September weather forecast
Nellim, Finland

September

Weather in September

Nellim's September weather carries strong characteristics of autumn, with a further dip in temperature. The vibrancy of the city's natural surroundings is enhanced by the beautiful autumn colours. The weather patterns gradually change with shorter daylight hours, reduced rainfall, and the return of snowfall. September marks the return of snowfall with an average volume of 9mm (0.35"), albeit much lower compared to the heavy snow season.

Temperature

Nellim's weather subtly changes with the onset of September, barely falling from a refreshing 15°C (59°F) in August to a fresh 10.3°C (50.5°F). Nighttime temperatures hover around an average low of 5.3°C (41.5°F) in September.

Humidity

In Nellim, the average relative humidity in September is 83%.

Rainfall

In September, the rain falls for 14.3 days. Throughout September, 34mm (1.34") of precipitation is accumulated. Throughout the year, there are 115.3 rainfall days, and 395mm (15.55") of precipitation is accumulated.

Snowfall

Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 1.6 snowfall days, it receives 9mm (0.35") of snow. Throughout the year, there are 130.8 snowfall days, and 1094mm (43.07") of snow is accumulated.

Daylight

The average length of the day in September is 13h and 17min.
On the first day of September, sunrise is at 05:30 and sunset at 20:42. On the last day of the month, sunrise is at 07:18 and sunset at 18:34 EEST.

Sunshine

In Nellim, the average sunshine in September is 5.7h.

UV index

In Nellim, the average daily maximum UV index in September is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum daily UV index, 2 in September, converts into the following recommendations:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.

Frequently asked questions

What are the temperatures in September?
In September, in Nellim, the average high-temperature is 10.3°C (50.5°F), and the average low-temperature is 5.3°C (41.5°F).
What is the average humidity in September?
In September, the average relative humidity in Nellim is 83%.
How many days does it rain in September?
In Nellim, during September, the rain falls for 14.3 days and regularly aggregates up to 34mm (1.34") of precipitation.
When does it start to snow?
September is the first month it typically snows. Throughout September, in the average 1.6 snowfall days, it receives 9mm (0.35") of snow.
What is the average length of the day in September?
The average day length in September is 13h and 17min.
What time are sunrise and sunset in September?
In September, on the first day of the month, sunrise is at 05:30 and sunset at 20:42. On the last day of the month, sunrise is at 07:18 and sunset at 18:34 EEST.
How long on average sun shines in September?
The average sunshine duration in September is 5.7h.
What is the UV index intensity in September?
In September, the average daily maximum UV index in Nellim is 2. A UV Index estimate of 2, and below, represents a low health risk from exposure to Sun's UV rays.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility
Average temperature in September
Nellim, Finland
  • Average high temperature in September: 10.3°C

The warmest month (with the highest average high temperature) is July (17.3°C).
The month with the lowest average high temperature is January (-8.5°C).

  • Average low temperature in September: 5.3°C

The month with the highest average low temperature is July (10.3°C).
The coldest month (with the lowest average low temperature) is January (-14°C).

Average pressure in September
Nellim, Finland
  • Average pressure in September: 1010.6mbar

The month with the highest atmospheric pressure is May (1014.6mbar).
The month with the lowest atmospheric pressure is December (1004.2mbar).

Average wind speed in September
Nellim, Finland
  • Average wind speed in September: 14.7km/h

The windiest month (with the highest average wind speed) is March (16.2km/h).
The calmest month (with the lowest average wind speed) is August (12.6km/h).

Average humidity in September
Nellim, Finland
  • Average humidity in September: 83%

The month with the highest relative humidity is January (94%).
The month with the lowest relative humidity is June (67%).

Average rainfall in September
Nellim, Finland
  • Average rainfall in September: 34mm

The wettest months (with the highest rainfall) are June and July (48mm).
The driest month (with the least rainfall) is February (21mm).

Average rainfall days in September
Nellim, Finland
  • Average rainfall days in September: 14.3 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is February (1.9 days).

Average snowfall in September
Nellim, Finland
  • Average snowfall in September: 9mm

The month with the highest snowfall is January (166mm).
The months with the least snowfall are July and August (0mm).

Average snowfall days in September
Nellim, Finland
  • Average snowfall days in September: 1.6 days

The month with the highest number of snowfall days is December (20.2 days).
The month with the least snowfall days is July (0 days).

Average daylight in September /
Average sunshine in September
Nellim, Finland
  • Average daylight in September: 13h and 2min

The month with the longest days is August (Average daylight: 17h and 42min).
The month with the shortest days is June (Average daylight: 0h and 0min).

  • Average sunshine in September: 5h and 4min

The month with the most sunshine is August (Average sunshine: 7h and 54min).
The month with the least sunshine is December (Average sunshine: 0h and 18min).

Average sunshine days in September
Nellim, Finland
  • Average sunshine days in September: 11.7 days

The month with the most sunshine days is January (13.8 days).
The month with the least sunshine days is April (8.1 days).

Average UV index in September
Nellim, Finland
  • Average UV index in September: 2

The months with the highest UV index are June and July (UV index 4).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 1).

Average cloud cover in September
Nellim, Finland
  • Average cloud cover in September: 62

The month with the most cloud cover is January (Cloud cover 76).
The month with the least cloud cover is July (Cloud cover 56).

Average visibility in September
Nellim, Finland
  • Average visibility in September: 9km

The month with the highest visibility is June (10km).
The months with the lowest visibility are January, February, April and December (7km).

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