September weather forecastRuonala, Finland
September
Weather in September
The first month of the autumn, September, is still a refreshing month in Ruonala, Finland, with an average temperature ranging between max 14.8°C (58.6°F) and min 11.2°C (52.2°F).Temperature
The arrival of September signals a subtle shift in temperature, down from a comfortable 19.2°C (66.6°F) in August to a still refreshing 14.8°C (58.6°F). Ruonala sustains an average of approximately a cool 11.2°C (52.2°F) during September nights, with little variation from daytime highs.Humidity
The average relative humidity in September is 79%.Rainfall
In Ruonala, in September, during 16.4 rainfall days, 53mm (2.09") of precipitation is typically accumulated. Throughout the year, there are 158.3 rainfall days, and 571mm (22.48") of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 53min.On the first day of September, sunrise is at 06:07 and sunset at 20:17. On the last day of the month, sunrise is at 07:17 and sunset at 18:47 EEST.
Sunshine
In Ruonala, the average sunshine in September is 7.3h.UV index
In September, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: A maximum high daily UV index of 3 during September translates into the following directions:
Put precautions into practice - Guidance to elude sunburn is provided. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Ruonala, Finland
- Average high temperature in September: 14.8°C
The warmest month (with the highest average high temperature) is July (19.7°C).
The month with the lowest average high temperature is February (-2.7°C).
- Average low temperature in September: 11.2°C
The month with the highest average low temperature is July (15.1°C).
The coldest month (with the lowest average low temperature) is February (-6.3°C).
Average pressure in September
Ruonala, Finland
- Average pressure in September: 1013.4mbar
The month with the highest atmospheric pressure is May (1014.9mbar).
The month with the lowest atmospheric pressure is December (1008.9mbar).
Average wind speed in September
Ruonala, Finland
- Average wind speed in September: 19.3km/h
The windiest month (with the highest average wind speed) is December (23.7km/h).
The calmest month (with the lowest average wind speed) is July (15.5km/h).
Average humidity in September
Ruonala, Finland
- Average humidity in September: 79%
The month with the highest relative humidity is February (92%).
The month with the lowest relative humidity is May (73%).
Average rainfall in September
Ruonala, Finland
- Average rainfall in September: 53mm
The wettest month (with the highest rainfall) is August (67mm).
The driest month (with the least rainfall) is April (29mm).
Average rainfall days in September
Ruonala, Finland
- Average rainfall days in September: 16.4 days
The month with the highest number of rainy days is October (17.6 days).
The month with the least rainy days is February (5.6 days).
Average snowfall in September
Ruonala, Finland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (148mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Ruonala, Finland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (18.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Ruonala, Finland
- Average daylight in September: 12h and 54min
The month with the longest days is June (Average daylight: 18h and 54min).
The month with the shortest days is December (Average daylight: 5h and 54min).
- Average sunshine in September: 7h and 18min
The month with the most sunshine is June (Average sunshine: 12h and 30min).
The month with the least sunshine is December (Average sunshine: 1h and 36min).
Average sunshine days in September
Ruonala, Finland
- Average sunshine days in September: 9.5 days
The month with the most sunshine days is May (15.2 days).
The month with the least sunshine days is December (6.4 days).
Average UV index in September
Ruonala, 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
Ruonala, Finland
- Average cloud cover in September: 48
The months with the most cloud cover are January and December (Cloud cover 77).
The months with the least cloud cover are July and August (Cloud cover 37).
Average visibility in September
Ruonala, Finland
- Average visibility in September: 10km
The months with the highest visibility are May, June, July, August and September (10km).
The months with the lowest visibility are January, February, March and December (8km).
