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
Transition from August to September is accompanied by a temperature drop, with average high-temperatures decreasing from an enjoyable 19°C (66.2°F) to a mild 13.3°C (55.9°F). During September, Viitasaari experiences a consistent low-temperature average of 7.5°C (45.5°F).Humidity
In Viitasaari, the average relative humidity in September is 83%.Rainfall
In September, in Viitasaari, the rain falls for 7.2 days. Throughout September, 19mm (0.75") of precipitation is accumulated. In Viitasaari, during the entire year, the rain falls for 83.1 days and collects up to 298mm (11.73") of precipitation.Snowfall
June through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 59min.On the first day of the month, sunrise is at 06:04 and sunset at 20:28. On the last day of September, in Viitasaari, sunrise is at 07:23 and sunset at 18:49 EEST.
Sunshine
In September, the average sunshine in Viitasaari, Finland, is 6.3h.UV index
In Viitasaari, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: During September, 3 as the daily maximum UV index converts into the following advice:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Viitasaari in September?
What is the average humidity in September in Viitasaari?
How many days does it rain in September in Viitasaari?
When it does not snow in Viitasaari?
Does it snow in Viitasaari in September?
What is the average length of the day in September in Viitasaari?
What time are sunrise and sunset in September in Viitasaari?
How long on average sun shines in September in Viitasaari?
What is the UV index reading in September in Viitasaari?
Average temperature in September
Viitasaari, Finland
- Average high temperature in September: 13.3°C
The warmest month (with the highest average high temperature) is July (20.8°C).
The month with the lowest average high temperature is January (-5.8°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 (-9.9°C).
Average pressure in September
Viitasaari, Finland
- Average pressure in September: 1012.4mbar
The month with the highest atmospheric pressure is May (1014.4mbar).
The month with the lowest atmospheric pressure is December (1007.2mbar).
Average wind speed in September
Viitasaari, Finland
- Average wind speed in September: 12.3km/h
The windiest month (with the highest average wind speed) is December (13.9km/h).
The calmest month (with the lowest average wind speed) is July (10.3km/h).
Average humidity in September
Viitasaari, Finland
- Average humidity in September: 83%
The months with the highest relative humidity are January and February (95%).
The months with the lowest relative humidity are May and June (68%).
Average rainfall in September
Viitasaari, Finland
- Average rainfall in September: 19mm
The wettest month (with the highest rainfall) is July (39mm).
The driest month (with the least rainfall) is April (17mm).
Average rainfall days in September
Viitasaari, Finland
- Average rainfall days in September: 7.2 days
The month with the highest number of rainy days is July (12.8 days).
The month with the least rainy days is February (2.7 days).
Average snowfall in September
Viitasaari, Finland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (198mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Viitasaari, Finland
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (21.9 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Viitasaari, Finland
- Average daylight in September: 13h and 0min
The month with the longest days is June (Average daylight: 20h and 6min).
The month with the shortest days is December (Average daylight: 4h and 54min).
- Average sunshine in September: 6h and 2min
The month with the most sunshine is June (Average sunshine: 11h and 42min).
The month with the least sunshine is December (Average sunshine: 0h and 54min).
Average sunshine days in September
Viitasaari, Finland
- Average sunshine days in September: 21.9 days
The month with the most sunshine days is October (22.4 days).
The month with the least sunshine days is January (9.3 days).
Average UV index in September
Viitasaari, 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
Viitasaari, Finland
- Average cloud cover in September: 57
The month with the most cloud cover is January (Cloud cover 82).
The month with the least cloud cover is July (Cloud cover 44).
Average visibility in September
Viitasaari, Finland
- Average visibility in September: 8km
The month with the highest visibility is June (10km).
The month with the lowest visibility is January (5km).
