Month-specific sea-surface temperature · Honduras

Roatán Sea Temperature in September

30.3°C

86.5°F

In September, sea-surface temperature near Roatán 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 29.8–30.6°C. These are not daily extremes.

Previous month

August · 29.7°C

Change into September: +0.6°C

Next month

October · 30.1°C

Change into next month: -0.2°C

Can you swim or snorkel in Roatán 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.

Morning calm hours

23%

Afternoon calm hours

33%

Historical coverage

September 2026

30 valid days

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.

Utila 30.5°C

Roatán 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 27.7°C April 27.8°C May 28.7°C June 29.1°C July 28.9°C August 29.7°C September 30.3°C October 30.1°C November 28.8°C December 28.1°C

Data source and limitations

Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature; 2023–2025. Marine model grid near 16.30, -86.53. 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.