September weather forecastAskøy, Norway

September

Weather in September

Askøy in September witnesses a change in weather as the city moves from late summer into early autumn. Average high temperatures drop from 16.1°C (61°F) to 14°C (57.2°F) compared to August. Notably, September receives up to 150mm (5.91") of rainfall, a gentle increase from August. As autumn sets in, the days begin to shorten, and the city sees earlier sunsets. This month signifies the onset of the picturesque autumnal season.

Temperature

At the onset of September, Askøy records an average high-temperature of a moderate 14°C (57.2°F), showing little deviation from the preceding month. Askøy sees a minor drop to an average minimum temperature of 11.1°C (52°F) during the night in the month of September.

Humidity

The average relative humidity in September is 79%.

Rainfall

In Askøy, Norway, during September, the rain falls for 21.7 days and regularly aggregates up to 150mm (5.91") of precipitation. Throughout the year, in Askøy, there are 226.5 rainfall days, and 1565mm (61.61") of precipitation is accumulated.

Snowfall

June through September are months without snowfall in Askøy, Norway.

Sea temperature

In September, the average sea temperature is 14.7°C (58.5°F).
Note: Diving into 14.7°C (58.5°F) is practical below 10°C (50°F), given you're wearing protective swim gear; without it, expect a quick onset of cold shock and a struggle to breathe. Merely touching waters at 13°C (55.4°F) feels ice-cold.

Daylight

In September, the average length of the day is 12h and 53min.
On the first day of the month, sunrise is at 06:34 and sunset at 20:43. On the last day of September, in Askøy, sunrise is at 07:44 and sunset at 19:14 CEST.

Sunshine

The average sunshine in September in Askøy, Norway, is 6.1h.

UV index

In September, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.
Note: A daily maximum UV index of 3 in September translates into the following instructions:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days.

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

Frequently asked questions

The average high-temperature and low-temperature during September are 14°C (57.2°F) and 11.1°C (52°F) respectively.

In September, the average relative humidity is 79%.

In Askøy, in September, during 21.7 rainfall days, 150mm (5.91") of precipitation is typically accumulated.

In Askøy, snow does not fall in June through September.

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

In Askøy, Norway, the average seawater temperature in September is 14.7°C (58.5°F). At temperatures below 10°C (50°F), 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 (55.4°F) is not comfortable.

In September, the average day length in Askøy is 12h and 53min.

On the first day of September in Askøy, sunrise is at 06:34 and sunset at 20:43. On the last day of the month, sunrise is at 07:44 and sunset at 19:14 CEST.

In September, the average sunshine duration in Askøy is 6.1h.

In September, the average daily maximum UV index in Askøy is 3. A UV Index reading of 3 to 5 represents a medium health risk from unsafe 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

16.1°C

14°C

10.1°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

15.3km/h

17.1km/h

19.2km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

0.4

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

6.7

7.8

Average UV index

Average cloud cover

52%

57%

Average visibility

9km

Average temperature in September
Askøy, Norway

Average high temperature in September: 14°C

The warmest month (with the highest average high temperature) is August (16.1°C).
The month with the lowest average high temperature is January (2.8°C).

Average low temperature in September: 11.1°C

The month with the highest average low temperature is August (12.7°C).
The coldest month (with the lowest average low temperature) is February (0°C).

Average pressure in September
Askøy, Norway

Average pressure in September: 1012mbar

The month with the highest atmospheric pressure is May (1014.9mbar).
The month with the lowest atmospheric pressure is December (1005.8mbar).

Average wind speed in September
Askøy, Norway

Average wind speed in September: 16.4km/h

The windiest months (with the highest average wind speed) are January and December (21.1km/h).
The calmest month (with the lowest average wind speed) is June (13.6km/h).

Average humidity in September
Askøy, Norway

Average humidity in September: 79%

The month with the highest relative humidity is March (81%).
The months with the lowest relative humidity are May and October (75%).

Average rainfall in September
Askøy, Norway

Average rainfall in September: 150mm

The wettest month (with the highest rainfall) is October (201mm).
The driest month (with the least rainfall) is April (73mm).

Average rainfall days in September
Askøy, Norway

Average rainfall days in September: 21.7 days

The month with the highest number of rainy days is August (22.2 days).
The month with the least rainy days is February (14.8 days).

Average snowfall in September
Askøy, Norway

Average snowfall in September: 0mm

The month with the highest snowfall is January (127mm).
The months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in September
Askøy, Norway

Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (8.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average sea temperature in September
Askøy, Norway

Average sea temperature in September: 14.7°C

The best month for swimming (with the highest average sea temperature) is August (15.7°C).
The coldest month (with the lowest average sea temperature) is March (4.8°C).

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

Average daylight in September: 12h and 54min

The month with the longest days is June (Average daylight: 18h and 54min).
The month with the shortest days is December (Average daylight: 5h and 54min).

Average sunshine in September: 6h and 6min

The month with the most sunshine is June (Average sunshine: 9h and 48min).
The month with the least sunshine is December (Average sunshine: 2h and 18min).

Average sunshine days in September
Askøy, Norway

Average sunshine days in September: 7 days

The month with the most sunshine days is May (12 days).
The month with the least sunshine days is December (5.4 days).

Average UV index in September
Askøy, Norway

Average UV index in September: 3

The months with the highest UV index are June, July and August (UV index 4).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).

Average cloud cover in September
Askøy, Norway

Average cloud cover in September: 57

The month with the most cloud cover is December (Cloud cover 67).
The month with the least cloud cover is May (Cloud cover 47).

Average visibility in September
Askøy, Norway

Average visibility in September: 9km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).