Mexico: where to swim in September?
Mexico, in September: the sea is at 28.3 °C on average along the coast, from 22.1 °C to 30.3 °C depending on the spot. Where the water is warmest (30.3 °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 | 22.6 °C | 17.1 °C – 28.0 °C | very warm |
| February | 22.3 °C | 16.8 °C – 27.7 °C | very warm |
| March | 22.5 °C | 16.8 °C – 27.6 °C | very warm |
| April | 23.1 °C | 16.8 °C – 28.1 °C | very warm |
| May | 24.5 °C | 17.3 °C – 29.3 °C | very warm |
| June | 25.8 °C | 17.9 °C – 29.9 °C | very warm |
| July | 27.4 °C | 19.7 °C – 30.1 °C | very warm |
| August | 28.3 °C | 21.2 °C – 30.5 °C | very warm |
| September | 28.3 °C | 22.1 °C – 30.3 °C | very warm |
| October | 27.8 °C | 21.6 °C – 30.0 °C | very warm |
| November | 26.0 °C | 20.3 °C – 29.3 °C | very warm |
| December | 24.2 °C | 18.7 °C – 28.8 °C | very warm |
Compared with August, the water hardly changes in September. The warmest month: August (28.3 °C). The coldest: February (22.3 °C).
Nearby, in September
- United States 23.0 °C · very warm
- Puerto Rico 29.4 °C · very warm
- United States Virgin Islands 29.3 °C · very warm
- Canada 4.0 °C · cold
- Brazil 24.2 °C · very warm
- Ireland 15.0 °C · cool
- United Kingdom 14.3 °C · cool
- American Samoa 28.0 °C · very warm
- Portugal 20.2 °C · pleasant
- Sweden 14.7 °C · cool
And right now?
For the temperature measured right now, station by station and to the hour: Mexico: water temperature
Frequently asked questions
What is the sea temperature in September?
Mexico, in September: 28.3 °C on average along the coast, from 22.1 °C in the coolest waters to 30.3 °C in the warmest (average of the years 2011 to 2025).
Can you swim in September?
Where the water is warmest (30.3 °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 August (28.3 °C on average) and coldest in February (22.3 °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 (23.0 °C), Puerto Rico (29.4 °C), United States Virgin Islands (29.3 °C). The coolest: Sweden (14.7 °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.