September weather forecastKaris, Finland
September
Weather in September
The first month of the autumn, September, is still a mild month in Karis, Finland, with an average temperature ranging between min 11.6°C (52.9°F) and max 15.1°C (59.2°F).Temperature
Karis in September experiences a gentle temperature dip, with average high-temperatures reducing from an enjoyable 19.2°C (66.6°F) in August to a still refreshing 15.1°C (59.2°F). During September, Karis's nighttime temperatures demonstrate a subtle cooling from daytime highs, stabilizing at a cool 11.6°C (52.9°F).Humidity
In September, the average relative humidity is 79%.Rainfall
In Karis, in September, during 16.8 rainfall days, 53mm (2.09") of precipitation is typically accumulated. In Karis, during the entire year, the rain falls for 165.7 days and collects up to 567mm (22.32") of precipitation.Snowfall
In Karis, snow does not fall in June through September.Daylight
In Karis, the average length of the day in September is 12h and 52min.On the first day of September in Karis, sunrise is at 06:21 and sunset at 20:28. On the last day of the month, sunrise is at 07:29 and sunset at 19:00 EEST.
Sunshine
In Karis, the average sunshine in September is 7.7h.UV index
In September, the average daily maximum UV index in Karis is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In September, the maximum UV index of 3 suggests these recommendations:
Act with care - The need to guard against sun damage is communicated. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Karis, Finland
- Average high temperature in September: 15.1°C
The warmest month (with the highest average high temperature) is July (19.4°C).
The month with the lowest average high temperature is January (-1.3°C).
- Average low temperature in September: 11.6°C
The month with the highest average low temperature is August (15°C).
The coldest month (with the lowest average low temperature) is January (-4.4°C).
Average pressure in September
Karis, Finland
- Average pressure in September: 1013.6mbar
The month with the highest atmospheric pressure is May (1015mbar).
The month with the lowest atmospheric pressure is December (1008.5mbar).
Average wind speed in September
Karis, Finland
- Average wind speed in September: 18.3km/h
The windiest month (with the highest average wind speed) is December (24km/h).
The calmest month (with the lowest average wind speed) is May (14.9km/h).
Average humidity in September
Karis, Finland
- Average humidity in September: 79%
The month with the highest relative humidity is February (90%).
The month with the lowest relative humidity is May (74%).
Average rainfall in September
Karis, Finland
- Average rainfall in September: 53mm
The wettest month (with the highest rainfall) is July (66mm).
The driest month (with the least rainfall) is April (26mm).
Average rainfall days in September
Karis, Finland
- Average rainfall days in September: 16.8 days
The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is February (7 days).
Average snowfall in September
Karis, Finland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (136mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Karis, Finland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (17.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Karis, Finland
- Average daylight in September: 12h and 54min
The month with the longest days is June (Average daylight: 18h and 42min).
The month with the shortest days is December (Average daylight: 6h and 0min).
- Average sunshine in September: 7h and 42min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is December (Average sunshine: 1h and 48min).
Average sunshine days in September
Karis, Finland
- Average sunshine days in September: 9.5 days
The month with the most sunshine days is May (15.4 days).
The month with the least sunshine days is December (5.4 days).
Average UV index in September
Karis, Finland
- Average UV index in September: 3
The months with the highest UV index are July and August (UV index 5).
The months with the lowest UV index are January, February and December (UV index 1).
Average cloud cover in September
Karis, Finland
- Average cloud cover in September: 46
The month with the most cloud cover is December (Cloud cover 75).
The months with the least cloud cover are July and August (Cloud cover 36).
Average visibility in September
Karis, Finland
- Average visibility in September: 10km
The months with the highest visibility are June, July, August and September (10km).
The months with the lowest visibility are January, February, March and December (8km).
