September weather forecastJomala, Finland
September
Weather in September
The first month of the autumn, September, is still a mild month in Jomala, Finland, with an average temperature ranging between min 12.7°C (54.9°F) and max 14.5°C (58.1°F).Temperature
Jomala, Finland, observes a small decrease in the average high-temperature with the arrival of September, falling from August's enjoyable 17.6°C (63.7°F) to a mild 14.5°C (58.1°F). Throughout the nights in September, Jomala notes an average low of 12.7°C (54.9°F), a small dip from the daytime peak.Humidity
In Jomala, the average relative humidity in September is 79%.Rainfall
In Jomala, in September, during 12.5 rainfall days, 28mm (1.1") of precipitation is typically accumulated. In Jomala, during the entire year, the rain falls for 116.3 days and collects up to 274mm (10.79") of precipitation.Snowfall
June through September are months without snowfall.Daylight
In Jomala, the average length of the day in September is 12h and 52min.On the first day of September, sunrise is at 06:36 and sunset at 20:43. On the last day of the month, sunrise is at 07:44 and sunset at 19:15 EEST.
Sunshine
In September, the average sunshine is 7.8h.UV index
In Jomala, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Make use of precautions - Suggestions to resist sunburn are communicated. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Jomala, Finland
- Average high temperature in September: 14.5°C
The warmest month (with the highest average high temperature) is August (17.6°C).
The month with the lowest average high temperature is February (0.5°C).
- Average low temperature in September: 12.7°C
The month with the highest average low temperature is August (15.9°C).
The coldest month (with the lowest average low temperature) is February (-1.5°C).
Average pressure in September
Jomala, Finland
- Average pressure in September: 1013.1mbar
The month with the highest atmospheric pressure is May (1014.9mbar).
The month with the lowest atmospheric pressure is December (1007.4mbar).
Average wind speed in September
Jomala, Finland
- Average wind speed in September: 25.1km/h
The windiest month (with the highest average wind speed) is December (31.7km/h).
The calmest month (with the lowest average wind speed) is July (20km/h).
Average humidity in September
Jomala, Finland
- Average humidity in September: 79%
The month with the highest relative humidity is February (84%).
The months with the lowest relative humidity are August and October (78%).
Average rainfall in September
Jomala, Finland
- Average rainfall in September: 28mm
The wettest month (with the highest rainfall) is October (32mm).
The driest month (with the least rainfall) is April (11mm).
Average rainfall days in September
Jomala, Finland
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is August (14.2 days).
The month with the least rainy days is February (3.8 days).
Average snowfall in September
Jomala, Finland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (44mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Jomala, Finland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Jomala, Finland
- Average daylight in September: 12h and 54min
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 48min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 2h and 12min).
Average sunshine days in September
Jomala, Finland
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is May (20.5 days).
The month with the least sunshine days is December (11.1 days).
Average UV index in September
Jomala, Finland
- Average UV index in September: 4
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February and March (UV index 1).
Average cloud cover in September
Jomala, Finland
- Average cloud cover in September: 43
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 35).
Average visibility in September
Jomala, Finland
- Average visibility in September: 10km
The months with the highest visibility are April, May, June, July, August, September and October (10km).
The months with the lowest visibility are January, February, March, November and December (9km).
