INSTRUMENT / SEA TEMPERATURE
Updated Sun 12:19 (America/Cancun)
Mexico · Forecast updated Nov 1, 2026, 12:19 UTC
Current Sea Temperature
29.0°C
84.2°F
Very warm water
Valid Nov 1, 2026, 12:19 (America/Cancun). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
0.4°C above
The typical November average is 28.6°C (83.5°F) from the historical baseline.
Recent trend
Cooling by 0.5°C
Seven-day average: 29.0°C, versus 29.5°C in the prior seven days.
What to wear
Very warm water
Swimwear is usually enough; a rash guard adds sun protection.
Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not describe sea conditions or replace the snorkel forecast.
Cancun's hotel zone sits on the same warm Caribbean as Isla Mujeres and Puerto Morelos, but lagoon and beach water can run murkier. Use this page for temperature, then open the reef forecasts for wind, waves and a snorkel score. Temperature is not a safety rating.
In the historical baseline for Cancun, typical monthly averages range from about 26.7°C (80.1°F) in February to 29.4°C (84.9°F) in September.
Over the past 30 days, the average sea temperature in Cancun has been 29.2°C.
Northern Hemisphere. Summer is generally June–August; winter is December–February.
Typical monthly sea-surface temperature near Cancun, calculated from hourly observations for 2022–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 26.5–27.2°C | 26.8°C / 80.2°F |
| February | 26.5–26.9°C | 26.7°C / 80.1°F |
| March | 26.5–27.1°C | 26.9°C / 80.4°F |
| April | 27.0–27.2°C | 27.1°C / 80.8°F |
| May | 27.0–27.9°C | 27.4°C / 81.3°F |
| June | 28.2–28.6°C | 28.4°C / 83.1°F |
| July | 28.6–29.2°C | 28.9°C / 84.0°F |
| August | 28.4–29.3°C | 28.9°C / 84.0°F |
| September | 29.2–29.6°C | 29.4°C / 84.9°F |
| October | 29.2–29.6°C | 29.4°C / 84.9°F |
| November | 28.6–28.7°C | 28.6°C / 83.5°F |
| December | 27.3–28.0°C | 27.6°C / 81.7°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (21.13, -86.71). Each month is the mean of yearly monthly means; the range is the lowest and highest of those yearly monthly means. Open-Meteo methodology.
Each month uses the 2022–2025 baseline. The range is the lowest and highest yearly monthly mean, not an hourly extreme.
Typical January water temperature near Cancun is 26.8°C (80.2°F), with yearly monthly means from 26.5–27.2°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: December 27.6°C · February 26.7°C.
Explore Cancun sea temperature in January, including swim comfort and month comparisons →
Typical February water temperature near Cancun is 26.7°C (80.1°F), with yearly monthly means from 26.5–26.9°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: January 26.8°C · March 26.9°C.
Explore Cancun sea temperature in February, including swim comfort and month comparisons →
Typical March water temperature near Cancun is 26.9°C (80.4°F), with yearly monthly means from 26.5–27.1°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: February 26.7°C · April 27.1°C.
Explore Cancun sea temperature in March, including swim comfort and month comparisons →
Typical April water temperature near Cancun is 27.1°C (80.8°F), with yearly monthly means from 27.0–27.2°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: March 26.9°C · May 27.4°C.
Explore Cancun sea temperature in April, including swim comfort and month comparisons →
Typical May water temperature near Cancun is 27.4°C (81.3°F), with yearly monthly means from 27.0–27.9°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: April 27.1°C · June 28.4°C.
Explore Cancun sea temperature in May, including swim comfort and month comparisons →
Typical June water temperature near Cancun is 28.4°C (83.1°F), with yearly monthly means from 28.2–28.6°C.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: May 27.4°C · July 28.9°C.
Explore Cancun sea temperature in June, including swim comfort and month comparisons →
Typical July water temperature near Cancun is 28.9°C (84.0°F), with yearly monthly means from 28.6–29.2°C.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: June 28.4°C · August 28.9°C.
Explore Cancun sea temperature in July, including swim comfort and month comparisons →
Typical August water temperature near Cancun is 28.9°C (84.0°F), with yearly monthly means from 28.4–29.3°C.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: July 28.9°C · September 29.4°C.
Explore Cancun sea temperature in August, including swim comfort and month comparisons →
Typical September water temperature near Cancun is 29.4°C (84.9°F), with yearly monthly means from 29.2–29.6°C.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: August 28.9°C · October 29.4°C.
Explore Cancun sea temperature in September, including swim comfort and month comparisons →
Typical October water temperature near Cancun is 29.4°C (84.9°F), with yearly monthly means from 29.2–29.6°C.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: September 29.4°C · November 28.6°C.
Explore Cancun sea temperature in October, including swim comfort and month comparisons →
Typical November water temperature near Cancun is 28.6°C (83.5°F), with yearly monthly means from 28.6–28.7°C.
Swimming and snorkeling: very warm water. Swimwear is usually enough; a rash guard adds sun protection.
Adjacent months: October 29.4°C · December 27.6°C.
Explore Cancun sea temperature in November, including swim comfort and month comparisons →
Typical December water temperature near Cancun is 27.6°C (81.7°F), with yearly monthly means from 27.3–28.0°C.
Swimming and snorkeling: warm water. Most people are comfortable in swimwear or a light rash guard.
Adjacent months: November 28.6°C · January 26.8°C.
Explore Cancun sea temperature in December, including swim comfort and month comparisons →
These values come from hourly forecasts SnorkelForecast has stored. They cover only months with records and do not replace the historical baseline.
| Month | Min | Average | Max |
|---|---|---|---|
| September | 28.7°C / 83.7°F | 29.6°C / 85.3°F | 30.3°C / 86.5°F |
| October | 28.5°C / 83.3°F | 29.2°C / 84.6°F | 29.8°C / 85.6°F |
| November | 28.9°C / 84.0°F | 29.1°C / 84.4°F | 29.3°C / 84.7°F |
Partial coverage: 3 calendar months with records. Profile calculated from 1155 hourly forecast records across 3 monthly periods. This is a growing archive, not a long-term climate normal.
Cancun snorkel hub for comparing Isla Mujeres, Puerto Morelos and nearby reef forecasts. Hotel-zone beaches are often murkier than those reefs.
The current sea surface temperature near Cancun is 29.0°C (84.2°F). Over the last 30 days, the average has been 29.2°C.
The water is typically warmest in September, at around 29.4°C (84.9°F) in the 2022–2025 historical baseline.
The water is typically coldest in February, at around 26.7°C (80.1°F) in the same historical baseline.
At 29.0°C, the water is usually comfortable for swimming and snorkeling.
Prices and availability from Viator. Check conditions before you book.
We may earn a commission at no extra cost to you.
Free cancellation available
Free cancellation available
Free cancellation available
Free cancellation available
Free cancellation available
Free cancellation available
See how today's sea temperature, wave height, wind, and tides combine into a detailed snorkeling score for Cancun.
View Snorkel Forecast →