September weather forecastBjörby, Finland
September weather for Björby, Finland: The first month of the autumn, September, is still a mild month in Björby, Finland, with an average temperature fluctuating between 12.7°C (54.9°F) and 14.5°C (58.1°F). In Björby, Finland, in September, during 12.5 rainfall days, 28mm (1.1") of precipitation is typically accumulated.
September
Weather in September
The first month of the autumn, September, is still a mild month in Björby, Finland, with an average temperature fluctuating between 12.7°C (54.9°F) and 14.5°C (58.1°F).Temperature
With the onset of September, Björby experiences a modest temperature adjustment, with the average high-temperature gently receding from 17.6°C (63.7°F) in August to a still refreshing 14.5°C (58.1°F). Maintaining close parity with daytime warmth, the average nocturnal temperature during September stays at a fresh 12.7°C (54.9°F).Humidity
In Björby, the average relative humidity in September is 79%.Rainfall
In Björby, in September, it is raining for 12.5 days, with typically 28mm (1.1") of accumulated precipitation. Throughout the year, in Björby, there are 116.3 rainfall days, and 274mm (10.79") of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 52min.On the first day of the month, sunrise is at 06:35 and sunset at 20:43. On the last day of September, sunrise is at 07:44 and sunset at 19:14 EEST.
Sunshine
In Björby, the average sunshine in September is 7.8h.UV index
The average daily maximum UV index in September in Björby is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: In September, a daily UV index of 4 turns into the following recommendations:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Björby, Finland
- Average high temperature in September: 14.5°C
The warmest month (with the highest average high temperature) is August (17.6°C).
The month with the lowest average high temperature is February (0.5°C).
- Average low temperature in September: 12.7°C
The month with the highest average low temperature is August (15.9°C).
The coldest month (with the lowest average low temperature) is February (-1.5°C).
Average pressure in September
Björby, Finland
- Average pressure in September: 1013.1mbar
The month with the highest atmospheric pressure is May (1014.9mbar).
The month with the lowest atmospheric pressure is December (1007.4mbar).
Average wind speed in September
Björby, Finland
- Average wind speed in September: 25.1km/h
The windiest month (with the highest average wind speed) is December (31.7km/h).
The calmest month (with the lowest average wind speed) is July (20km/h).
Average humidity in September
Björby, Finland
- Average humidity in September: 79%
The month with the highest relative humidity is February (84%).
The months with the lowest relative humidity are August and October (78%).
Average rainfall in September
Björby, Finland
- Average rainfall in September: 28mm
The wettest month (with the highest rainfall) is October (32mm).
The driest month (with the least rainfall) is April (11mm).
Average rainfall days in September
Björby, Finland
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is August (14.2 days).
The month with the least rainy days is February (3.8 days).
Average snowfall in September
Björby, Finland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (44mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Björby, Finland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Björby, Finland
- Average daylight in September: 12h and 54min
The month with the longest days is June (Average daylight: 18h and 48min).
The month with the shortest days is December (Average daylight: 6h and 0min).
- Average sunshine in September: 7h and 48min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 2h and 12min).
Average sunshine days in September
Björby, Finland
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is May (20.5 days).
The month with the least sunshine days is December (11.1 days).
Average UV index in September
Björby, Finland
- Average UV index in September: 4
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February and March (UV index 1).
Average cloud cover in September
Björby, Finland
- Average cloud cover in September: 43
The month with the most cloud cover is January (Cloud cover 71).
The months with the least cloud cover are July and August (Cloud cover 35).
Average visibility in September
Björby, Finland
- Average visibility in September: 10km
The months with the highest visibility are April, May, June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March, November and December (9km).
