Alonnisos
Greece
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Alonnisos, Greece

Septiembre, the first month of the autumn, in Alonnisos, is still a warm month, with temperature in the range of an average low of 16°C (60.8°F) and an average high of 25°C (77°F).

Temperature

In Septiembre, the average high-temperature marginally drops, from a moderately hot 28°C (82.4°F) in Agosto, to a still warm 25°C (77°F). The average low-temperature, in Alonnisos, is 16°C (60.8°F).

Rainfall

In Alonnisos, it is raining for 3 days, with typically 46mm (1.81") of accumulated precipitation. Throughout the year, in Alonnisos, there are 79 rainfall days, and 725mm (28.54") of precipitation is accumulated.

Sea temperature

In Septiembre, the average sea temperature is 23°C (73.4°F).
Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 23°C (73.4°F) water. (FYI: The Olympic swimming competition requires a water temperature between 25°C (77°F) and 28°C (82.4°F).)

Daylight

In Septiembre, the average length of the day in Alonnisos is 12.4h.

Sunshine

In Alonnisos, the average sunshine in Septiembre is 10h.

UV index

In Alonnisos, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 6 in Septiembre transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in Septiembre in Alonnisos?

In Alonnisos, Greece, in Septiembre, the average high-temperature is 25°C (77°F), and the average low-temperature is 16°C (60.8°F).

How many days does it rain in Septiembre in Alonnisos?

In Alonnisos, during Septiembre, the rain falls for 3 days and regularly aggregates up to 46mm (1.81") of precipitation.

How warm is the water in Septiembre in Alonnisos?

In Septiembre, the average sea temperature in Alonnisos is 23°C (73.4°F). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 23°C (73.4°F) water may be enjoyable.

What is the average length of the day in Septiembre in Alonnisos?

In Alonnisos, Greece, the average length of the day in Septiembre is 12.4h.

How long on average sun shines in Septiembre in Alonnisos?

The average sunshine in Septiembre in Alonnisos, Greece, is 10h.

What is the UV index intensity in Septiembre in Alonnisos?

The average daily maximum UV index in Septiembre in Alonnisos is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to the UV radiation.
Average temperature in September - Alonnisos, Greece
  • Average high temperature in September: 25°C

Warmest months (with the highest average high temperature) are July and August (28°C).
The month with the lowest average high temperature is January (10°C).

  • Average low temperature in September: 16°C

Months with the highest average low temperature are July and August (19°C).
The coldest month (with the lowest average low temperature) is January (4°C).

Average rainfall in September - Alonnisos, Greece
  • Average rainfall in September: 46mm

The wettest month (with the highest rainfall) is December (119mm).
The driest month (with the lowest rainfall) is July (22mm).

Average rainfall days in September - Alonnisos, Greece
  • Average rainfall days in September: 3 days

The month with the highest number of rainy days is December (10 days).
Months with the lowest number of rainy days are July, August and September (3 days).

Average sea temperature in September - Alonnisos, Greece
  • Average sea temperature in September: 23°C

Best months for swimming (with the highest average sea temperature) are July and August (24°C).
Coldest months (with the lowest average sea temperature) are January, February and March (14°C).

Average daylight in September / Average sunshine in September - Alonnisos, Greece
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 10h

The month with most sunshine is July (Average sunshine: 13h).
Months with least sunshine are January and December (Average sunshine: 4).

Average UV index in September - Alonnisos, Greece
  • Average UV index in September: 6

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January, November and December (UV index 2).