September weather forecastKoiskala, Finland
September
Weather in September
The first month of the autumn, September, is still a refreshing month in Koiskala, Finland, with an average temperature fluctuating between 7.7°C (45.9°F) and 14.9°C (58.8°F).Temperature
With September's onset, the average high-temperature recedes from August's pleasant 20.3°C (68.5°F) to a mild 14.9°C (58.8°F). In Koiskala, September nights witness a steady temperature drop to a frosty 7.7°C (45.9°F).Humidity
In Koiskala, the average relative humidity in September is 83%.Rainfall
In September, the rain falls for 11.2 days. Throughout September, 31mm (1.22") of precipitation is accumulated. Throughout the year, in Koiskala, there are 118.7 rainfall days, and 398mm (15.67") of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows in Koiskala. Throughout September, in the average 0.1 snowfall days, it receives 1mm (0.04") of snow. Throughout the year, in Koiskala, there are 93.7 snowfall days, and 918mm (36.14") of snow is accumulated.Daylight
The average length of the day in September is 12h and 54min.On the first day of September, sunrise is at 06:10 and sunset at 20:22. On the last day of the month, sunrise is at 07:21 and sunset at 18:51 EEST.
Sunshine
In September, the average sunshine is 6.5h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: A maximum UV index of 3 in September translates into the following recommendations:
Exercise prevention - Precautions against solar damage are endorsed. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Koiskala, Finland
- Average high temperature in September: 14.9°C
The warmest month (with the highest average high temperature) is July (22°C).
The month with the lowest average high temperature is January (-4.5°C).
- Average low temperature in September: 7.7°C
The month with the highest average low temperature is July (12.4°C).
The coldest month (with the lowest average low temperature) is January (-8.9°C).
Average pressure in September
Koiskala, Finland
- Average pressure in September: 1013.2mbar
The month with the highest atmospheric pressure is May (1014.8mbar).
The month with the lowest atmospheric pressure is December (1008.4mbar).
Average wind speed in September
Koiskala, Finland
- Average wind speed in September: 10.4km/h
The windiest month (with the highest average wind speed) is December (12km/h).
The calmest month (with the lowest average wind speed) is August (9.4km/h).
Average humidity in September
Koiskala, Finland
- Average humidity in September: 83%
The month with the highest relative humidity is February (95%).
The month with the lowest relative humidity is May (67%).
Average rainfall in September
Koiskala, Finland
- Average rainfall in September: 31mm
The wettest month (with the highest rainfall) is July (46mm).
The driest month (with the least rainfall) is April (24mm).
Average rainfall days in September
Koiskala, Finland
- Average rainfall days in September: 11.2 days
The month with the highest number of rainy days is July (14.3 days).
The month with the least rainy days is February (3.7 days).
Average snowfall in September
Koiskala, Finland
- Average snowfall in September: 1mm
The month with the highest snowfall is January (196mm).
The months with the least snowfall are June, July and August (0mm).
Average snowfall days in September
Koiskala, Finland
- Average snowfall days in September: 0.1 days
The months with the highest number of snowfall days are January and December (18.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Koiskala, Finland
- Average daylight in September: 12h and 54min
The month with the longest days is June (Average daylight: 19h and 6min).
The month with the shortest days is December (Average daylight: 5h and 42min).
- Average sunshine in September: 6h and 30min
The month with the most sunshine is June (Average sunshine: 11h and 36min).
The month with the least sunshine is December (Average sunshine: 1h and 24min).
Average sunshine days in September
Koiskala, Finland
- Average sunshine days in September: 16.8 days
The months with the most sunshine days are May and August (17.6 days).
The month with the least sunshine days is December (8.4 days).
Average UV index in September
Koiskala, Finland
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in September
Koiskala, Finland
- Average cloud cover in September: 57
The months with the most cloud cover are January and February (Cloud cover 81).
The month with the least cloud cover is August (Cloud cover 44).
Average visibility in September
Koiskala, Finland
- Average visibility in September: 8km
The months with the highest visibility are May, June, July and August (9km).
The months with the lowest visibility are January and February (5km).
