September weather forecastRauma, Finland
September
Weather in September
Rauma slides towards autumn in September, which is characterized by a gentle dip in temperatures. With the changing seasons, total rainfall jumps to 43mm (1.69"), nurturing the transition into a palette of dazzling fall colours. Daylight hours continue to shrink, dipping to an average of 12.9 hours. Cooler temperatures also usher in an increase in average wind speed to 16.8km/h (10.4mph). Longer nights make September a suitable time for stargazing while walking in the cool outdoor breezes.Temperature
The average high-temperature in Rauma shows a slight dip in September, from August's enjoyable 19.1°C (66.4°F) to a mild 14.8°C (58.6°F). Rauma's average temperature during the nights of September is recorded at a cool 10.8°C (51.4°F).Humidity
In Rauma, the average relative humidity in September is 79%.Rainfall
In Rauma, Finland, in September, it is raining for 14 days, with typically 43mm (1.69") of accumulated precipitation. Throughout the year, there are 135.2 rainfall days, and 422mm (16.61") of precipitation is accumulated.Snowfall
In Rauma, Finland, snow does not fall in June through September.Daylight
In September, the average length of the day in Rauma, Finland, is 12h and 54min.On the first day of September in Rauma, sunrise is at 06:27 and sunset at 20:40. On the last day of the month, sunrise is at 07:39 and sunset at 19:08 EEST.
Sunshine
The average sunshine in September is 7.6h.UV index
In Rauma, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: During September, 3 as the daily maximum UV index converts into the following advice:
Put precautions into practice - Protective measures against sun-induced damage are advised. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Rauma, Finland
- Average high temperature in September: 14.8°C
The warmest month (with the highest average high temperature) is July (19.7°C).
The months with the lowest average high temperature are January and February (-1.5°C).
- Average low temperature in September: 10.8°C
The month with the highest average low temperature is August (14°C).
The coldest month (with the lowest average low temperature) is February (-5°C).
Average pressure in September
Rauma, Finland
- Average pressure in September: 1012.8mbar
The month with the highest atmospheric pressure is May (1014.8mbar).
The month with the lowest atmospheric pressure is December (1006.9mbar).
Average wind speed in September
Rauma, Finland
- Average wind speed in September: 16.8km/h
The windiest month (with the highest average wind speed) is December (20.7km/h).
The calmest month (with the lowest average wind speed) is July (14.5km/h).
Average humidity in September
Rauma, 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 (71%).
Average rainfall in September
Rauma, Finland
- Average rainfall in September: 43mm
The wettest month (with the highest rainfall) is July (56mm).
The driest month (with the least rainfall) is April (21mm).
Average rainfall days in September
Rauma, Finland
- Average rainfall days in September: 14 days
The month with the highest number of rainy days is July (15.8 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in September
Rauma, Finland
- Average snowfall in September: 0mm
The month with the highest snowfall is March (88mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Rauma, Finland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is March (13 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Rauma, Finland
- Average daylight in September: 12h and 54min
The month with the longest days is June (Average daylight: 19h and 12min).
The month with the shortest days is December (Average daylight: 5h and 42min).
- Average sunshine in September: 7h and 36min
The month with the most sunshine is June (Average sunshine: 12h and 18min).
The months with the least sunshine are January and December (Average sunshine: 2h and 6min).
Average sunshine days in September
Rauma, Finland
- Average sunshine days in September: 13.5 days
The month with the most sunshine days is June (16.8 days).
The month with the least sunshine days is December (10.7 days).
Average UV index in September
Rauma, 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 and December (UV index 1).
Average cloud cover in September
Rauma, Finland
- Average cloud cover in September: 45
The month with the most cloud cover is January (Cloud cover 71).
The months with the least cloud cover are July and August (Cloud cover 36).
Average visibility in September
Rauma, Finland
- Average visibility in September: 10km
The months with the highest visibility are May, June, July, August and September (10km).
The months with the lowest visibility are January, February and March (8km).
