September weather forecastKeratsini, Greece
September
Weather in September
The first month of the autumn, September, is still a warm month in Keratsini, Greece, with an average temperature varying between 21°C (69.8°F) and 27.2°C (81°F).Temperature
September's onset brings a negligible change in high-temperatures, falling from a tropical 30.8°C (87.4°F) in August to a moderately hot 27.2°C (81°F). September brings Keratsini a consistent average low-temperature of 21°C (69.8°F).Heat index
In September, the heat index is evaluated at 28°C (82.4°F). If exposure and ongoing activity persist, they might induce a state of tiredness and heat cramps.Observations indicate that the heat index values are for shady locations with light wind. The heat index can potentially augment by 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. An individual's temperature experience can be influenced by extra factors, including metabolic differences, activity levels, and clothing. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
Humidity
The average relative humidity in September is 58%.Rainfall
In Keratsini, in September, it is raining for 7.3 days, with typically 19mm (0.75") of accumulated precipitation. In Keratsini, during the entire year, the rain falls for 88.8 days and collects up to 263mm (10.35") of precipitation.Snowfall
In Keratsini, snow does not fall in April through November.Sea temperature
In Keratsini, Greece, in September, the average water temperature is 25°C (77°F).Note: Swimming, diving, and other water endeavors at temperatures between 25°C (77°F) and 29°C (84.2°F) are considered enjoyable and satisfying for extended periods without discomfort.
Daylight
In September, the average length of the day in Keratsini is 12h and 26min.On the first day of September in Keratsini, 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 19:10 EEST.
Sunshine
In Keratsini, Greece, the average sunshine in September is 9.9h.UV index
In Keratsini, Greece, 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 exposure to the Sun's UV radiation for the ordinary person.Note: In September, a regular UV index of 6 translates into these guidelines:
Refrain from overexposure. Fair-skinned individuals could burn in under 20 minutes. 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. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Notice! The reflection of water and sand increases the UV radiation significantly.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Keratsini, Greece
- Average high temperature in September: 27.2°C
The warmest month (with the highest average high temperature) is July (31.1°C).
The month with the lowest average high temperature is January (11.9°C).
- Average low temperature in September: 21°C
The month with the highest average low temperature is August (24.1°C).
The coldest month (with the lowest average low temperature) is January (7.2°C).
Average pressure in September
Keratsini, Greece
- Average pressure in September: 1014.4mbar
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
Keratsini, Greece
- Average wind speed in September: 12.7km/h
The windiest month (with the highest average wind speed) is August (15.7km/h).
The calmest month (with the lowest average wind speed) is May (11.4km/h).
Average humidity in September
Keratsini, Greece
- Average humidity in September: 58%
The month with the highest relative humidity is January (73%).
The months with the lowest relative humidity are July and August (50%).
Average rainfall in September
Keratsini, Greece
- Average rainfall in September: 19mm
The wettest month (with the highest rainfall) is December (39mm).
The driest month (with the least rainfall) is August (4mm).
Average rainfall days in September
Keratsini, Greece
- Average rainfall days in September: 7.3 days
The month with the highest number of rainy days is March (9.9 days).
The month with the least rainy days is August (2 days).
Average snowfall in September
Keratsini, Greece
- Average snowfall in September: 0mm
The months with the highest snowfall are January, February and December (4mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Keratsini, 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
Keratsini, 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
Keratsini, Greece
- Average daylight in September: 12h and 24min
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 54min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 42min).
Average sunshine days in September
Keratsini, Greece
- Average sunshine days in September: 21 days
The month with the most sunshine days is August (27.5 days).
The month with the least sunshine days is February (16.3 days).
Average UV index in September
Keratsini, 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
Keratsini, Greece
- Average cloud cover in September: 15
The month with the most cloud cover is January (Cloud cover 39).
The month with the least cloud cover is August (Cloud cover 7).
Average visibility in September
Keratsini, 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).
