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
The shift from August to September includes a minor decrease in the average high-temperature, lightly dropping from a refreshing 19.6°C (67.3°F) to a moderate 15°C (59°F). In Länsimäki, September nights experience a modest descent in temperature from daily peaks, cooling down to an average of 11°C (51.8°F).Humidity
In September, the average relative humidity is 79%.Rainfall
In September, the rain falls for 13.3 days. Throughout September, 32mm (1.26") of precipitation is accumulated. Throughout the year, in Länsimäki, there are 144.4 rainfall days, and 463mm (18.23") of precipitation is accumulated.Snowfall
In Länsimäki, Finland, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 52min.On the first day of the month, sunrise is at 06:15 and sunset at 20:23. On the last day of September, sunrise is at 07:24 and sunset at 18:54 EEST.
Sunshine
The average sunshine in September in Länsimäki is 7.7h.UV index
In September, the average daily maximum UV index in Länsimäki is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.Note: The average daily UV index of 3 in September transforms into the following instructions:
Put precautions into practice - Protective measures against sun-induced damage are advised. To protect against the Sun's most potent rays, avoid direct exposure around midday. Stay sun-safe with clothing that is both closely woven and worn loosely.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Länsimäki in September?
What is the average humidity in September in Länsimäki?
How many days does it rain in September in Länsimäki?
When it does not snow in Länsimäki?
Does it snow in Länsimäki in September?
How many hours of daylight does Länsimäki have in September?
When are sunrise and sunset in September in Länsimäki?
How long on average sun shines in September in Länsimäki?
How high is the UV index in September in Länsimäki?
Average temperature in September
Länsimäki, Finland
- Average high temperature in September: 15°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
Länsimäki, Finland
- Average pressure in September: 1013.5mbar
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
Länsimäki, Finland
- Average wind speed in September: 16.9km/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
Länsimäki, 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
Länsimäki, 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 (27mm).
Average rainfall days in September
Länsimäki, Finland
- Average rainfall days in September: 13.3 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
Länsimäki, 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
Länsimäki, 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
Länsimäki, Finland
- Average daylight in September: 12h and 5min
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 4min
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 48min).
Average sunshine days in September
Länsimäki, Finland
- Average sunshine days in September: 13.5 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
Länsimäki, 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
Länsimäki, 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
Länsimäki, 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).
