Where is the sea warmest in the world in September?
In September the warmest sea in the world is at Ar Ruways, United Arab Emirates, at 34.3°C. 1,283 of 1,642 cities measured are comfortable this month.
| # | City | Country | Sea | Swimming |
|---|---|---|---|---|
| 1 | Ar Ruways | United Arab Emirates | 34.3°C | Bath-like |
| 2 | Musay‘īd | Qatar | 34.1°C | Bath-like |
| 3 | Doha | Qatar | 34.0°C | Bath-like |
| 4 | Az̧ Z̧a‘āyin | Qatar | 33.9°C | Bath-like |
| 5 | Bandar-e Sīraf | Iran | 33.9°C | Bath-like |
| 6 | Bandar-e ‘Asalūyah | Iran | 33.8°C | Bath-like |
| 7 | Madīnat ash Shamāl | Qatar | 33.7°C | Bath-like |
| 8 | Abu Dhabi | United Arab Emirates | 33.7°C | Bath-like |
| 9 | Khalifah A City | United Arab Emirates | 33.7°C | Bath-like |
| 10 | Dukhān | Qatar | 33.6°C | Bath-like |
| 11 | Bandar-e Deyr | Iran | 33.6°C | Bath-like |
| 12 | Manama | Bahrain | 33.5°C | Bath-like |
| 13 | Bushehr | Iran | 33.5°C | Bath-like |
| 14 | Khobar | Saudi Arabia | 33.4°C | Bath-like |
| 15 | Az Zallāq | Bahrain | 33.4°C | Bath-like |
| 16 | The Palm Jumeirah | United Arab Emirates | 33.4°C | Bath-like |
| 17 | Dammam | Saudi Arabia | 33.3°C | Bath-like |
| 18 | Ras Tanura | Saudi Arabia | 33.3°C | Bath-like |
| 19 | Al Awjām | Saudi Arabia | 33.3°C | Bath-like |
| 20 | Bandar-e Genāveh | Iran | 33.3°C | Bath-like |
| 21 | Warīsān | United Arab Emirates | 33.1°C | Bath-like |
| 22 | Al Jubayl | Saudi Arabia | 33.1°C | Bath-like |
| 23 | Sharjah | United Arab Emirates | 33.0°C | Bath-like |
| 24 | Jizan | Saudi Arabia | 32.9°C | Bath-like |
| 25 | Massawa | Eritrea | 32.9°C | Bath-like |
Ranked on the NOAA OISST monthly climatology — a long-run average for September, not a forecast. A given September will run warmer or cooler than this, and the sea is warmest late in the afternoon and late in the season.