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
The transition into September involves a decrease in the average high-temperature, falling from a refreshing 19.3°C (66.7°F) in August to a mild 13.5°C (56.3°F). In September, Joensuu reports a consistent average low-temperature of 7.6°C (45.7°F) during the nights.Humidity
The average relative humidity in September in Joensuu is 84%.Rainfall
In Joensuu, in September, during 16.5 rainfall days, 41mm (1.61") of precipitation is typically accumulated. Throughout the year, there are 127.5 rainfall days, and 461mm (18.15") of precipitation is accumulated.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 0.6 snowfall days, it receives 6mm (0.24") of snow. Throughout the year, in Joensuu, there are 120.8 snowfall days, and 1101mm (43.35") of snow is accumulated.Daylight
In September, the average length of the day in Joensuu is 12h and 58min.On the first day of September in Joensuu, sunrise is at 05:49 and sunset at 20:11. On the last day of the month, sunrise is at 07:07 and sunset at 18:34 EEST.
Sunshine
The average sunshine in September is 6.3h.UV index
In September, the average daily maximum UV index in Joensuu, Finland, is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: The daily high UV index of 2 in September translates into this advice:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Frequently asked questions
What are September temperatures in Joensuu?
What is the average humidity in September in Joensuu?
How many days does it rain in September in Joensuu?
When does it start to snow in Joensuu?
How many hours of daylight does Joensuu have in September?
When are sunrise and sunset in September in Joensuu?
How many hours of sunshine does Joensuu have in September?
How high is the UV index in September in Joensuu?
Average temperature in September
Joensuu, Finland
- Average high temperature in September: 13.5°C
The warmest month (with the highest average high temperature) is July (21.2°C).
The month with the lowest average high temperature is January (-6.4°C).
- Average low temperature in September: 7.6°C
The month with the highest average low temperature is July (12.5°C).
The coldest month (with the lowest average low temperature) is January (-10.4°C).
Average pressure in September
Joensuu, Finland
- Average pressure in September: 1012.9mbar
The month with the highest atmospheric pressure is May (1014.7mbar).
The month with the lowest atmospheric pressure is December (1008.6mbar).
Average wind speed in September
Joensuu, Finland
- Average wind speed in September: 11.8km/h
The windiest months (with the highest average wind speed) are November and December (13.8km/h).
The calmest month (with the lowest average wind speed) is July (10.2km/h).
Average humidity in September
Joensuu, Finland
- Average humidity in September: 84%
The month with the highest relative humidity is February (96%).
The months with the lowest relative humidity are May and June (68%).
Average rainfall in September
Joensuu, Finland
- Average rainfall in September: 41mm
The wettest month (with the highest rainfall) is July (66mm).
The driest month (with the least rainfall) is April (26mm).
Average rainfall days in September
Joensuu, Finland
- Average rainfall days in September: 16.5 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is February (2 days).
Average snowfall in September
Joensuu, Finland
- Average snowfall in September: 6mm
The months with the highest snowfall are March and December (202mm).
The months with the least snowfall are July and August (0mm).
Average snowfall days in September
Joensuu, Finland
- Average snowfall days in September: 0.6 days
The month with the highest number of snowfall days is December (22.3 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Joensuu, 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: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 0h and 42min).
Average sunshine days in September
Joensuu, Finland
- Average sunshine days in September: 10.4 days
The month with the most sunshine days is May (15 days).
The month with the least sunshine days is February (7.7 days).
Average UV index in September
Joensuu, Finland
- Average UV index in September: 2
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
Joensuu, Finland
- Average cloud cover in September: 59
The month with the most cloud cover is February (Cloud cover 84).
The month with the least cloud cover is July (Cloud cover 42).
Average visibility in September
Joensuu, 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).
Joensuu, Finland
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