September weather forecastViikki, Finland
September
Weather in September
September, the first month of the autumn in Viikki, is still a refreshing month, with an average temperature fluctuating between 11°C (51.8°F) and 15.1°C (59.2°F).Temperature
The shift from August to September includes a minor decrease in the average high-temperature, lightly dropping from an enjoyable 19.6°C (67.3°F) to a still refreshing 15.1°C (59.2°F). Viikki experiences a steady nighttime temperature of 11°C (51.8°F) throughout the month of September.Humidity
In Viikki, the average relative humidity in September is 79%.Rainfall
In Viikki, during September, the rain falls for 13.5 days and regularly aggregates up to 34mm (1.34") of precipitation. In Viikki, Finland, during the entire year, the rain falls for 144.6 days and collects up to 465mm (18.31") of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September in Viikki is 12h and 52min.On the first day of September in Viikki, sunrise is at 06:15 and sunset at 20:23. On the last day of the month, sunrise is at 07:24 and sunset at 18:55 EEST.
Sunshine
In Viikki, the average sunshine in September is 7.5h.UV index
In September, the average daily maximum UV index in Viikki is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The daily high UV index of 3 in September translates into this advice:
Make use of precautions - It is urged to ward off sun damage. When the Sun is at its strongest around midday, find shade and limit exposure. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Viikki, Finland
- Average high temperature in September: 15.1°C
The warmest month (with the highest average high temperature) is July (20.4°C).
The month with the lowest average high temperature is January (-2.2°C).
- Average low temperature in September: 11°C
The month with the highest average low temperature is July (14.5°C).
The coldest months (with the lowest average low temperature) are January and February (-5.5°C).
Average pressure in September
Viikki, Finland
- Average pressure in September: 1013.4mbar
The month with the highest atmospheric pressure is May (1014.9mbar).
The month with the lowest atmospheric pressure is December (1008.6mbar).
Average wind speed in September
Viikki, Finland
- Average wind speed in September: 17km/h
The windiest month (with the highest average wind speed) is December (21.1km/h).
The calmest month (with the lowest average wind speed) is May (13.7km/h).
Average humidity in September
Viikki, Finland
- Average humidity in September: 79%
The month with the highest relative humidity is February (91%).
The month with the lowest relative humidity is May (72%).
Average rainfall in September
Viikki, Finland
- Average rainfall in September: 34mm
The wettest month (with the highest rainfall) is July (51mm).
The driest month (with the least rainfall) is April (27mm).
Average rainfall days in September
Viikki, Finland
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is July (16.6 days).
The month with the least rainy days is February (6.4 days).
Average snowfall in September
Viikki, Finland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (159mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Viikki, Finland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (18.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Viikki, Finland
- Average daylight in September: 12h and 54min
The month with the longest days is June (Average daylight: 18h and 48min).
The month with the shortest days is December (Average daylight: 6h and 0min).
- Average sunshine in September: 7h and 30min
The month with the most sunshine is June (Average sunshine: 12h and 30min).
The month with the least sunshine is December (Average sunshine: 1h and 42min).
Average sunshine days in September
Viikki, Finland
- Average sunshine days in September: 13.6 days
The month with the most sunshine days is May (17 days).
The month with the least sunshine days is December (5.6 days).
Average UV index in September
Viikki, 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
Viikki, Finland
- Average cloud cover in September: 46
The month with the most cloud cover is December (Cloud cover 75).
The months with the least cloud cover are July and August (Cloud cover 36).
Average visibility in September
Viikki, Finland
- Average visibility in September: 10km
The months with the highest visibility are June, July, August and September (10km).
The months with the lowest visibility are January, February, March and December (8km).
