September weather forecastMikkeli, Finland
September
Weather in September
September brings forth the clear arrival of autumn in Mikkeli. The month starts with mild weather conditions, which gradually cool down as it progresses. Leaves start to change their color, presenting a landscape that is rich in autumn hues. Despite having less sunshine hours than August, September still enjoys pleasantly warm afternoons. As the days shorten and nights grow longer, the Finnish sauna culture begins to take center stage in Mikkeli's social scene.Temperature
The beginning of September in Mikkeli marks a decrease in the average high-temperature, transitioning from a pleasant 20.4°C (68.7°F) in August to a moderate 14.3°C (57.7°F). September nights in Mikkeli are marked by an average low-temperature of 8°C (46.4°F).Humidity
In Mikkeli, the average relative humidity in September is 82%.Rainfall
In Mikkeli, in September, during 14.2 rainfall days, 35mm (1.38") of precipitation is typically accumulated. Throughout the year, in Mikkeli, there are 125 rainfall days, and 408mm (16.06") of precipitation is accumulated.Snowfall
Months with snowfall in Mikkeli, Finland, are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 1mm (0.04") of snow. Throughout the year, there are 114.6 snowfall days, and 1087mm (42.8") of snow is accumulated.Daylight
In September, the average length of the day in Mikkeli is 12h and 55min.On the first day of the month, sunrise is at 06:02 and sunset at 20:18. On the last day of September, in Mikkeli, sunrise is at 07:16 and sunset at 18:45 EEST.
Sunshine
The average sunshine in September is 6.7h.UV index
The average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum UV index of 3 in September translates into the following recommendations:
Make use of precautions - Suggestions to resist sunburn are communicated. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mikkeli, Finland
- Average high temperature in September: 14.3°C
The warmest month (with the highest average high temperature) is July (21.9°C).
The month with the lowest average high temperature is January (-5.3°C).
- Average low temperature in September: 8°C
The month with the highest average low temperature is July (12.6°C).
The coldest month (with the lowest average low temperature) is January (-9.2°C).
Average pressure in September
Mikkeli, Finland
- Average pressure in September: 1013.1mbar
The month with the highest atmospheric pressure is May (1014.7mbar).
The month with the lowest atmospheric pressure is December (1008.5mbar).
Average wind speed in September
Mikkeli, Finland
- Average wind speed in September: 11.1km/h
The windiest month (with the highest average wind speed) is December (12.9km/h).
The calmest months (with the lowest average wind speed) are July and August (10.1km/h).
Average humidity in September
Mikkeli, Finland
- Average humidity in September: 82%
The months with the highest relative humidity are January and February (95%).
The month with the lowest relative humidity is May (66%).
Average rainfall in September
Mikkeli, Finland
- Average rainfall in September: 35mm
The wettest month (with the highest rainfall) is July (44mm).
The driest month (with the least rainfall) is April (25mm).
Average rainfall days in September
Mikkeli, Finland
- Average rainfall days in September: 14.2 days
The month with the highest number of rainy days is July (15.9 days).
The month with the least rainy days is February (2.7 days).
Average snowfall in September
Mikkeli, Finland
- Average snowfall in September: 1mm
The month with the highest snowfall is December (236mm).
The months with the least snowfall are July and August (0mm).
Average snowfall days in September
Mikkeli, Finland
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is January (24.4 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Mikkeli, Finland
- Average daylight in September: 12h and 54min
The month with the longest days is June (Average daylight: 19h and 24min).
The month with the shortest days is December (Average daylight: 5h and 30min).
- Average sunshine in September: 6h and 42min
The month with the most sunshine is June (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 0h and 48min).
Average sunshine days in September
Mikkeli, Finland
- Average sunshine days in September: 13.5 days
The month with the most sunshine days is May (16 days).
The month with the least sunshine days is December (6.5 days).
Average UV index in September
Mikkeli, 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
Mikkeli, Finland
- Average cloud cover in September: 56
The months with the most cloud cover are January and February (Cloud cover 82).
The month with the least cloud cover is July (Cloud cover 42).
Average visibility in September
Mikkeli, 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).
