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
September's arrival corresponds with a decrease in average high-temperatures, from August's pleasant 20.4°C (68.7°F) to a refreshing 14.9°C (58.8°F). In the month of September, Iitti records a consistent average low-temperature of 8.3°C (46.9°F).Humidity
In September, the average relative humidity is 82%.Rainfall
In Iitti, during September, the rain falls for 13.2 days and regularly aggregates up to 32mm (1.26") of precipitation. Throughout the year, in Iitti, Finland, there are 131.9 rainfall days, and 451mm (17.76") of precipitation is accumulated.Snowfall
In Iitti, snow does not fall in June through September.Daylight
The average length of the day in September in Iitti is 12h and 54min.On the first day of the month, sunrise is at 06:08 and sunset at 20:20. On the last day of September, sunrise is at 07:19 and sunset at 18:49 EEST.
Sunshine
In September, the average sunshine is 7.1h.UV index
The average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.Note: An average UV index of 3 in September transforms into this advice:
Prioritize safety - Recommendations to avert sunburn are shared. The Sun's radiation is especially intense around midday; try to stay in shade during this period. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Iitti?
What is the average humidity in September in Iitti?
How much does it rain in Iitti in September?
When it does not snow in Iitti?
Does it snow in Iitti in September?
How many hours of daylight does Iitti have in September?
When are sunrise and sunset in September in Iitti?
How many hours of sunshine does Iitti have in September?
What is the UV index reading in September in Iitti?
Average temperature in September
Iitti, Finland
- Average high temperature in September: 14.9°C
The warmest month (with the highest average high temperature) is July (21.6°C).
The month with the lowest average high temperature is January (-4.3°C).
- Average low temperature in September: 8.3°C
The month with the highest average low temperature is July (13°C).
The coldest month (with the lowest average low temperature) is January (-8.3°C).
Average pressure in September
Iitti, Finland
- Average pressure in September: 1013.4mbar
The month with the highest atmospheric pressure is May (1014.8mbar).
The month with the lowest atmospheric pressure is December (1008.7mbar).
Average wind speed in September
Iitti, Finland
- Average wind speed in September: 11.6km/h
The windiest month (with the highest average wind speed) is December (13.8km/h).
The calmest month (with the lowest average wind speed) is August (10.7km/h).
Average humidity in September
Iitti, Finland
- Average humidity in September: 82%
The month with the highest relative humidity is February (95%).
The month with the lowest relative humidity is May (68%).
Average rainfall in September
Iitti, Finland
- Average rainfall in September: 32mm
The wettest month (with the highest rainfall) is July (51mm).
The driest month (with the least rainfall) is April (25mm).
Average rainfall days in September
Iitti, Finland
- Average rainfall days in September: 13.2 days
The month with the highest number of rainy days is July (16.9 days).
The month with the least rainy days is February (3.5 days).
Average snowfall in September
Iitti, Finland
- Average snowfall in September: 0mm
The month with the highest snowfall is February (231mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Iitti, Finland
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (21.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Iitti, Finland
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 19h and 6min).
The month with the shortest days is December (Average daylight: 5h and 48min).
- Average sunshine in September: 7h and 1min
The month with the most sunshine is June (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 1h and 12min).
Average sunshine days in September
Iitti, Finland
- Average sunshine days in September: 13.5 days
The month with the most sunshine days is May (17.3 days).
The month with the least sunshine days is December (5.5 days).
Average UV index in September
Iitti, Finland
- Average UV index in September: 3
The months with the highest UV index are June and 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
Iitti, Finland
- Average cloud cover in September: 52
The months with the most cloud cover are January and February (Cloud cover 80).
The months with the least cloud cover are July and August (Cloud cover 40).
Average visibility in September
Iitti, Finland
- Average visibility in September: 9km
The months with the highest visibility are May, June, July, August and September (9km).
The months with the lowest visibility are January, February and March (6km).
