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
Onset of September comes with a temperature decline, the average high falling from a pleasant 20.1°C (68.2°F) in August to a moderate 15°C (59°F). An average low-temperature of 8.5°C (47.3°F) is expected during September.Humidity
In September, the average relative humidity is 83%.Rainfall
In September, in Pertteli, the rain falls for 12.6 days. Throughout September, 23mm (0.91") of precipitation is accumulated. In Pertteli, during the entire year, the rain falls for 122 days and collects up to 276mm (10.87") of precipitation.Snowfall
In Pertteli, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 53min.On the first day of the month, sunrise is at 06:22 and sunset at 20:31. On the last day of September, in Pertteli, sunrise is at 07:31 and sunset at 19:02 EEST.
Sunshine
In Pertteli, the average sunshine in September is 7.4h.UV index
In September, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the ordinary person.Note: The UV index of 3 during September leads to these advisories:
Preventative actions are necessary - Recommendations to ward off sunburn are given. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Pertteli in September?
What is the average humidity in September in Pertteli?
How much does it rain in Pertteli in September?
When it does not snow in Pertteli?
Does it snow in Pertteli in September?
How many hours of daylight does Pertteli have in September?
What time are sunrise and sunset in September in Pertteli?
How long on average sun shines in September in Pertteli?
What is the UV index intensity in September in Pertteli?
Average temperature in September
Pertteli, Finland
- Average high temperature in September: 15°C
The warmest month (with the highest average high temperature) is July (21.2°C).
The month with the lowest average high temperature is January (-3.2°C).
- Average low temperature in September: 8.5°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 (-7.3°C).
Average pressure in September
Pertteli, 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 (1008.1mbar).
Average wind speed in September
Pertteli, Finland
- Average wind speed in September: 12km/h
The windiest month (with the highest average wind speed) is December (15.2km/h).
The calmest month (with the lowest average wind speed) is August (11km/h).
Average humidity in September
Pertteli, Finland
- Average humidity in September: 83%
The months with the highest relative humidity are January and February (93%).
The month with the lowest relative humidity is May (70%).
Average rainfall in September
Pertteli, Finland
- Average rainfall in September: 23mm
The wettest month (with the highest rainfall) is July (35mm).
The driest month (with the least rainfall) is April (14mm).
Average rainfall days in September
Pertteli, Finland
- Average rainfall days in September: 12.6 days
The month with the highest number of rainy days is July (15.9 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in September
Pertteli, Finland
- Average snowfall in September: 0mm
The month with the highest snowfall is December (91mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Pertteli, Finland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (15.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Pertteli, Finland
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 18h and 54min).
The month with the shortest days is December (Average daylight: 5h and 54min).
- Average sunshine in September: 7h and 2min
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 48min).
Average sunshine days in September
Pertteli, Finland
- Average sunshine days in September: 14 days
The month with the most sunshine days is May (16.8 days).
The month with the least sunshine days is December (10.4 days).
Average UV index in September
Pertteli, 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
Pertteli, Finland
- Average cloud cover in September: 48
The months with the most cloud cover are February and December (Cloud cover 74).
The month with the least cloud cover is August (Cloud cover 38).
Average visibility in September
Pertteli, 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 (7km).
