September weather forecast and climate
Athens, Greece

The ancient city of Athens in Greece with a view of the Parthenon Temple
The ancient city of Athens in Greece with a view of the Parthenon Temple

Weather in September

The first month of the autumn, September, is also a moderately hot month in Athens, Greece, with average temperature fluctuating between 27°C (80.6°F) and 20.9°C (69.6°F).

Temperature

In Athens, the average high-temperature marginally drops, from a hot 31°C (87.8°F) in August, to a warm 27°C (80.6°F). In Athens, the average low-temperature is 20.9°C (69.6°F).

Heat index

In September, the average heat index is evaluated at 27.9°C (82.2°F). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'apparent temperature', or 'felt air temperature', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is individual, with diverse people perceiving weather differently for numerous reasons (wind, pregnancy, metabolic differences), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

The average relative humidity in Athens is 58%.

Rainfall

In September, in Athens, the rain falls for 7.4 days. Throughout September, 19mm (0.75") of precipitation is accumulated. In Athens, Greece, during the entire year, the rain falls for 98.9 days and collects up to 348mm (13.7") of precipitation.

Snowfall

April through December are months without snowfall in Athens.

Sea temperature

In Athens, the average water temperature is 25°C (77°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

In September, the average length of the day in Athens is 12.4h.

Sunshine

In September, the average sunshine is 9.9h.

UV index

In Athens, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from unprotected exposure to the Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in September in Athens?

In Athens, in September, the average high-temperature is 27°C (80.6°F), and the average low-temperature is 20.9°C (69.6°F). In September, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is evaluated at 27.9°C (82.2°F).

What is the average humidity in September in Athens?

In September, the average relative humidity in Athens is 58%.

How much does it rain in Athens in September?

In Athens, Greece, in September, during 7.4 rainfall days, 19mm (0.75") of precipitation is typically accumulated.

When it does not snow in Athens?

In Athens snow does not fall in April through December.

What is the water temperature in September in Athens?

In Athens, Greece, the average seawater temperature in September is 25°C (77°F). Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the average length of the day in September in Athens?

The average length of the day in September in Athens, Greece, is 12.4h.

How long on average sun shines in September in Athens?

In September, the average sunshine in Athens is 9.9h.

How high is the UV index in September in Athens?

In September, the average daily maximum UV index is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to the UV radiation.

Average temperature in September
Athens, Greece

Average temperature in September - Athens, Greece
  • Average high temperature in September: 27°C

The warmest month (with the highest average high temperature) is August (31°C).
The month with the lowest average high temperature is January (12.1°C).

  • Average low temperature in September: 20.9°C

The month with the highest average low temperature is August (23.8°C).
The coldest month (with the lowest average low temperature) is January (7.3°C).

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Average pressure in September
Athens, Greece

Average pressure in September - Athens, Greece
  • Average pressure in September: 1014.3mbar

The month with the highest atmospheric pressure is December (1018.2mbar).
The month with the lowest atmospheric pressure is July (1011.1mbar).

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Average wind speed in September
Athens, Greece

Average wind speed in September - Athens, Greece
  • Average wind speed in September: 13.2km/h

The windiest month (with the highest average wind speed) is August (16.3km/h).
The calmest month (with the lowest average wind speed) is May (11.6km/h).

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Average humidity in September
Athens, Greece

Average humidity in September - Athens, Greece
  • Average humidity in September: 58%

The month with the highest relative humidity is January (74%).
The month with the lowest relative humidity is August (50%).

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Average rainfall in September
Athens, Greece

Average rainfall in September - Athens, Greece
  • Average rainfall in September: 19mm

The wettest month (with the highest rainfall) is December (53mm).
The driest month (with the least rainfall) is August (4mm).

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Average rainfall days in September
Athens, Greece

Average rainfall days in September - Athens, Greece
  • Average rainfall days in September: 7.4 days

The month with the highest number of rainy days is January (11.3 days).
The month with the least rainy days is August (1.8 days).

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Average snowfall in September
Athens, Greece

Average snowfall in September - Athens, Greece
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (9mm).
Months with the least snowfall are April, May, June, July, August, September, October, November and December (0mm).

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Average snowfall days in September
Athens, Greece

Average snowfall days in September - Athens, Greece
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (0.9 days).
Months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

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Average sea temperature in September
Athens, Greece

Average sea temperature in September - Athens, Greece
  • Average sea temperature in September: 25°C

The best month for swimming (with the highest average sea temperature) is August (26.3°C).
The coldest month (with the lowest average sea temperature) is February (15°C).

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Average daylight in September /
Average sunshine in September
Athens, Greece

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

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in September: 9.9h

Months with the most sunshine are July and August (Average sunshine: 12h).
The month with the least sunshine is January (Average sunshine: 5.6h).

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Average sunshine days in September
Athens, Greece

Average sunshine days in September - Athens, Greece
  • Average sunshine days in September: 21.3 days

The month with the most sunshine days is August (28.5 days).
The month with the least sunshine days is February (14.1 days).

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Average UV index in September
Athens, Greece

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

Months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).

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Average cloud cover in September
Athens, Greece

Average cloud cover in September - Athens, Greece
  • Average cloud cover in September: 15

The month with the most cloud cover is January (Cloud cover 40).
The month with the least cloud cover is August (Cloud cover 6).

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Average visibility in September
Athens, Greece

Average visibility in September - Athens, Greece
  • Average visibility in September: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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