Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
September
Weather in September
Temperature
In September, the average high-temperature marginally decreases from a hot 31°C (87.8°F) in August to a warm 27°C (80.6°F). Throughout September, an average low-temperature of 20.9°C (69.6°F) is expected in Athens, Greece.Heat index
The heat index for September is estimated at 28°C (82.4°F). Exposure and extended activity could potentially cause a state of fatigue and lead to heat cramps.Heat index guidelines indicate values are for light wind scenarios and shaded regions. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is a numerical representation of warmth when taking temperature and moisture levels into account. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. Awareness is key; direct sunlight can enhance the weather's impact, possibly boosting the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young ones are generally at greater risk than adults due to their limited sweating ability. In addition, their large skin surface relative to their small bodies and higher heat production from their activities add to their vulnerability.
Humidity
The average relative humidity in September is 58%.Rainfall
In Athens, in September, it is raining for 7.4 days, with typically 19mm (0.75") of accumulated precipitation. Throughout the year, in Athens, Greece, there are 98.9 rainfall days, and 348mm (13.7") of precipitation is accumulated.Snowfall
April through December are months without snowfall.Sea temperature
In Athens, the average seawater temperature in September is 25°C (77°F).Note: For swimming, diving, and enjoying other water activities, the range of 25°C (77°F) to 29°C (84.2°F) in water temperature is considered ideal, offering pleasure for extended periods without discomfort.
Daylight
In September, the average length of the day in Athens is 12h and 26min.On the first day of September, sunrise is at 06:55 and sunset at 19:54. On the last day of the month, sunrise is at 07:20 and sunset at 19:09 EEST.
Sunshine
In Athens, the average sunshine in September is 9.9h.UV index
In September, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for ordinary individuals.Note: An average maximum UV index of 6 in September leads to these recommendations:
Stay clear of intense sun exposure. Solar protection is of utmost significance. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Stay aware! UV radiation is magnified when reflecting off sand and water.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Athens in September?
What is the average humidity in September in Athens?
How many days does it rain in September in Athens?
When it does not snow in Athens?
How warm is the water in September in Athens?
What is the average length of the day in September in Athens?
When are sunrise and sunset in September in Athens?
How long on average sun shines in September in Athens?
What is the UV index intensity in September in Athens?
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 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).
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).
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).
The 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).
The 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: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 9h and 5min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).
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).
Average UV index in September
Athens, Greece
- Average UV index in September: 6
The 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).
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).
Average visibility in September
Athens, Greece
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
