September weather forecast
Reykjavík, Iceland

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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

Weather in September

Entering fall, the weather in Reykjavík, Iceland starts to cool in September, with an average high of 9.6°C (49.3°F) and the return of snowfall recorded at meager 0mm (0"). With its golden leaves and crisp air, September is high season for photographers and nature lovers. As Reykjavík welcomes autumn, the city undergoes a transformation that unfolds a beautiful palette of fall colors. This is the time when locals gear up for indoor activities while tourists flock to capture the mesmerizing Northern Lights.

Temperature

During the shift to September, Reykjavík records a mild decrease in average high-temperature, moving from a cool 12.8°C (55°F) in August to a frosty 9.6°C (49.3°F). September introduces a small decrease to a nighttime average of 6.2°C (43.2°F) in Reykjavík.

Humidity

The months with the highest humidity are January, February and September, with an average relative humidity of 82%.

Rainfall

In September, in Reykjavík, Iceland, the rain falls for 17.8 days. Throughout September, 40mm (1.57") of precipitation is accumulated. In Reykjavík, during the entire year, the rain falls for 166.2 days and collects up to 416mm (16.38") of precipitation.

Snowfall

June through September are months without snowfall.

Sea temperature

In September, the average sea temperature in Reykjavík is 9.8°C (49.6°F).
Note: Entering waters of 9.8°C (49.6°F) is life-endangering. A mere moment in 13°C (55.4°F) waters feels piercing cold, and below 10°C (50°F) it can lead to immediate cold shock and cessation of breathing control, depending on body resilience.

Daylight

In September, the average length of the day in Reykjavík is 13h and 1min.
On the first day of the month, sunrise is at 06:11 and sunset at 20:42. On the last day of September, sunrise is at 07:35 and sunset at 18:59 GMT.

Sunshine

In September, the average sunshine in Reykjavík is 4.5h.

UV index

In Reykjavík, the average daily maximum UV index in September is 2. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: The UV index of 2 during September translates into the following guidance:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
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Frequently asked questions

What is the usual temperature for Reykjavík in September?

Reykjavík in September has an average high-temperature of 9.6°C (49.3°F) and an average low-temperature of 6.2°C (43.2°F).

What are the most humid months in Reykjavík?

January, February and September, with an average relative humidity of 82%, are most humid months.

What is the average humidity in September in Reykjavík?

In September, the average relative humidity is 82%.

How many days does it rain in September in Reykjavík?

In September, in Reykjavík, the rain falls for 17.8 days. Throughout September, 40mm (1.57") of precipitation is accumulated.

When it does not snow in Reykjavík?

In Reykjavík, Iceland, snow does not fall in June through September.

Does it snow in Reykjavík in September?

In Reykjavík, Iceland, in September, it doesn't snow. In October, it regularly snows.

What is the water temperature in September in Reykjavík?

In Reykjavík, 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 day length in September is 13h and 1min.

What time are sunrise and sunset in September in Reykjavík?

On the first day of September in Reykjavík, Iceland, sunrise is at 06:11 and sunset at 20:42. On the last day of the month, sunrise is at 07:35 and sunset at 18:59 GMT.

How long on average sun shines in September in Reykjavík?

In Reykjavík, Iceland, the average sunshine duration in September is 4.5h.

How high is the UV index in September in Reykjavík?

In September, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a low health threat from unsafe exposure to Sun's UV rays.
Average humidity
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
Reykjavík, Iceland

Average temperature in September - Reykjavík, Iceland
  • Average high temperature in September: 9.6°C

The warmest month (with the highest average high temperature) is July (13.5°C).
The month with the lowest average high temperature is December (1.3°C).

  • Average low temperature in September: 6.2°C

The month with the highest average low temperature is July (9.1°C).
The coldest month (with the lowest average low temperature) is December (-2.4°C).

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Average pressure in September
Reykjavík, Iceland

Average pressure in September - Reykjavík, Iceland
  • Average pressure in September: 1002.9mbar

The month with the highest atmospheric pressure is June (1013.8mbar).
The month with the lowest atmospheric pressure is January (996.6mbar).

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Average wind speed in September
Reykjavík, Iceland

Average wind speed in September - Reykjavík, Iceland
  • Average wind speed in September: 20.4km/h

The windiest month (with the highest average wind speed) is February (24.9km/h).
The calmest months (with the lowest average wind speed) are June and July (14.9km/h).

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Average humidity in September
Reykjavík, Iceland

Average humidity in September - Reykjavík, Iceland
  • Average humidity in September: 82%

The months with the highest relative humidity are January, February and September (82%).
The month with the lowest relative humidity is May (75%).

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Average rainfall in September
Reykjavík, Iceland

Average rainfall in September - Reykjavík, Iceland
  • Average rainfall in September: 40mm

The wettest month (with the highest rainfall) is January (47mm).
The driest months (with the least rainfall) are June and July (25mm).

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Average rainfall days in September
Reykjavík, Iceland

Average rainfall days in September - Reykjavík, Iceland
  • Average rainfall days in September: 17.8 days

The month with the highest number of rainy days is September (17.8 days).
The month with the least rainy days is December (9.7 days).

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Average snowfall in September
Reykjavík, Iceland

Average snowfall in September - Reykjavík, Iceland
  • Average snowfall in September: 0mm

The month with the highest snowfall is March (100mm).
The months with the least snowfall are June, July, August and September (0mm).

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Average snowfall days in September
Reykjavík, Iceland

Average snowfall days in September - Reykjavík, Iceland
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is March (9.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in September
Reykjavík, Iceland

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).

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Average daylight in September /
Average sunshine in September
Reykjavík, Iceland

Average daylight in September / Average sunshine in September - Reykjavík, Iceland
  • Average daylight in September: 13h and 0min

The month with the longest days is June (Average daylight: 20h and 54min).
The month with the shortest days is December (Average daylight: 4h and 24min).

  • Average sunshine in September: 4h and 3min

The month with the most sunshine is August (Average sunshine: 7h and 24min).
The month with the least sunshine is January (Average sunshine: 2h and 24min).

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Average sunshine days in September
Reykjavík, Iceland

Average sunshine days in September - Reykjavík, Iceland
  • Average sunshine days in September: 8.8 days

The month with the most sunshine days is December (14.1 days).
The month with the least sunshine days is September (8.8 days).

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Average UV index in September
Reykjavík, Iceland

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

The month with the highest UV index is July (UV index 4).
The months with the lowest UV index are January, February and November (UV index 1).

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Average cloud cover in September
Reykjavík, Iceland

Average cloud cover in September - Reykjavík, Iceland
  • Average cloud cover in September: 65

The months with the most cloud cover are March and April (Cloud cover 68).
The months with the least cloud cover are August and December (Cloud cover 60).

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Average visibility in September
Reykjavík, Iceland

Average visibility in September - Reykjavík, Iceland
  • Average visibility in September: 9km

The month with the highest visibility is June (10km).
The months with the lowest visibility are January, February, March, April, May, July, August, September, October, November and December (9km).

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Reykjavík, Iceland

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