Updated Wed 01:16 (Europe/Athens)
Greece · Forecast updated Sep 23, 2026, 01:16 UTC
Current Sea Temperature
27.0°C
80.6°F
Warm water
Valid Sep 23, 2026, 01:16 (Europe/Athens). Source: stored Open-Meteo marine forecast. Temperature is not a safety rating or snorkel score.
Versus this month's average
0.9°C above
The typical September average is 26.1°C (79.0°F) from the historical baseline.
Recent trend
Cooling by 1.2°C
Seven-day average: 27.6°C, versus 28.8°C in the prior seven days.
What to wear
Warm water
Most people are comfortable in swimwear or a light rash guard.
Cold tolerance varies. Wind, session length, sunshine, and exertion also affect comfort; temperature alone does not describe sea conditions or replace the snorkel forecast.
In the historical baseline for Zakynthos, typical monthly averages range from about 16.6°C (61.9°F) in February to 27.0°C (80.6°F) in August.
Over the past 30 days, the average sea temperature in Zakynthos has been 28.6°C.
Northern Hemisphere. Summer is generally June–August; winter is December–February.
Typical monthly sea-surface temperature near Zakynthos, calculated from hourly observations for 2023–2025. This is not this site's forecast archive.
| Month | Typical range | Average |
|---|---|---|
| January | 17.2–17.9°C | 17.6°C / 63.7°F |
| February | 16.2–17.0°C | 16.6°C / 61.9°F |
| March | 16.0–17.0°C | 16.7°C / 62.1°F |
| April | 16.3–18.1°C | 17.2°C / 63.0°F |
| May | 18.7–19.9°C | 19.4°C / 66.9°F |
| June | 23.2–24.0°C | 23.7°C / 74.7°F |
| July | 26.0–27.1°C | 26.4°C / 79.5°F |
| August | 26.1–28.8°C | 27.0°C / 80.6°F |
| September | 25.5–26.7°C | 26.1°C / 79.0°F |
| October | 22.5–24.4°C | 23.3°C / 73.9°F |
| November | 21.2–22.1°C | 21.7°C / 71.1°F |
| December | 18.2–19.1°C | 18.6°C / 65.5°F |
Source: Open-Meteo Marine API, MeteoFrance sea-surface temperature dataset. Nearest sea grid cell (37.71, 20.71). 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 2023–2025 baseline. The range is the lowest and highest yearly monthly mean, not an hourly extreme.
Typical January water temperature near Zakynthos is 17.6°C (63.7°F), with yearly monthly means from 17.2–17.9°C.
Typical February water temperature near Zakynthos is 16.6°C (61.9°F), with yearly monthly means from 16.2–17.0°C.
Typical March water temperature near Zakynthos is 16.7°C (62.1°F), with yearly monthly means from 16.0–17.0°C.
Typical April water temperature near Zakynthos is 17.2°C (63.0°F), with yearly monthly means from 16.3–18.1°C.
Typical May water temperature near Zakynthos is 19.4°C (66.9°F), with yearly monthly means from 18.7–19.9°C.
Typical June water temperature near Zakynthos is 23.7°C (74.7°F), with yearly monthly means from 23.2–24.0°C.
Typical July water temperature near Zakynthos is 26.4°C (79.5°F), with yearly monthly means from 26.0–27.1°C.
Typical August water temperature near Zakynthos is 27.0°C (80.6°F), with yearly monthly means from 26.1–28.8°C.
Typical September water temperature near Zakynthos is 26.1°C (79.0°F), with yearly monthly means from 25.5–26.7°C.
Typical October water temperature near Zakynthos is 23.3°C (73.9°F), with yearly monthly means from 22.5–24.4°C.
Typical November water temperature near Zakynthos is 21.7°C (71.1°F), with yearly monthly means from 21.2–22.1°C.
Typical December water temperature near Zakynthos is 18.6°C (65.5°F), with yearly monthly means from 18.2–19.1°C.
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 |
|---|---|---|---|
| January | 16.6°C / 61.9°F | 17.3°C / 63.1°F | 18.4°C / 65.1°F |
| February | 16.2°C / 61.2°F | 16.5°C / 61.6°F | 16.8°C / 62.2°F |
| March | 16.0°C / 60.8°F | 16.4°C / 61.5°F | 17.0°C / 62.6°F |
| April | 15.9°C / 60.6°F | 17.1°C / 62.8°F | 19.2°C / 66.6°F |
| May | 18.0°C / 64.4°F | 19.5°C / 67.1°F | 22.8°C / 73.0°F |
| June | 21.5°C / 70.7°F | 24.2°C / 75.5°F | 27.1°C / 80.8°F |
| July | 25.1°C / 77.2°F | 27.0°C / 80.7°F | 29.3°C / 84.7°F |
| August | 26.6°C / 79.9°F | 28.2°C / 82.7°F | 29.6°C / 85.3°F |
| September | 25.0°C / 77.0°F | 27.3°C / 81.1°F | 29.8°C / 85.6°F |
| October | 21.0°C / 69.8°F | 22.3°C / 72.1°F | 25.1°C / 77.2°F |
| November | 19.9°C / 67.8°F | 21.1°C / 70.0°F | 22.1°C / 71.8°F |
| December | 18.4°C / 65.1°F | 19.0°C / 66.2°F | 19.9°C / 67.8°F |
Profile calculated from 9059 hourly forecast records across 13 monthly periods. This is a growing archive, not a long-term climate normal.
Crystal clear Ionian Sea waters
The current sea surface temperature near Zakynthos is 27.0°C (80.6°F). Over the last 30 days, the average has been 28.6°C.
The water is typically warmest in August, at around 27.0°C (80.6°F) in the 2023–2025 historical baseline.
The water is typically coldest in February, at around 16.6°C (61.9°F) in the same historical baseline. A wetsuit is usually recommended during this period.
At 27.0°C, the water is usually comfortable for swimming and snorkeling.
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