Weather in Kemi in September 2025
Average weather
Average temperature in Kemi in September
Going from a maximum of +17°C during the day to a minimum of +2°C during the night, the temperature in September averages around +14°C.
The average maximum temperature goes down 27% by the end of the month, compared with the beginning of the month, from +16°C to +12°C.
Is Kemi warm or cold in September?
Kemi is typically mild in September.
Maximum temperatures go down compared to the previous month from +16°C to +12°C. The minimum temperature also goes down from +11°C to +7°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Kemi:
Climate in Kemi in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +16°C | +12°C | +5°C | ||||
| Min. temperature | ||||||
| -1°C | -6°C | -17°C | ||||
| Max. temperature | ||||||
| +28°C | +22°C | +16°C | ||||
| Rainfall | ||||||
| 80 mm | 69 mm | 55 mm | ||||
| Wind | ||||||
| 3 m/s | 4 m/s | 4 m/s | ||||
| Humidity | ||||||
| 79% | 82% | 86% | ||||
| Air pressure | ||||||
| 1010 HPa | 1010 HPa | 1008 HPa | ||||
| Sunny days | ||||||
| 5 | 3 | 3 | ||||
| Cloudy days | ||||||
| 9 | 11 | 11 | ||||
| Rainy days | ||||||
| 17 | 16 | 12 | ||||
| Snowy days | ||||||
| 0 | 0 | 5 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +16°C in the day, the average maximum temperature lowers to +12°C. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 80 mm to 69 mm. Humidity rises from 79% to 82%. Winds are stronger in comparison to August, going up from 3 m/s to 4 m/s on average. The days becoming less sunny, going from 5 sunny days in August to 3 in September.
Next month (October) brings a further decline in the weather.
Wind
The average wind speed is 4 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Kemi is gradually decreasing during September, going from 3 m/s to 2 m/s over the course of the month.
Rain
How was the weather last September in Kemi?
Climate Change over Years
The climate in Kemi in September has not changed much over the last 43 years.
The average temperature was the lowest in 1985 (+2°C) and the highest in 2020 (+8°C). The driest year was 2002 with only 248 mm of rainfall, and the wettest year was 2020 with 612 mm.
FAQ
Is September a good time to visit Kemi?
Can you sunbathe in Kemi in September?
Is Kemi rainy in September?
Is it sunny in Kemi in September?
Other cities in Finland
Monthly weather in Kemi
Source of the data
For this page, we’ve looked at the typical weather in Kemi, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.