September weather forecast
Keminmaa, Finland

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Weather in September

September in Keminmaa brings the unmistakable chill of the fall season. The weather becomes comparatively cooler when offset against August's warmer days. With September, the first hints of the approaching winter start to appear, and rainfall continues to be consistent, albeit slightly less than August. Despite the precipitation, September manages to maintain ample daylight hours, comparable to those in October, stretching the mild autumnal afternoons.

Temperature

The onset of September results in a small decrease in the average high-temperature, moderately receding from a refreshing 16.5°C in August to a fresh 12.2°C. Keminmaa registers a subtle dip to an average of 8.4°C during the nights of September.

Humidity

In September, the average relative humidity in Keminmaa is 82%.

Rainfall

In Keminmaa, Finland, in September, it is raining for 14.6 days, with typically 44mm of accumulated precipitation. Throughout the year, in Keminmaa, there are 127 rainfall days, and 472mm of precipitation is accumulated.

Snowfall

In Keminmaa, Finland, snow does not fall in July through September.

Sea temperature

In Keminmaa, in September, the average water temperature is 12.8°C.
Note: With the appropriate swimsuit, one can swim in 12.8°C even if temperatures dip below 10°C; otherwise, be ready for cold shock and breath issues. A fleeting swim around 13°C is distressing.

Daylight

In Keminmaa, the average length of the day in September is 13h and 6min.
On the first day of the month, sunrise is at 05:57 and sunset at 20:46. On the last day of September, in Keminmaa, Finland, sunrise is at 07:28 and sunset at 18:55 EEST.

Sunshine

In September, the average sunshine in Keminmaa is 7.1h.

UV index

In Keminmaa, the average daily maximum UV index in September is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, a regular UV index of 3 translates into these guidelines:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Stay sun-safe with clothing that is both closely woven and worn loosely.
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FAQ

What is the temperature in September in Keminmaa?

The high-temperature, in September, in Keminmaa, is 12.2°C, while the low-temperature averages to 8.4°C.

What is the average humidity in September in Keminmaa?

The average relative humidity in September in Keminmaa is 82%.

How many days does it rain in September in Keminmaa?

In Keminmaa, Finland, during September, the rain falls for 14.6 days and regularly aggregates up to 44mm of precipitation.

When it does not snow in Keminmaa?

In Keminmaa, snow does not fall in July through September.

Does it snow in Keminmaa in September?

In Keminmaa, in September, it doesn't snow. In October, it regularly snows.

What is the sea water temperature in September in Keminmaa?

In Keminmaa, Finland, the average seawater temperature in September is 12.8°C. At temperatures below 10°C, swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C is not comfortable.

What is the average length of the day in September in Keminmaa?

In September, the average day length in Keminmaa, Finland, is 13h and 6min.

What time are sunrise and sunset in September in Keminmaa?

On the first day of September, sunrise is at 05:57 and sunset at 20:46. On the last day of the month, sunrise is at 07:28 and sunset at 18:55 EEST.

How long on average sun shines in September in Keminmaa?

In Keminmaa, Finland, the average sunshine duration in September is 7.1h.

What is the UV index reading in September in Keminmaa?

The average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMJJASeptemberOND
Aug
September
Oct
Average high temperature
16.5°C
12.2°C
5.4°C
Average low temperature
11.8°C
8.4°C
2.4°C
Average pressure
1011.3mbar
1011mbar
1011.3mbar
Average wind speed
14.7km/h
16.5km/h
16.8km/h
Average max. wind speed
15.6km/h
17.1km/h
18km/h
Average wind speed gusts
23.6km/h
25.9km/h
26km/h
Average humidity
77%
82%
84%
Average rainfall
53mm
44mm
37mm
Average rainfall days
15.8
14.6
12.7
Average snowfall
0mm
0mm
33mm
Average snowfall days
0
0
4.2
Average sea temperature
16.1°C
12.8°C
7.6°C
Average daylight
16h 4min
13h 1min
9h 4min
Average sunshine
10h 1min
7h 1min
4h 1min
Average sunshine days
12.9
12.6
13.9
Average UV index
4
3
1
Average cloud cover
41%
52%
56%
Average visibility
10km
9km
9km

Average temperature in September
Keminmaa, Finland

Average temperature in September - Keminmaa, 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).

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Average pressure in September
Keminmaa, Finland

Average pressure in September - Keminmaa, 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).

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Average wind speed in September
Keminmaa, Finland

Average wind speed in September - Keminmaa, 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).

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Average humidity in September
Keminmaa, Finland

Average humidity in September - Keminmaa, 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%).

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Average rainfall in September
Keminmaa, Finland

Average rainfall in September - Keminmaa, 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).

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Average rainfall days in September
Keminmaa, Finland

Average rainfall days in September - Keminmaa, 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).

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Average snowfall in September
Keminmaa, Finland

Average snowfall in September - Keminmaa, 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).

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Average snowfall days in September
Keminmaa, Finland

Average snowfall days in September - Keminmaa, 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).

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Average sea temperature in September
Keminmaa, Finland

Average sea temperature in September - Keminmaa, 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).

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Average daylight in September /
Average sunshine in September
Keminmaa, Finland

Average daylight in September / Average sunshine in September - Keminmaa, Finland
  • Average daylight in September: 13h and 1min

The month with the longest days is July (Average daylight: 20h and 42min).
The month with the shortest days is December (Average daylight: 3h and 18min).

  • Average sunshine in September: 7h and 1min

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).

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Average sunshine days in September
Keminmaa, Finland

Average sunshine days in September - Keminmaa, 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).

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Average UV index in September
Keminmaa, Finland

Average UV index in September - Keminmaa, 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).

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Average cloud cover in September
Keminmaa, Finland

Average cloud cover in September - Keminmaa, 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).

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Average visibility in September
Keminmaa, Finland

Average visibility in September - Keminmaa, 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).

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Keminmaa, Finland

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