Ísafjörður
Iceland
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Ísafjörður, Iceland

September, the first month of the autumn, in Ísafjörður, is also a frosty month, with average temperature ranging between max 9°C (48.2°F) and min 4.5°C (40.1°F).

Temperature

In September, the average high-temperature is essentially the same as in August - a frosty 9°C (48.2°F). In September, the average low-temperature is 4.5°C (40.1°F).

Rainfall

In Ísafjörður, 84mm (3.3") of precipitation is typically accumulated. During the entire year, Ísafjörður aggregates up to 997mm (39.3") of precipitation.

Sea temperature

In September, the average sea temperature in Ísafjörður is 7.4°C (45.3°F).
Note: Swimming in 7.4°C (45.3°F) is considered dangerous. Unprotected immersion in temperatures below 10°C (50°F) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

In Ísafjörður, the average length of the day in September is 13.1h.

What is the temperature in September in Ísafjörður?

The average high-temperature, in September, in Ísafjörður, Iceland, is 9°C (48.2°F), while the average low-temperature is 4.5°C (40.1°F).

How much does it rain in Ísafjörður in September?

During September, Ísafjörður regularly aggregates up to 84mm (3.3") of precipitation.

What is the water temperature in September in Ísafjörður?

In Ísafjörður, Iceland, the average seawater temperature in September is 7.4°C (45.3°F). Swimming in 7.4°C (45.3°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.

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

The average length of the day in September in Ísafjörður, Iceland, is 13.1h.
Average temperature in September - Ísafjörður, Iceland
  • Average high temperature in September: 9°C

The warmest month (with the highest average high temperature) is July (12.3°C).
The month with the lowest average high temperature is January (1.3°C).

  • Average low temperature in September: 4.5°C

The month with the highest average low temperature is July (7.1°C).
The coldest month (with the lowest average low temperature) is January (-4°C).

Average rainfall in September - Ísafjörður, Iceland
  • Average rainfall in September: 84mm

The wettest month (with the highest rainfall) is October (122mm).
The driest month (with the lowest rainfall) is July (55mm).

Average sea temperature in September - Ísafjörður, Iceland
  • Average sea temperature in September: 7.4°C

The best month for swimming (with the highest average sea temperature) is July (8.7°C).
The coldest month (with the lowest average sea temperature) is March (2.7°C).

Average daylight in September - Ísafjörður, Iceland
  • Average daylight in September: 13.1h

The month with the longest days is June (Average daylight: 23.5h).
The month with shortest days is December (Average daylight: 3.1h).