September weather forecastMäntsälä, Finland
September
Weather in September
The first month of the autumn, September, is still a mild month in Mäntsälä, Finland, with an average temperature ranging between max 15.1°C (59.2°F) and min 8.2°C (46.8°F).Temperature
Mäntsälä experiences a temperature shift at the start of September, with average high-temperatures adjusting from an agreeable 20.8°C (69.4°F) in August to a mild 15.1°C (59.2°F). During the nights in September, Mäntsälä experiences a consistent average temperature of 8.2°C (46.8°F).Humidity
In September, the average relative humidity is 83%.Rainfall
August and September are months with the least rain when the rain falls for 9.7 days and typically aggregates up to 18mm (0.71") of rain.Snowfall
In Mäntsälä, snow does not fall in June through September.Daylight
In Mäntsälä, the average length of the day in September is 12h and 53min.On the first day of the month, sunrise is at 06:13 and sunset at 20:23. On the last day of September, sunrise is at 07:23 and sunset at 18:53 EEST.
Sunshine
In September, the average sunshine is 7h.UV index
In Mäntsälä, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: A maximum daily UV index of 3 during September morphs into the following directions:
Take necessary precautions - Protection from skin and eye injury is mandatory. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mäntsälä, Finland
- Average high temperature in September: 15.1°C
The warmest month (with the highest average high temperature) is July (22.2°C).
The month with the lowest average high temperature is January (-3.8°C).
- Average low temperature in September: 8.2°C
The month with the highest average low temperature is July (12.4°C).
The coldest month (with the lowest average low temperature) is January (-8.3°C).
Average pressure in September
Mäntsälä, 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 (1008.3mbar).
Average wind speed in September
Mäntsälä, Finland
- Average wind speed in September: 9.8km/h
The windiest month (with the highest average wind speed) is December (11.4km/h).
The calmest month (with the lowest average wind speed) is August (9.1km/h).
Average humidity in September
Mäntsälä, Finland
- Average humidity in September: 83%
The month with the highest relative humidity is February (95%).
The month with the lowest relative humidity is May (67%).
Average rainfall in September
Mäntsälä, Finland
- Average rainfall in September: 18mm
The wettest month (with the highest rainfall) is December (44mm).
The driest months (with the least rainfall) are August and September (18mm).
Average rainfall days in September
Mäntsälä, Finland
- Average rainfall days in September: 9.7 days
The month with the highest number of rainy days is November (13.5 days).
The month with the least rainy days is February (4.2 days).
Average snowfall in September
Mäntsälä, Finland
- Average snowfall in September: 0mm
The month with the highest snowfall is February (229mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Mäntsälä, Finland
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (22.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Mäntsälä, Finland
- Average daylight in September: 12h and 54min
The month with the longest days is June (Average daylight: 19h and 0min).
The month with the shortest days is December (Average daylight: 5h and 48min).
- Average sunshine in September: 7h and 0min
The month with the most sunshine is June (Average sunshine: 11h and 42min).
The month with the least sunshine is December (Average sunshine: 1h and 42min).
Average sunshine days in September
Mäntsälä, Finland
- Average sunshine days in September: 18.2 days
The month with the most sunshine days is June (20.8 days).
The month with the least sunshine days is February (6.5 days).
Average UV index in September
Mäntsälä, 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
Mäntsälä, Finland
- Average cloud cover in September: 55
The months with the most cloud cover are January and February (Cloud cover 78).
The month with the least cloud cover is August (Cloud cover 42).
Average visibility in September
Mäntsälä, Finland
- Average visibility in September: 8km
The months with the highest visibility are May, June and July (9km).
The months with the lowest visibility are January and February (5km).
