Romania's lower-elevation coastal areas, with one visitor even in late September reporting a fabulous 32C with clear skies and a gentle breeze - suggesting August itself should run at least as warm. Posters consistently flag real crowding as the trade-off for that peak-season heat and sunshine, describing Mamaia as one of Romania's more traditional resorts and especially packed during July and August. Posters generally rate August as ideal for a beach vacation here, crowds notwithstanding.
Add your own note from Mamaia's card on the map.
Mamaia climate normals — September
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Mamaia in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusyBeach season opens, school holidays in 3 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Mamaia's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Best weatherMamaia's weather peaks July–September, best around August.
Best weatherFair weatherToughest weather
What's on in Mamaia in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Beach season opens
25 May – 15 Sep · usuallySummer season opensCrowdedBeach clubs, sunbed concessions and the cable car along the strip come back at once around the start of June, and the whole four-kilometre sandbar switches on. The wide, restocked sand at the north end is the newer half.
- Season
Sea warm enough to swim
15 Jun – 15 Sep · usuallyThe Black Sea here is shallow and slow to warm: June still catches people out, and a northerly blowing for a day or two can turn the water over and drop it again in August. September is the reliable stretch.
- Season
Resort shutdown
20 Sep – 20 May · usuallyOff-season shutdownClosuresMamaia is a purpose-built summer strip and it closes almost completely: hotels shuttered, the cable car stopped, the club terraces stacked and wrapped. Constanța next door stays a working city, which is where you go instead.
Nearby, and something's on
Within 300 km of Mamaia — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Mamaia?
Mamaia in September — FAQ
- Is September a good time to visit Mamaia?
- September in Mamaia: warm, a little rain, with clean air — one of the best months to visit. It ranks #2 of 12 months for Mamaia on SeasonMap's comfort score (92/100).
- What is the weather like in Mamaia in September?
- In September, Mamaia averages a daily high of 24.7°C and a low of 16.9°C, with about 32.7 mm of rain over roughly 2.8 rainy days.
- What is the air quality in Mamaia in September?
- Mamaia has a mean US Air Quality Index of about 41 in September.
Within 300 km: Bucharest's George Enescu Festival around 27 Aug – 26 Sep, and Brașov's Bear watching season around 1 May – 30 Sep.