Reykjavík
Iceland
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Reykjavík, Iceland

The city buildings of Reykjavík, the capital city of Iceland, with a view of the sea, and a mountain with a snowy peak in the far distance
The city buildings of Reykjavík, the capital city of Iceland, with a view of the sea, and a mountain with a snowy peak in the far distance
September, the first month of the autumn, in Reykjavík, is also a fresh month, with temperature in the range of an average high of 10.1°C (50.2°F) and an average low of 5°C (41°F).

Temperature

In Reykjavík, Iceland, the average high-temperature in September is relatively the same as in August - a cool 10.1°C (50.2°F). The average low-temperature, in September, is 5°C (41°F).

Rainfall

In September, in Reykjavík, the rain falls for 12.4 days. Throughout September, 66.5mm (2.6") of precipitation is accumulated. In Reykjavík, Iceland, during the entire year, the rain falls for 147.9 days and collects up to 798.2mm (31.4") of precipitation.

Sea temperature

In Reykjavík, in September, the average water temperature is 9.8°C (49.6°F). Swimming in 9.8°C (49.6°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.

Daylight

In Reykjavík, the average length of the day in September is 13h.

Sunshine

The average sunshine in Reykjavík is 4.2h.

UV index

In Reykjavík, Iceland, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to the UV radiation for the average person.
The average daily UV index of 2 in September transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in September in Reykjavík?

In Reykjavík, in September, the average high-temperature is 10.1°C (50.2°F), and the average low-temperature is 5°C (41°F).

How much does it rain in Reykjavík in September?

In Reykjavík, in September, it is raining for 12.4 days, with typically 66.5mm (2.6") of accumulated precipitation.

How cold is the water in September in Reykjavík?

In Reykjavík, Iceland, in September, the average water temperature is 9.8°C (49.6°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.

How many hours of daylight does Reykjavík have in September?

The average length of the day in September is 13h.

How many hours of sunshine does Reykjavík have in September?

In September, the average sunshine in Reykjavík is 4.2h.

How high is the UV index in September in Reykjavík?

The average daily maximum UV index in September in Reykjavík is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in September - Reykjavík, Iceland
  • Average high temperature in September: 10.1°C

The warmest month (with the highest average high temperature) is July (13.3°C).
The month with the lowest average high temperature is January (1.9°C).

  • Average low temperature in September: 5°C

The month with the highest average low temperature is July (8.3°C).
The coldest month (with the lowest average low temperature) is January (-3°C).

Average rainfall in September - Reykjavík, Iceland
  • Average rainfall in September: 66.5mm

The wettest month (with the highest rainfall) is October (85.6mm).
The driest month (with the lowest rainfall) is May (43.8mm).

Average rainfall days in September - Reykjavík, Iceland
  • Average rainfall days in September: 12.4 days

The month with the highest number of rainy days is October (14.5 days).
The month with the lowest number of rainy days is May (9.8 days).

Average sea temperature in September - Reykjavík, Iceland
  • Average sea temperature in September: 9.8°C

The best month for swimming (with the highest average sea temperature) is July (11.4°C).
The coldest month (with the lowest average sea temperature) is March (5.1°C).

Average daylight in September / Average sunshine in September - Reykjavík, Iceland
  • Average daylight in September: 13h

The month with the longest days is June (Average daylight: 20.9h).
The month with shortest days is December (Average daylight: 4.4h).

  • Average sunshine in September: 4.2h

The month with most sunshine is May (Average sunshine: 6.2h).
The month with least sunshine is December (Average sunshine: 0.4h).

Average UV index in September - Reykjavík, Iceland
  • Average UV index in September: 2

Months with the highest UV index are June and July (UV index 4).
Months with the lowest UV index are January, February, November and December (UV index 0).