Reykjavík, Iceland — Weather in September 2026

Climate Overview

Reykjavík, Iceland in September has mild conditions, with highs averaging 10.5°C (51°F) and noticeably cooler mornings. Rain falls on about 18 days this month, totalling around 133 mm. Sea temperature stays cool at 10.8°C (51°F).

This month falls at the beginning of Autumn.

Daily highs in September gradually drop from around 13°C (55°F) at the start to 9°C (48°F) by month's end.

September sees fairly even rainfall, totalling about 133 mm across the month.

Expect around 8.6h of sunshine at the start of September, decreasing to 6.2h by the end.

The warmest days tend to fall around the 3th, averaging 12.6°C (55°F).

Compared to August, this month is about 3°C cooler with 4 more rainy days. Temperatures begin dropping heading into October.

Monthly September Averages

Temperature

11°C / 6°C

Feels Like

7°C / 2°C

Rain

18 days · 133 mm

Sunshine

7.2h / day

Humidity

85% — Very Humid

Wind

22 km/h

Wind Direction

E (91°)

Gusts

47 km/h

Daylight

13 h

Cloud Cover

77%

Clear Sky Days

UV Index

2.2 — Moderate

Sea Temperature

11°C

Dew Point

6°C — Dry

Moon Phase

Waxing Crescent · 11%

Frost Days

1 days

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

HighLow

Daily Precipitation

Rainfall

Daily Sunshine

Sunshine

Daily Wind Speed

Wind Speed

Sun Position

Sunrise 06:51

Daylight 13.1h

Sunset 19:57

What to Expect

Keep afternoons flexible as tropical showers are common — they typically clear within an hour.

Wet weather can spread across much of the day, so it is best to keep outdoor plans flexible.

2 of the last 5 yearly records were warmer than this month's long-run average.

Compare Months

Month	Temp	Feels Like	Rain	Sun	Humidity	UV	Status	Details
January	0°C / -4°C	-4°C / -10°C	18days (127 mm) Wet	1.4h Poor	82% Humid	0.2 Low	Wet	View Details
February	2°C / -3°C	-3°C / -8°C	18days (131 mm) Wet	3.5h Poor	83% Humid	0.8 Low	Wet	View Details
March	3°C / -2°C	-1°C / -7°C	18days (118 mm) Wet	6.6h Fair	79% Humid	1.8 Low	Wet	View Details
April	7°C / 1°C	3°C / -3°C	15days (109 mm) Wet	8.7h Good	79% Humid	3.2 Moderate	Poor	View Details
May	10°C / 4°C	7°C / 0°C	18days (109 mm) Wet	10.9h Excellent	78% Humid	3.9 Moderate	Wet	View Details
June best	12°C / 7°C	10°C / 4°C	15days (86 mm) Wet	10.8h Excellent	79% Humid	4.1 Moderate	Fair	View Details
July best	15°C / 9°C	13°C / 7°C	14days (73 mm) Wet	10.5h Excellent	81% Humid	3.9 Moderate	Fair	View Details
August best	14°C / 8°C	12°C / 6°C	14days (90 mm) Wet	9.5h Good	82% Humid	3.2 Moderate	Fair	View Details
September	11°C / 6°C	7°C / 2°C	18days (133 mm) Wet	7.2h Good	85% Humid	2.2 Moderate	Wet	View Details
October	7°C / 2°C	3°C / -2°C	17days (127 mm) Wet	4.5h Fair	86% Very Muggy	1 Low	Poor	View Details
November	3°C / -1°C	-1°C / -5°C	14days (102 mm) Wet	1.9h Poor	85% Humid	0.4 Low	Poor	View Details
December	1°C / -3°C	-4°C / -8°C	16days (110 mm) Wet	1.1h Poor	83% Humid	0.1 Low	Poor	View Details

What to Wear

Bundle up with a warm coat, scarf, and closed-toe shoes. Thermal layers underneath give flexibility between indoors and outdoors.

A waterproof jacket or compact umbrella is recommended for occasional showers.

Packing List

Layered clothingLight jacketUmbrellaWaterproof jacketWaterproof shoes

Frequently Asked Questions

Expand all

Is September a good time to visit Reykjavík?

September is typically wet for visiting Reykjavík, with average highs of 11°C (51°F) and around 18 rainy days. Reykjavík, Iceland in September has mild conditions, with highs averaging 10.5°C (51°F) and noticeably cooler mornings.

Does it rain a lot in Reykjavík in September?

Reykjavík typically sees around 18 rainy days in September with 133 mm (5.2 in) of total rainfall. Pack a waterproof jacket.

Does it get cold at night in Reykjavík in September?

Nights in Reykjavík during September are cool at around 6°C (42°F). Bring a jacket or sweater for evenings.

What should I pack for Reykjavík in September?

With highs of 11°C (51°F) and lows of 6°C (42°F) in September, we recommend: Layered clothing, Light jacket, Umbrella, Waterproof jacket, Waterproof shoes. Comfortable walking shoes are essential.

Is September among the best months weather-wise in Reykjavík?

September is not the most favourable month weather-wise in Reykjavík. Consider visiting during months with milder temperatures or less rainfall for a better experience.

What is the UV index in Reykjavík in September?

The average UV index in Reykjavík during September is 2 (low). No special sun protection is needed.

How many hours of daylight are there in Reykjavík in September?

Reykjavík gets approximately 13 hours of daylight per day in September, with around 7 hours of sunshine.

Does it snow in Reykjavík in September?

Snow is uncommon in Reykjavík during September based on 10-year climate averages.

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