September weather forecast
Zakinthos, Greece

The first month of the autumn, September, is also a moderately hot month in Zakinthos, Greece, with an average temperature varying between 27.6°C (81.7°F) and 18.8°C (65.8°F).
The ideal sea water temperature of 25.9°C (78.6°F) and only 2.8 rainfall days, with 25mm (0.98") of accumulated rainfall, makes September the best time for swimming and other water activities.

Temperature

September's arrival subtly correlates with a reduction in the average high-temperature, down from a hot 30.6°C (87.1°F) in August to a moderately hot 27.6°C (81.7°F). September brings an average low-temperature of 18.8°C (65.8°F) to Zakinthos.

Heat index

In September, the heat index is estimated at a tropical 30°C (86°F). Unrelenting activity during exposure could cause fatigue and potentially lead to heat cramps.
Note that heat index values are valued for light wind and location in the shade. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'feels like', reflects the blend of air temperature and relative humidity to give a temperature impression. Elements such as metabolic variations, being pregnant, and physical activity can impact one's weather perception. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children often lack awareness of the importance of taking breaks and rehydrating. The feeling of thirst is a late indication of dehydration, so maintaining hydration, especially during long periods of physical activity, is critical.

Humidity

In September, the average relative humidity in Zakinthos, Greece, is 66.7%.

Rainfall

In Zakinthos, during September, the rain falls for 2.8 days and regularly aggregates up to 25mm (0.98") of precipitation. In Zakinthos, during the entire year, the rain falls for 78.5 days and collects up to 943mm (37.13") of precipitation.

Sea temperature

In Zakinthos, in September, the average water temperature is 25.9°C (78.6°F).
Note: Engaging in swimming, diving, or other water activities is highly enjoyable in temperatures ranging from 25°C (77°F) to 29°C (84.2°F), without any unpleasant sensations for prolonged durations.

Daylight

In September, the average length of the day in Zakinthos is 12h and 26min.
On the first day of the month, sunrise is at 07:06 and sunset at 20:05. On the last day of September, sunrise is at 07:31 and sunset at 19:20 EEST.

Sunshine

The average sunshine in September in Zakinthos is 10h.

UV index

In Zakinthos, the average daily maximum UV index in September is 7. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: In September, a regular UV index of 7 translates into these guidelines:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Beware! Reflecting off water and sand, UV rays are much stronger.