Brazil: where to swim in September?
Brazil, in September: the sea is at 24.2 °C on average along the coast, from 17.6 °C to 28.8 °C depending on the spot. Where the water is warmest (28.8 °C), it is very warm. Almost lukewarm: you can get in without any cold shock.
Sea temperature, month by month
| Month | Average temperature | Depending on the spot | Where it is warmest |
|---|---|---|---|
| January | 27.1 °C | 24.8 °C – 28.4 °C | very warm |
| February | 27.2 °C | 24.9 °C – 28.4 °C | very warm |
| March | 27.3 °C | 24.8 °C – 28.6 °C | very warm |
| April | 27.1 °C | 23.3 °C – 28.9 °C | very warm |
| May | 26.0 °C | 21.0 °C – 28.8 °C | very warm |
| June | 25.0 °C | 18.3 °C – 28.9 °C | very warm |
| July | 24.2 °C | 16.7 °C – 28.7 °C | very warm |
| August | 23.9 °C | 16.2 °C – 28.7 °C | very warm |
| September | 24.2 °C | 17.6 °C – 28.8 °C | very warm |
| October | 24.8 °C | 19.6 °C – 28.6 °C | very warm |
| November | 25.7 °C | 21.6 °C – 28.8 °C | very warm |
| December | 26.4 °C | 23.3 °C – 28.6 °C | very warm |
Compared with August, the water warms up by 0.3 °C in September. The warmest month: March (27.3 °C). The coldest: August (23.9 °C).
Nearby, in September
- United States Virgin Islands 29.3 °C · very warm
- Puerto Rico 29.4 °C · very warm
- Mexico 28.3 °C · very warm
- Portugal 20.2 °C · pleasant
- United States 23.0 °C · very warm
- Ireland 15.0 °C · cool
- France 20.1 °C · warm
- United Kingdom 14.3 °C · cool
- Netherlands 17.7 °C · cool
And right now?
For the temperature measured right now, station by station and to the hour: Brazil: water temperature
Frequently asked questions
What is the sea temperature in September?
Brazil, in September: 24.2 °C on average along the coast, from 17.6 °C in the coolest waters to 28.8 °C in the warmest (average of the years 2011 to 2025).
Can you swim in September?
Where the water is warmest (28.8 °C), it is very warm. Almost lukewarm: you can get in without any cold shock.
What is the best month for swimming?
The water is warmest in March (27.3 °C on average) and coldest in August (23.9 °C). Where the water is warmest, it goes above 20 °C in these months: January, February, March, April, May, June, July, August, September, October, November, December.
Where is the water warmest in September?
The warmest in September: United States Virgin Islands (29.3 °C), Puerto Rico (29.4 °C), Mexico (28.3 °C). The coolest: Netherlands (17.7 °C).
Where do these temperatures come from?
These are averages of the sea surface temperature from 2011 to 2025, computed from NOAA satellite images (OISST, one value about every 50 km), in a 100 km strip along the coasts of the main country: distant territories (overseas, remote islands) are not counted. It is an estimate, not a measurement taken at the beach: lakes and rivers are not included.