September weather forecastIstro, Greece
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Istro, Greece, with an average temperature varying between 25.9°C (78.6°F) and 22.2°C (72°F).Temperature
The weather during September records an average high-temperature of a still moderately hot 25.9°C (78.6°F), closely mirroring the preceding month. The temperature during September nights demonstrates a small drop from the daytime highs, settling to an average of 22.2°C (72°F).Humidity
In September, the average relative humidity is 67%.Rainfall
January through July, September through December are months with rainfall. September is the first month it rains. Throughout September, in the average 2.1 rainfall days, it receives 2mm (0.08") of precipitation. In Istro, during the entire year, the rain falls for 64.8 days and collects up to 119mm (4.69") of precipitation.Sea temperature
In September, the average sea temperature is 24°C (75.2°F).Note: Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 24°C (75.2°F) water may be enjoyable. (FYI: The official water temperature required for the Olympic swimming competition is 25°C (77°F) to 28°C (82.4°F).)
Daylight
In September, the average length of the day is 12h and 24min.On the first day of September, sunrise is at 06:49 and sunset at 19:43. On the last day of the month, sunrise is at 07:11 and sunset at 19:02 EEST.
Sunshine
In Istro, the average sunshine in September is 11h.UV index
The average daily maximum UV index in September in Istro is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the average person.Note: The UV index of 6 in September translates into these instructions:
Enforce precautions and stick to sun safety measures. Preservation from skin and eye damage is essential. Be aware that the sun's UV radiation is strongest between 10 a.m. and 4 p.m. and try to reduce direct sun exposure during this period as much as possible. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Attention! The combination of sand and water reflections enhances UV ray intensity.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Istro, Greece
- Average high temperature in September: 25.9°C
The warmest month (with the highest average high temperature) is August (28.1°C).
The month with the lowest average high temperature is January (14.2°C).
- Average low temperature in September: 22.2°C
The month with the highest average low temperature is August (23.7°C).
The coldest month (with the lowest average low temperature) is January (11.5°C).
Average pressure in September
Istro, Greece
- Average pressure in September: 1013mbar
The month with the highest atmospheric pressure is December (1017.9mbar).
The month with the lowest atmospheric pressure is July (1009mbar).
Average wind speed in September
Istro, Greece
- Average wind speed in September: 15.2km/h
The windiest month (with the highest average wind speed) is January (20.6km/h).
The calmest month (with the lowest average wind speed) is May (12.6km/h).
Average humidity in September
Istro, Greece
- Average humidity in September: 67%
The months with the highest relative humidity are January, February and December (72%).
The month with the lowest relative humidity is July (65%).
Average rainfall in September
Istro, Greece
- Average rainfall in September: 2mm
The wettest month (with the highest rainfall) is January (25mm).
The driest month (with the least rainfall) is August (0mm).
Average rainfall days in September
Istro, Greece
- Average rainfall days in September: 2.1 days
The month with the highest number of rainy days is December (10.4 days).
The month with the least rainy days is August (0.4 days).
Average sea temperature in September
Istro, Greece
- Average sea temperature in September: 24°C
The best month for swimming (with the highest average sea temperature) is August (25°C).
The coldest months (with the lowest average sea temperature) are February and March (15°C).
Average daylight in September /
Average sunshine in September
Istro, Greece
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 11h and 0min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 6h and 24min).
Average sunshine days in September
Istro, Greece
- Average sunshine days in September: 26.9 days
The months with the most sunshine days are July and August (30.3 days).
The month with the least sunshine days is January (15.9 days).
Average UV index in September
Istro, Greece
- Average UV index in September: 6
The months with the highest UV index are July and August (UV index 7).
The months with the lowest UV index are January, February, March and December (UV index 4).
Average cloud cover in September
Istro, Greece
- Average cloud cover in September: 7
The month with the most cloud cover is January (Cloud cover 31).
The months with the least cloud cover are July and August (Cloud cover 2).
Average visibility in September
Istro, 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).
