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 sea temperature 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
Transitioning from August to September involves a subtle drop in average high-temperatures, descending from an enjoyable 16.5°C (61.7°F) to a fresh 12.2°C (54°F). During September, Keminmaa's nights hold steady with an average temperature of 8.4°C (47.1°F), barely dropping from the daytime highs.Humidity
In Keminmaa, the average relative humidity in September is 82%.Rainfall
In September, the rain falls for 14.6 days. Throughout September, 44mm (1.73") of precipitation is accumulated. In Keminmaa, Finland, during the entire year, the rain falls for 127 days and collects up to 472mm (18.58") of precipitation.Snowfall
July through September are months without snowfall.Sea temperature
In September, the average sea temperature in Keminmaa is 12.8°C (55°F).Note: Without suitable protection, venturing into 12.8°C (55°F) waters cooler than 10°C (50°F) can lead to pronounced cold shock and rapid breaths.
Daylight
In Keminmaa, the average length of the day in September is 13h and 6min.On the first day of the month, sunrise is at 05:59 and sunset at 20:43. On the last day of September, in Keminmaa, sunrise is at 07:30 and sunset at 18:52 EEST.
Sunshine
In September, the average sunshine is 7.1h.UV index
In September, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the average person.Note: In September, the maximum UV index of 3 transforms into these recommendations:
Put precautions into practice - Guidance to elude sunburn is provided. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Keminmaa?
What is the average humidity in September in Keminmaa?
How much does it rain in Keminmaa in September?
When it does not snow in Keminmaa?
Does it snow in Keminmaa in September?
What is the water temperature in September in Keminmaa?
What is the average length of the day in September in Keminmaa?
When is the sunrise / sunset in September in Keminmaa?
How long on average sun shines in September in Keminmaa?
What is the UV index intensity in September in Keminmaa?
Average temperature in September
Keminmaa, Finland
- Average high temperature in September: 12.2°C
The warmest month (with the highest average high temperature) is July (17.8°C).
The month with the lowest average high temperature is January (-6.3°C).
- Average low temperature in September: 8.4°C
The month with the highest average low temperature is July (12.6°C).
The coldest month (with the lowest average low temperature) is January (-10.7°C).
Average pressure in September
Keminmaa, Finland
- Average pressure in September: 1011mbar
The month with the highest atmospheric pressure is May (1013.9mbar).
The month with the lowest atmospheric pressure is December (1004.9mbar).
Average wind speed in September
Keminmaa, Finland
- Average wind speed in September: 16.5km/h
The windiest month (with the highest average wind speed) is November (17.7km/h).
The calmest month (with the lowest average wind speed) is April (12.4km/h).
Average humidity in September
Keminmaa, Finland
- Average humidity in September: 82%
The months with the highest relative humidity are January and February (94%).
The month with the lowest relative humidity is June (71%).
Average rainfall in September
Keminmaa, Finland
- Average rainfall in September: 44mm
The wettest month (with the highest rainfall) is August (53mm).
The driest month (with the least rainfall) is April (28mm).
Average rainfall days in September
Keminmaa, Finland
- Average rainfall days in September: 14.6 days
The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in September
Keminmaa, Finland
- Average snowfall in September: 0mm
The month with the highest snowfall is March (228mm).
The months with the least snowfall are July, August and September (0mm).
Average snowfall days in September
Keminmaa, Finland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (18.8 days).
The months with the least snowfall days are July, August and September (0 days).
Average sea temperature in September
Keminmaa, Finland
- Average sea temperature in September: 12.8°C
The best month for swimming (with the highest average sea temperature) is July (16.8°C).
The coldest months (with the lowest average sea temperature) are January and February (-0.7°C).
Average daylight in September /
Average sunshine in September
Keminmaa, Finland
- Average daylight in September: 13h and 1min
The month with the longest days is July (Average daylight: 20h and 42min).
The month with the shortest days is December (Average daylight: 3h and 18min).
- Average sunshine in September: 7h and 1min
The month with the most sunshine is July (Average sunshine: 12h and 18min).
The month with the least sunshine is December (Average sunshine: 1h and 6min).
Average sunshine days in September
Keminmaa, Finland
- Average sunshine days in September: 12.6 days
The month with the most sunshine days is October (13.9 days).
The month with the least sunshine days is December (9.9 days).
Average UV index in September
Keminmaa, 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, March, October and December (UV index 1).
Average cloud cover in September
Keminmaa, Finland
- Average cloud cover in September: 52
The month with the most cloud cover is January (Cloud cover 73).
The month with the least cloud cover is July (Cloud cover 40).
Average visibility in September
Keminmaa, Finland
- Average visibility in September: 9km
The months with the highest visibility are June, July and August (10km).
The months with the lowest visibility are January, February, March and April (7km).
Keminmaa, Finland
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