September weather forecastKerava, Finland
September
Weather in September
A dynamic shift marks the weather in Kerava in September, manifested in temperatures dropping to a high of 15.1°C (59.2°F). Simultaneously, the cloud cover multiplies ensuring decreased hours of sunshine thereby initiating darker, longer nights. The city witnesses a steady retreat of summer, with rainfall persisting but temperatures falling markedly. September also observes an acceleration in wind speeds, bringing along a chill, precursory to the forthcoming colder months. This period witnesses the aura of fall descend over the cityscape, painting it with shades of orange, brown, and red.Temperature
The onset of September in Kerava results in a decrease in the average high-temperature, receding from a pleasant 20.3°C (68.5°F) in August to a moderate 15.1°C (59.2°F). During September, Kerava sees a mean low-temperature of 9.8°C (49.6°F).Humidity
In Kerava, the average relative humidity in September is 80%.Rainfall
In September, the rain falls for 15.3 days. Throughout September, 37mm (1.46") of precipitation is accumulated. Throughout the year, there are 120 rainfall days, and 353mm (13.9") of precipitation is accumulated.Snowfall
In Kerava, snow does not fall in June through September.Daylight
In September, the average length of the day in Kerava, Finland, is 12h and 53min.On the first day of the month, sunrise is at 06:14 and sunset at 20:24. On the last day of September, sunrise is at 07:24 and sunset at 18:54 EEST.
Sunshine
In Kerava, the average sunshine in September is 7.5h.UV index
In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum high daily UV index of 3 during September translates into the following directions:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Kerava, Finland
- Average high temperature in September: 15.1°C
The warmest month (with the highest average high temperature) is July (21.3°C).
The month with the lowest average high temperature is January (-2.8°C).
- Average low temperature in September: 9.8°C
The month with the highest average low temperature is July (13.7°C).
The coldest month (with the lowest average low temperature) is January (-6.5°C).
Average pressure in September
Kerava, Finland
- Average pressure in September: 1013.5mbar
The month with the highest atmospheric pressure is May (1014.9mbar).
The month with the lowest atmospheric pressure is December (1008.6mbar).
Average wind speed in September
Kerava, Finland
- Average wind speed in September: 13.9km/h
The windiest month (with the highest average wind speed) is December (16.9km/h).
The calmest month (with the lowest average wind speed) is July (11.8km/h).
Average humidity in September
Kerava, Finland
- Average humidity in September: 80%
The month with the highest relative humidity is February (92%).
The month with the lowest relative humidity is May (69%).
Average rainfall in September
Kerava, Finland
- Average rainfall in September: 37mm
The wettest month (with the highest rainfall) is October (48mm).
The driest month (with the least rainfall) is May (15mm).
Average rainfall days in September
Kerava, Finland
- Average rainfall days in September: 15.3 days
The months with the highest number of rainy days are July and August (15.5 days).
The month with the least rainy days is February (3 days).
Average snowfall in September
Kerava, Finland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (94mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Kerava, Finland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Kerava, 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 30min
The month with the most sunshine is June (Average sunshine: 12h and 24min).
The month with the least sunshine is December (Average sunshine: 1h and 54min).
Average sunshine days in September
Kerava, Finland
- Average sunshine days in September: 11.9 days
The month with the most sunshine days is May (21.9 days).
The month with the least sunshine days is November (11.1 days).
Average UV index in September
Kerava, 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
Kerava, Finland
- Average cloud cover in September: 47
The months with the most cloud cover are February and December (Cloud cover 75).
The months with the least cloud cover are July and August (Cloud cover 37).
Average visibility in September
Kerava, 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 February and March (7km).
