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
September
Weather in September
Temperature
In September, the meteorological conditions alter, with the average high-temperature shifting from a refreshing 19.8°C (67.6°F) in August to a mild 13.6°C (56.5°F). Nighttime temperature dips to a mean of 7.1°C (44.8°F) during September.Humidity
In Sumiainen, the average relative humidity in September is 83%.Rainfall
In Sumiainen, during September, the rain falls for 13.2 days and regularly aggregates up to 34mm (1.34") of precipitation. Throughout the year, there are 121.2 rainfall days, and 403mm (15.87") of precipitation is accumulated.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows in Sumiainen. Throughout September, in the average 0.3 snowfall days, it receives 2mm (0.08") of snow. In Sumiainen, during the entire year, snow falls for 96 days and aggregates up to 932mm (36.69") of snow.Daylight
In September, the average length of the day is 12h and 58min.On the first day of the month, sunrise is at 06:04 and sunset at 20:26. On the last day of September, in Sumiainen, sunrise is at 07:22 and sunset at 18:49 EEST.
Sunshine
In Sumiainen, the average sunshine in September is 6.3h.UV index
In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: A maximum high UV index of 3 in September translates into the following recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Sumiainen in September?
What is the average humidity in September in Sumiainen?
How many days does it rain in September in Sumiainen?
When does it start snowing in Sumiainen?
What is the average length of the day in September in Sumiainen?
What time are sunrise and sunset in September in Sumiainen?
How many hours of sunshine does Sumiainen have in September?
How high is the UV index in September in Sumiainen?
Average temperature in September
Sumiainen, Finland
- Average high temperature in September: 13.6°C
The warmest month (with the highest average high temperature) is July (21.5°C).
The month with the lowest average high temperature is January (-5.5°C).
- Average low temperature in September: 7.1°C
The month with the highest average low temperature is July (12.2°C).
The coldest month (with the lowest average low temperature) is January (-9.7°C).
Average pressure in September
Sumiainen, Finland
- Average pressure in September: 1012.8mbar
The month with the highest atmospheric pressure is May (1014.5mbar).
The month with the lowest atmospheric pressure is December (1007.6mbar).
Average wind speed in September
Sumiainen, Finland
- Average wind speed in September: 10.9km/h
The windiest month (with the highest average wind speed) is December (12.5km/h).
The calmest month (with the lowest average wind speed) is July (9.6km/h).
Average humidity in September
Sumiainen, Finland
- Average humidity in September: 83%
The months with the highest relative humidity are January and February (95%).
The month with the lowest relative humidity is May (67%).
Average rainfall in September
Sumiainen, Finland
- Average rainfall in September: 34mm
The wettest month (with the highest rainfall) is July (50mm).
The driest months (with the least rainfall) are February and March (23mm).
Average rainfall days in September
Sumiainen, Finland
- Average rainfall days in September: 13.2 days
The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is February (2.3 days).
Average snowfall in September
Sumiainen, Finland
- Average snowfall in September: 2mm
The month with the highest snowfall is December (185mm).
The months with the least snowfall are July and August (0mm).
Average snowfall days in September
Sumiainen, Finland
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is December (19.3 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Sumiainen, Finland
- Average daylight in September: 13h and 0min
The month with the longest days is June (Average daylight: 19h and 54min).
The month with the shortest days is December (Average daylight: 5h and 6min).
- Average sunshine in September: 6h and 2min
The month with the most sunshine is June (Average sunshine: 11h and 30min).
The month with the least sunshine is December (Average sunshine: 0h and 48min).
Average sunshine days in September
Sumiainen, Finland
- Average sunshine days in September: 14 days
The month with the most sunshine days is May (16.3 days).
The month with the least sunshine days is December (9.6 days).
Average UV index in September
Sumiainen, 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
Sumiainen, Finland
- Average cloud cover in September: 58
The month with the most cloud cover is January (Cloud cover 83).
The months with the least cloud cover are July and August (Cloud cover 45).
Average visibility in September
Sumiainen, Finland
- Average visibility in September: 8km
The months with the highest visibility are May, June, July and August (9km).
The months with the lowest visibility are January and February (5km).
