Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
During the transition into September, Keimola observes a decrease in the average high-temperature, falling from an agreeable 20.3°C (68.5°F) in August to a refreshing 15.1°C (59.2°F). In Keimola, an average low-temperature of 9.8°C (49.6°F) is recorded during September nights.Humidity
The average relative humidity in September in Keimola is 80%.Rainfall
In September, in Keimola, the rain falls for 15.3 days. Throughout September, 37mm (1.46") of precipitation is accumulated. In Keimola, during the entire year, the rain falls for 120 days and collects up to 353mm (13.9") of precipitation.Snowfall
In Keimola, snow does not fall in June through September.Daylight
In Keimola, the average length of the day in September is 12h and 53min.On the first day of the month, sunrise is at 06:15 and sunset at 20:24. On the last day of September, sunrise is at 07:24 and sunset at 18:55 EEST.
Sunshine
The average sunshine in September is 7.5h.UV index
In September, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 3 during September translates into the following guidance:
Undertake protective steps - Preventing sun damage is advised. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Frequently asked questions
What is the usual temperature for Keimola in September?
What is the average humidity in September in Keimola?
How much does it rain in Keimola in September?
When it does not snow in Keimola?
Does it snow in Keimola in September?
How many hours of daylight does Keimola have in September?
When is the sunrise / sunset in September in Keimola?
How long on average sun shines in September in Keimola?
How high is the UV index in September in Keimola?
Average temperature in September
Keimola, 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
Keimola, 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
Keimola, 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
Keimola, 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
Keimola, 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
Keimola, 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
Keimola, 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
Keimola, 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
Keimola, Finland
- Average daylight in September: 12h and 5min
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 3min
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
Keimola, 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
Keimola, 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
Keimola, 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
Keimola, 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).
Keimola, Finland
Weather forecast for your location
2. Allow the app to use your location
