Month-specific sea-surface temperature · Mexico

Puerto Morelos Sea Temperature in September

30.3°C

86.5°F

In September, sea-surface temperature near Puerto Morelos has a historical monthly average of 30.3°C. This is not the reading for any particular holiday date.

Across 2023–2025, the lowest and highest yearly September monthly means were 30.1–30.5°C. These are not daily extremes.

Previous month

August · 30.2°C

Change into September: +0.1°C

Next month

October · 30.0°C

Change into next month: -0.3°C

Can you swim or snorkel in Puerto Morelos in September?

At 30.3°C our temperature-only guide describes the water as very warm water. Comfort depends on your cold tolerance, immersion time and wind. A historical average cannot determine whether conditions are safe on any given day.

Do you need a wetsuit?

Swimwear is usually enough; a rash guard adds sun protection.

Which beach should you choose?

Look for a beach sheltered from the actual forecast waves and wind on your visit. Exposure, currents and entry conditions vary even where water temperatures are similar. Follow local warnings.

Check the current waves, wind and snorkeling forecast →

A live forecast does not predict a future September. Check again close to your trip.

Waves and wind: recorded-model conditions for September

These figures come from a separately modelled, date-specific wind/wave backfill, not the NOAA SST series. A single observed season is not a climatological likelihood or a guarantee of safe conditions.

Compare nearby coasts with their own evidence

Coast	Morning	Afternoon	Period
Cozumel	90%	86%	Sep 2026

A “calm hour” meets fixed modelled wave/wind thresholds; neither visibility nor local currents, entry conditions or actual beach safety is measured here. Periods may differ by coast.

Nearby places in September

Comparable historical averages from independent marine grid cells. Warmer water does not imply safe snorkeling.

Punta Nizuc 29.8°C
Playa del Carmen 30.4°C
Cancun 29.4°C
Chankanaab 30.4°C

Puerto Morelos Sea Temperature: All 12 Months

Choose a month for available historical evidence, month comparisons and swim guidance. Missing history is clearly marked and never presented as a long-term normal.

January 27.4°C February 27.2°C March 27.5°C April 27.9°C May 28.8°C June 29.6°C July 29.7°C August 30.2°C September 30.3°C October 30.0°C November 29.0°C December 28.1°C

Data source and limitations

Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature; 2023–2025. Marine model grid near 20.85, -86.88. Based on 3 yearly monthly means and 2160 recorded samples. Source methodology.

Modelled sea-surface temperatures do not establish underwater visibility, wildlife, calm currents or safe entry.