September weather forecastRognan, Norway

September

Weather in September

The first month of the autumn, September, is also a frosty month in Rognan, Norway, with temperature in the range of an average high of 8.4°C (47.1°F) and an average low of 2.7°C (36.9°F).

Temperature

Rognan's September weather features a light decline in high-temperatures, reducing from a moderate 13.1°C (55.6°F) in August to a frosty 8.4°C (47.1°F). September's nights observe an average temperature of 2.7°C (36.9°F).

Humidity

The average relative humidity in September in Rognan is 85%.

Rainfall

In September, the rain falls for 19.2 days. Throughout September, 56mm (2.2") of precipitation is accumulated. In Rognan, during the entire year, the rain falls for 188.6 days and collects up to 807mm (31.77") of precipitation.

Snowfall

Months with snowfall in Rognan are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 0.7 snowfall days, it receives 6mm (0.24") of snow. Throughout the year, there are 130.4 snowfall days, and 2323mm (91.46") of snow is accumulated.

Sea temperature

In Rognan, the average seawater temperature in September is 11.4°C (52.5°F).
Note: Dipping into 11.4°C (52.5°F) below 10°C (50°F) is possible with the right protection; absent that, anticipate cold shock and hampered breathing. Swimming momentarily at 13°C (55.4°F) can be jarring.

Daylight

In September, the average length of the day is 13h and 10min.
On the first day of the month, sunrise is at 05:31 and sunset at 20:25. On the last day of September, sunrise is at 07:08 and sunset at 18:27 CEST.

Sunshine

In Rognan, Norway, the average sunshine in September is 6.3h.

UV index

February through April, September through December, with an average maximum UV index of 1, are months with the lowest UV index in Rognan. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: The UV index of 1 during September leads to these advisories:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.

Updated: Jan 26, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In September, in Rognan, the average high-temperature is 8.4°C (47.1°F), and the average low-temperature is 2.7°C (36.9°F).

In September, the average relative humidity in Rognan, Norway, is 85%.

In Rognan, Norway, in September, during 19.2 rainfall days, 56mm (2.2") of precipitation is typically accumulated.

September is the first month it typically snows. Throughout September, in the average 0.7 snowfall days, it receives 6mm (0.24") of snow.

In Rognan, Norway, the average seawater temperature in September is 11.4°C (52.5°F). Swimming in 11.4°C (52.5°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

In Rognan, the average day length in September is 13h and 10min.

In September, on the first day of the month, sunrise is at 05:31 and sunset at 20:25. On the last day of the month, in Rognan, sunrise is at 07:08 and sunset at 18:27 CEST.

In Rognan, Norway, the average sunshine duration in September is 6.3h.

February through April, September through December, with an average maximum UV index of 1, are months with the lowest UV index.

In September, the average daily maximum UV index in Rognan is 1. A UV Index value of 2, and less, symbolizes a low health risk from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year J F M A M J J A September O N D

Aug

September

Oct

Average high temperature

13.1°C

8.4°C

0.7°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

10.8km/h

12km/h

13km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

0.7

8.1

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

9.3

7.8

Average UV index

Average cloud cover

Average visibility

Average temperature in September
Rognan, Norway

Average high temperature in September: 8.4°C

The warmest month (with the highest average high temperature) is July (14.4°C).
The month with the lowest average high temperature is January (-7.8°C).

Average low temperature in September: 2.7°C

The month with the highest average low temperature is July (7.3°C).
The coldest month (with the lowest average low temperature) is January (-13.3°C).

Average pressure in September
Rognan, Norway

Average pressure in September: 1009.9mbar

The month with the highest atmospheric pressure is May (1014.4mbar).
The month with the lowest atmospheric pressure is December (1002.9mbar).

Average wind speed in September
Rognan, Norway

Average wind speed in September: 11.5km/h

The windiest month (with the highest average wind speed) is January (15km/h).
The calmest month (with the lowest average wind speed) is August (9.9km/h).

Average humidity in September
Rognan, Norway

Average humidity in September: 85%

The month with the highest relative humidity is April (93%).
The month with the lowest relative humidity is July (77%).

Average rainfall in September
Rognan, Norway

Average rainfall in September: 56mm

The wettest month (with the highest rainfall) is March (99mm).
The driest month (with the least rainfall) is August (50mm).

Average rainfall days in September
Rognan, Norway

Average rainfall days in September: 19.2 days

The month with the highest number of rainy days is June (19.8 days).
The month with the least rainy days is January (10.4 days).

Average snowfall in September
Rognan, Norway

Average snowfall in September: 6mm

The month with the highest snowfall is March (472mm).
The months with the least snowfall are July and August (0mm).

Average snowfall days in September
Rognan, Norway

Average snowfall days in September: 0.7 days

The month with the highest number of snowfall days is March (22.9 days).
The months with the least snowfall days are July and August (0 days).

Average sea temperature in September
Rognan, Norway

Average sea temperature in September: 11.4°C

The best month for swimming (with the highest average sea temperature) is July (13.5°C).
The coldest month (with the lowest average sea temperature) is March (3.3°C).

Average daylight in September /
Average sunshine in September
Rognan, Norway

Average daylight in September: 13h and 12min

The month with the longest days is May (Average daylight: 20h and 6min).
The month with the shortest days is June (Average daylight: 0h and 0min).

Average sunshine in September: 6h and 18min

The month with the most sunshine is August (Average sunshine: 8h and 30min).
The month with the least sunshine is June (Average sunshine: 1h and 0min).

Average sunshine days in September
Rognan, Norway

Average sunshine days in September: 7.8 days

The month with the most sunshine days is August (9.3 days).
The month with the least sunshine days is March (5.5 days).

Average UV index in September
Rognan, Norway

Average UV index in September: 1

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