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
In Ilomantsi, the average high-temperature in September drops from 19.2°C (66.6°F) in August to a still refreshing 13°C (55.4°F). September brings an average low-temperature of 6.1°C (43°F) to Ilomantsi.Humidity
In September, the average relative humidity in Ilomantsi is 86%.Rainfall
In Ilomantsi, in September, it is raining for 13 days, with typically 32mm (1.26") of accumulated precipitation. Throughout the year, there are 111.3 rainfall days, and 434mm (17.09") of precipitation is accumulated.Snowfall
Months with snowfall in Ilomantsi, Finland, are January through June, September through December. September is the first month it typically snows in Ilomantsi. Throughout September, in the average 0.9 snowfall days, it receives 8mm (0.31") of snow. In Ilomantsi, during the entire year, snow falls for 126.9 days and aggregates up to 1352mm (53.23") of snow.Daylight
In September, the average length of the day is 12h and 58min.On the first day of September in Ilomantsi, sunrise is at 05:45 and sunset at 20:07. On the last day of the month, sunrise is at 07:02 and sunset at 18:29 EEST.
Sunshine
The average sunshine in September is 5.7h.UV index
In Ilomantsi, Finland, the average daily maximum UV index in September is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for the average person.Note: The maximum UV index of 2 during September leads to these instructions:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Ilomantsi?
What is the average humidity in September in Ilomantsi?
How many days does it rain in September in Ilomantsi?
When does it start to snow in Ilomantsi?
What is the average length of the day in September in Ilomantsi?
When is the sunrise / sunset in September in Ilomantsi?
How many hours of sunshine does Ilomantsi have in September?
How high is the UV index in September in Ilomantsi?
Average temperature in September
Ilomantsi, Finland
- Average high temperature in September: 13°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 (-7.2°C).
- Average low temperature in September: 6.1°C
The month with the highest average low temperature is July (11.6°C).
The coldest month (with the lowest average low temperature) is January (-11.7°C).
Average pressure in September
Ilomantsi, Finland
- Average pressure in September: 1013mbar
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
Ilomantsi, Finland
- Average wind speed in September: 10.7km/h
The windiest month (with the highest average wind speed) is December (12.1km/h).
The calmest month (with the lowest average wind speed) is July (9.7km/h).
Average humidity in September
Ilomantsi, Finland
- Average humidity in September: 86%
The months with the highest relative humidity are January and February (96%).
The months with the lowest relative humidity are May and June (68%).
Average rainfall in September
Ilomantsi, Finland
- Average rainfall in September: 32mm
The wettest month (with the highest rainfall) is July (52mm).
The driest month (with the least rainfall) is June (25mm).
Average rainfall days in September
Ilomantsi, Finland
- Average rainfall days in September: 13 days
The month with the highest number of rainy days is July (14.7 days).
The month with the least rainy days is February (2 days).
Average snowfall in September
Ilomantsi, Finland
- Average snowfall in September: 8mm
The month with the highest snowfall is December (279mm).
The months with the least snowfall are July and August (0mm).
Average snowfall days in September
Ilomantsi, Finland
- Average snowfall days in September: 0.9 days
The month with the highest number of snowfall days is December (23.8 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Ilomantsi, 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: 5h and 4min
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 36min).
Average sunshine days in September
Ilomantsi, Finland
- Average sunshine days in September: 13.6 days
The month with the most sunshine days is May (18 days).
The month with the least sunshine days is December (6.5 days).
Average UV index in September
Ilomantsi, 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, October, November and December (UV index 1).
Average cloud cover in September
Ilomantsi, Finland
- Average cloud cover in September: 65
The months with the most cloud cover are February and December (Cloud cover 86).
The month with the least cloud cover is July (Cloud cover 45).
Average visibility in September
Ilomantsi, Finland
- Average visibility in September: 7km
The months with the highest visibility are May, June and July (9km).
The months with the lowest visibility are January, February and March (5km).
