Weather in Constanta - 14-day forecast

Detailed weather forecast for Constanta, Romania: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.

Forecast for the next days in Constanta

today☀️ 25°💧 1.5 mm

Sun☀️ 26°💧 0.2 mm

Mon☀️ 22°💧 0.4 mm

Tue☀️ 23°💧 14.4 mm

Wed☀️ 23°💧 1.2 mm

Thu☀️ 23°night 21°

Fri☀️ 23°💧 5.8 mm

Sat☀️ 25°💧 0.3 mm

Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Monday 7 Sept in Constanta, the forecast high is 22°C. Typical daytime temperatures at this time of year range from 22°C to 26°C, so it will be cooler than usual. It is cooler than 81% of similar days.

Saturday 5 Sept

25°Cnear normal

usually 22°C–27°C

night: exceptionally warm rain: more rain than usual wind: stronger than usual

Sunday 6 Sept

26°Cwarmer than usual

usually 22°C–26°C

warmer than 74% of similar days

night: exceptionally warm rain: typical rainfall wind: stronger than usual

Monday 7 Sept

22°Ccooler than usual

usually 22°C–26°C

cooler than 81% of similar days

night: near normal rain: more rain than usual wind: typical

Tuesday 8 Sept

23°Cnear normal

usually 22°C–26°C

night: warmer than usual rain: exceptionally wet wind: typical

Wednesday 9 Sept

23°Cnear normal

usually 22°C–26°C

night: warmer than usual rain: more rain than usual wind: lighter than usual

Thursday 10 Sept

23°Cnear normal

usually 21°C–26°C

night: warmer than usual rain: less rain than usual wind: typical

Friday 11 Sept

23°Cnear normal

usually 21°C–26°C

night: warmer than usual rain: exceptionally wet wind: lighter than usual

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →

cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 5-11 Sept period averaged 24°C by day. The coolest year was 1996 (20°C) and the warmest was 2008 (27°C). The current forecast averages 24°C - close to the historical median.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

Weather warnings - Constanta

No active weather warnings for Constanta (region: CONSTANTA). The national weather service is not forecasting dangerous conditions.

14-day forecast - Constanta

Constanta - 14-day weather forecast infographic

Constanta 30 & 45-day weather - long-range outlook

Next 16 days · forecast

23°

around 21° at night · days with rain: 5

Weeks 3-4 · avg for September

24°

around 14° at night · rain chance 10%

Weeks 5-7 · avg for October

17°

around 9° at night · rain chance 29%

The 30 & 45-day outlook for Constanta: the next 16 days are a numerical forecast updated daily - on average 23° by day and 21° at night. Further out we rely on multi-year climate averages: around 24° in September, and about 17° in October. Forecasts beyond two weeks are indicative only.

Day-by-day forecast for Constanta

Saturday5 September 2026

☀️25°clear sky

sunrise 06:32 · sunset 19:35 · night 23° · evening 28° · rain 1.53 mm · humidity 47% · wind 9 m/s · clouds 2%

Sunday6 September 2026

☀️26°clear sky

sunrise 06:34 · sunset 19:34 · night 22° · evening 25° · rain 0.18 mm · humidity 42% · wind 9 m/s · clouds 5%

Monday7 September 2026

☀️22°clear sky

sunrise 06:35 · sunset 19:32 · night 20° · evening 21° · rain 0.39 mm · humidity 44% · wind 7 m/s · clouds 2%

Tuesday8 September 2026

☀️23°clear sky

sunrise 06:36 · sunset 19:30 · night 21° · evening 22° · rain 14.41 mm · humidity 47% · wind 7 m/s · clouds 5%

Wednesday9 September 2026

☀️23°clear sky

sunrise 06:37 · sunset 19:28 · night 21° · evening 23° · rain 1.17 mm · humidity 50% · wind 5 m/s · clouds 93%

Thursday10 September 2026

☀️23°clear sky

sunrise 06:38 · sunset 19:26 · night 21° · evening 22° · humidity 53% · wind 6 m/s · clouds 3%

Friday11 September 2026

☀️23°clear sky

sunrise 06:39 · sunset 19:24 · night 20° · evening 22° · rain 5.82 mm · humidity 56% · wind 5 m/s · clouds 1%

Saturday12 September 2026

☀️25°clear sky

sunrise 06:40 · sunset 19:23 · night 21° · evening 24° · rain 0.3 mm · humidity 48% · wind 9 m/s · clouds 4%

Sunday13 September 2026

☁️26°overcast clouds

sunrise 06:42 · sunset 19:21 · night 23° · evening 25° · rain 3.45 mm · humidity 63% · wind 10 m/s · clouds 86%

Monday14 September 2026

🌧️20°light rain

sunrise 06:43 · sunset 19:19 · night 19° · evening 20° · rain 0.42 mm · humidity 53% · wind 10 m/s · clouds 100%

Tuesday15 September 2026

☁️21°broken clouds

sunrise 06:44 · sunset 19:17 · night 20° · evening 21° · humidity 48% · wind 6 m/s · clouds 55%

Wednesday16 September 2026

☁️22°broken clouds

sunrise 06:45 · sunset 19:15 · night 20° · evening 21° · humidity 53% · wind 6 m/s · clouds 65%

Thursday17 September 2026

🌧️26°light rain

sunrise 06:46 · sunset 19:13 · night 23° · evening 24° · rain 0.51 mm · humidity 57% · wind 8 m/s · clouds 58%

Friday18 September 2026

🌧️23°light rain

sunrise 06:47 · sunset 19:11 · night 21° · evening 22° · rain 0.12 mm · humidity 49% · wind 8 m/s · clouds 100%

Saturday19 September 2026

☁️23°broken clouds

sunrise 06:48 · sunset 19:09 · night 20° · evening 22° · humidity 55% · wind 7 m/s · clouds 69%

Sunday20 September 2026

🌧️21°light rain

sunrise 06:50 · sunset 19:08 · night 20° · evening 20° · rain 0.15 mm · humidity 60% · wind 12 m/s · clouds 100%

UV index in Constanta - is it safe to sunbathe?

Today the UV index in Constanta is 6 (moderate) - unprotected fair skin can burn in about 35 minutes. Seek shade around midday. SPF 30+, sunglasses and a hat for longer stays.

Pollen in Constanta - info for allergy sufferers

Today mugwort pollen is highest in Constanta - about 20 grains/m³, moderate level. Most allergy sufferers should not feel strong symptoms. Pollen levels are a CAMS model forecast and are indicative.

Sea temperature - Constanta

Water today

25°C

Week avg

25°C

Waves today

0.5 m

How's the water?

warm

16-day sea temperature forecast:

5.09 25°C6.09 25°C7.09 25°C8.09 25°C9.09 25°C10.09 24°C11.09 24°C12.09 24°C13.09 24°C

Average sea temperature through the year:

Jan 8°CFeb 6°CMar 8°CApr 11°CMay 16°CJun 22°CJul 25°CAug 25°CSep 24°COct 19°CNov 14°CDec 11°C

Sea-surface temperature from marine models, updated daily. See also: where the sea is warmest right now.

Constanta weather through the year

Warmest, driest months on average: April, May, June, July.

Upcoming public holidays in Romania: St. Andrew's Day — 30 November · National Day/Great Union — 1 December · Christmas Day — 25 December.

Nearby and related places

DobrichVarnaGalatiShumenCahulBucharestClujIasiOradeaBaia Mare

FAQ - Constanta weather

What is the weather like in Constanta today?

Today it is about 25° during the day and 23° at night, clear sky.

How far ahead can I check the forecast for Constanta?

This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.