September weather forecastKemi, Finland
September
Weather in September
September in Kemi marks the transition from summer to autumn. Moving from August's warmth, the month experiences a noticeable drop in temperatures. Winds strike with an average speed of 16.5km/h (10.3mph), making it the windiest month for the city. The change in season from summer to autumn transforms the city with vibrant color variations seen in foliage across Kemi. The amount of daylight starts to diminish, indicating the forthcoming colder seasons.Temperature
September signifies a gentle decline in Kemi's average high-temperature, easing from an enjoyable 16.5°C (61.7°F) in August to a fresh 12.2°C (54°F). Throughout September nights, Kemi records a consistent low-temperature averaging a frosty 8.4°C (47.1°F).Humidity
In September, the average relative humidity is 82%.Rainfall
In Kemi, Finland, in September, it is raining for 14.6 days, with typically 44mm (1.73") of accumulated precipitation. Throughout the year, there are 127 rainfall days, and 472mm (18.58") of precipitation is accumulated.Snowfall
In Kemi, Finland, snow does not fall in July through September.Sea temperature
In September, the average sea temperature is 12.8°C (55°F).Note: Caution: 12.8°C (55°F) temperatures below 10°C (50°F) during swimming can result in intense cold shock and quickened breathing.
Daylight
The average length of the day in September is 13h and 6min.On the first day of September in Kemi, sunrise is at 05:59 and sunset at 20:43. On the last day of the month, sunrise is at 07:30 and sunset at 18:52 EEST.
Sunshine
In September, the average sunshine in Kemi is 7.1h.UV index
In September, the average daily maximum UV index in Kemi is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: An average UV index of 3 in September transforms into this advice:
Prioritize safety - Recommendations to avert sunburn are shared. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Boost your sun resistance with garments that are densely woven yet spacious.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Kemi, Finland
- Average high temperature in September: 12.2°C
The warmest month (with the highest average high temperature) is July (17.8°C).
The month with the lowest average high temperature is January (-6.3°C).
- Average low temperature in September: 8.4°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 (-10.7°C).
Average pressure in September
Kemi, Finland
- Average pressure in September: 1011mbar
The month with the highest atmospheric pressure is May (1013.9mbar).
The month with the lowest atmospheric pressure is December (1004.9mbar).
Average wind speed in September
Kemi, Finland
- Average wind speed in September: 16.5km/h
The windiest month (with the highest average wind speed) is November (17.7km/h).
The calmest month (with the lowest average wind speed) is April (12.4km/h).
Average humidity in September
Kemi, Finland
- Average humidity in September: 82%
The months with the highest relative humidity are January and February (94%).
The month with the lowest relative humidity is June (71%).
Average rainfall in September
Kemi, Finland
- Average rainfall in September: 44mm
The wettest month (with the highest rainfall) is August (53mm).
The driest month (with the least rainfall) is April (28mm).
Average rainfall days in September
Kemi, Finland
- Average rainfall days in September: 14.6 days
The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in September
Kemi, Finland
- Average snowfall in September: 0mm
The month with the highest snowfall is March (228mm).
The months with the least snowfall are July, August and September (0mm).
Average snowfall days in September
Kemi, Finland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (18.8 days).
The months with the least snowfall days are July, August and September (0 days).
Average sea temperature in September
Kemi, Finland
- Average sea temperature in September: 12.8°C
The best month for swimming (with the highest average sea temperature) is July (16.8°C).
The coldest months (with the lowest average sea temperature) are January and February (-0.7°C).
Average daylight in September /
Average sunshine in September
Kemi, Finland
- Average daylight in September: 13h and 6min
The month with the longest days is July (Average daylight: 20h and 36min).
The month with the shortest days is December (Average daylight: 3h and 24min).
- Average sunshine in September: 7h and 6min
The month with the most sunshine is July (Average sunshine: 12h and 18min).
The month with the least sunshine is December (Average sunshine: 1h and 6min).
Average sunshine days in September
Kemi, Finland
- Average sunshine days in September: 12.6 days
The month with the most sunshine days is October (13.9 days).
The month with the least sunshine days is December (9.9 days).
Average UV index in September
Kemi, 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, March, October and December (UV index 1).
Average cloud cover in September
Kemi, Finland
- Average cloud cover in September: 52
The month with the most cloud cover is January (Cloud cover 73).
The month with the least cloud cover is July (Cloud cover 40).
Average visibility in September
Kemi, Finland
- Average visibility in September: 9km
The months with the highest visibility are June, July and August (10km).
The months with the lowest visibility are January, February, March and April (7km).
