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
The onset of September coincides with a reduction in the average high-temperature, falling from an enjoyable 19.8°C (67.6°F) in August to a still refreshing 13.9°C (57°F). Throughout September nights, Jämsänkoski experiences a consistent temperature average of 7.5°C (45.5°F).Humidity
The average relative humidity in September in Jämsänkoski is 83%.Rainfall
In September, the rain falls for 12.5 days. Throughout September, 30mm (1.18") of precipitation is accumulated. In Jämsänkoski, during the entire year, the rain falls for 125.3 days and collects up to 390mm (15.35") of precipitation.Snowfall
January through June, September through December are months with snowfall. September is the first month it typically snows in Jämsänkoski. Throughout September, in the average 0.2 snowfall days, it receives 1mm (0.04") of snow. Throughout the year, there are 99.7 snowfall days, and 915mm (36.02") of snow is accumulated.Daylight
In Jämsänkoski, the average length of the day in September is 12h and 56min.On the first day of September, sunrise is at 06:10 and sunset at 20:27. On the last day of the month, sunrise is at 07:25 and sunset at 18:53 EEST.
Sunshine
In Jämsänkoski, the average sunshine in September is 6.6h.UV index
In Jämsänkoski, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: A maximum daily UV index of 3 during September morphs into the following directions:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Jämsänkoski?
What is the average humidity in September in Jämsänkoski?
How many days does it rain in September in Jämsänkoski?
When does it start snowing in Jämsänkoski?
How many hours of daylight does Jämsänkoski have in September?
When is the sunrise / sunset in September in Jämsänkoski?
How long on average sun shines in September in Jämsänkoski?
What is the UV index reading in September in Jämsänkoski?
Average temperature in September
Jämsänkoski, Finland
- Average high temperature in September: 13.9°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 (-4.9°C).
- Average low temperature in September: 7.5°C
The month with the highest average low temperature is July (12.3°C).
The coldest month (with the lowest average low temperature) is January (-9.2°C).
Average pressure in September
Jämsänkoski, Finland
- Average pressure in September: 1013mbar
The month with the highest atmospheric pressure is May (1014.6mbar).
The month with the lowest atmospheric pressure is December (1007.8mbar).
Average wind speed in September
Jämsänkoski, Finland
- Average wind speed in September: 11.2km/h
The windiest month (with the highest average wind speed) is December (13.1km/h).
The calmest month (with the lowest average wind speed) is July (9.9km/h).
Average humidity in September
Jämsänkoski, Finland
- Average humidity in September: 83%
The month with the highest relative humidity is February (95%).
The month with the lowest relative humidity is May (67%).
Average rainfall in September
Jämsänkoski, Finland
- Average rainfall in September: 30mm
The wettest month (with the highest rainfall) is July (45mm).
The driest month (with the least rainfall) is April (24mm).
Average rainfall days in September
Jämsänkoski, Finland
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is July (16.1 days).
The month with the least rainy days is February (3.5 days).
Average snowfall in September
Jämsänkoski, Finland
- Average snowfall in September: 1mm
The month with the highest snowfall is December (202mm).
The months with the least snowfall are July and August (0mm).
Average snowfall days in September
Jämsänkoski, Finland
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is January (20.3 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Jämsänkoski, Finland
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 19h and 30min).
The month with the shortest days is December (Average daylight: 5h and 24min).
- Average sunshine in September: 6h and 4min
The month with the most sunshine is June (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 0h and 54min).
Average sunshine days in September
Jämsänkoski, Finland
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is May (17.5 days).
The month with the least sunshine days is December (8.4 days).
Average UV index in September
Jämsänkoski, 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
Jämsänkoski, Finland
- Average cloud cover in September: 56
The month with the most cloud cover is January (Cloud cover 82).
The month with the least cloud cover is August (Cloud cover 43).
Average visibility in September
Jämsänkoski, 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).
