Athens
Greece
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Athens, Greece

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

Temperature

In Athens, the average high-temperature in September slightly decreases, from a tropical 31°C (87.8°F) in August, to a moderately hot 27°C (80.6°F). In Athens, Greece, the average low-temperature is 20.9°C (69.6°F).

Heat index

The average heat index in September is calculated to 27.9°C (82.2°F). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'feels like', 'real feel', or 'apparent temperature', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is individual, with diverse people perceiving weather differently for numerous reasons (wind, metabolic differences, differences in body mass, height, and shape), 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

In Athens, the average relative humidity 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, 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.

Sea temperature

In September, the average sea temperature is 25°C (77°F).
Note: For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

Daylight

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

Sunshine

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

UV index

The average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high threat to health from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. 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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in September in Athens?

The average high-temperature, in September, in Athens, is 27°C (80.6°F), while 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'), that combines air temperature and relative humidity, is appraised at 27.9°C (82.2°F).

What is the average humidity in September in Athens?

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

How many days does it rain in September in Athens?

In Athens, during September, the rain falls for 7.4 days and regularly aggregates up to 19mm (0.75") of precipitation.

When it does not snow in Athens?

In Athens snow does not fall in April through December.

How warm is the water in September in Athens?

In Athens, 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?

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

How long on average sun shines in September in Athens?

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

What is the UV index reading in September in Athens?

In Athens, Greece, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation.
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).

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%).

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).

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).

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).

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).

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).

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).

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).