September could be a good time to visit Reykjavik, as the weather is generally fine. The average high temperature is around +52°F, and there are typically 3 sunny days in September. However, expect about 20 rainy days, and total monthly rainfall of approximately 98 mm. The weather is changeable so pack for every eventuality. Search flightsin one click on Avionero.
Average weather
☀️
+52°F
Avg. max. temperature
+27°F
Min.
+64°F
Max.
98 mm
Total precipitation
78%
Avg. humidity
4 m/s
Avg. wind
3 ☀️
Sunny Days
7 ⛅️
Cloudy
20 🌦
Rainy
Our opinion: Reykjavik has OK weather in September.
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Average temperature in Reykjavik in September
Here are the expected maximum, average and minimum temperatures in Reykjavik for September based on the historical data.
Last Year
Historical Data
The expected average maximum temperature in September is +52°F with a maximum of +57°F and a minimum of +34°F.
The average maximum temperature goes down 23% by the end of the month, compared with the beginning of the month, from +55°F to +50°F.
Is Reykjavik warm or cold in September?
Reykjavik is typically chill in September.
Maximum temperatures go down compared to the previous month from +57°F to +52°F. The minimum temperature also goes down from +48°F to +43°F.
Pack a jumper and a jacket as there will be cooler temperatures.
Take a look at how September is compared to other months in Reykjavik:
Water temperature in Reykjavik in September
Water in Reykjavik in September is Cold. It varies from +47°F to +52°F, with an average of +49°F.This is almost similar to the air temperature, which averages +52°F.
The water temperature in September is one of the warmest of the entire year:
The warmest water temperatures in Reykjavik are reached in July, when the average sea temperature rises to +53°F. The coldest water temperatures are in March, with an average of +41°F.
Can you swim in Reykjavik in September?
We would not recommend swimming in Reykjavik in September, the water is very cold (+49°F on average). Consider swimming only if you are an experienced cold-water swimmer with proper gear.
🦭
Cold
Below +61°F
🏄♂️
Fresh
61°F - 70°F
🏊
Comfortable
70°F - 77°F
👙
Warm
77°F - 82°F
🔥
Very warm
+82°C and up
You will need a full-body wetsuit, cap, gloves, a warm change of clothes, and a hot drink ready for after your swim.
Climate in Reykjavik in September
Reykjavik weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+57°F
+52°F
+45°F
Min. temperature
+36°F
+27°F
+14°F
Max. temperature
+75°F
+64°F
+59°F
Rainfall
87 mm
98 mm
86 mm
Wind
3 m/s
4 m/s
4 m/s
Avg. water temperature
+52°F
+49°F
+47°F
Humidity
79%
78%
78%
Air pressure
1007 HPa
1004 HPa
1002 HPa
Sunny days
3
3
4
Cloudy days
8
7
8
Rainy days
20
20
16
Snowy days
0
0
3
September weather is still as ok as in August.It’s getting colder in September. From +57°F in the day, the average maximum temperature lowers to +52°F.Prepare for more rain. Average rainfall goes from 87 mm to 98 mm.It feels drier, as humidity decreases from 79% to 78%.Winds are stronger in comparison to August, going up from 3 m/s to 4 m/s on average.The amount of sunny days stay about the same, averaging 3 sunny days during the month.
October brings much the same weather, it remains ok.
Wind speed in Reykjavik in September based on historical data.
Last Year
Historical Data
The average wind speed is 4 m/s getting up to 11 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Reykjavik is gradually decreasing during September, going from 8 m/s to 5 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in Reykjavik based on historical data.
Last Year
Historical Data
Total precipitation in September is about 107 mm, with a 60% chance of rain on a typical day. The maximum amount of rainfall per day is around 20 mm, which is considered light rain.September is a pretty wet month with over 18 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
September is one of the rainiest months in Reykjavik, here is a comparison with other months, total mm:
Reykjavik wettest month is September, where a typical day has a 67% chance of precipitation and 98 mm of rainfall per day. March, on the other hand, is the driest month with a mere 26% chance of precipitation and 65 mm of rainfall per day.
How was the weather last September in Reykjavik?
This is the weather in Reykjavik in September 2023:
1 September
☁️
+55°F
2 September
🌧️
+56°F
3 September
🌧️
+51°F
4 September
🌧️
+53°F
5 September
☁️
+55°F
6 September
🌧️
+55°F
7 September
🌫️
+53°F
8 September
🌧️
+52°F
9 September
☁️
+52°F
10 September
☁️
+52°F
11 September
☀️
+50°F
12 September
☁️
+51°F
13 September
☀️
+52°F
14 September
☀️
+56°F
15 September
☁️
+51°F
16 September
🌧️
+53°F
17 September
☁️
+50°F
18 September
☀️
+55°F
19 September
🌧️
+52°F
20 September
☀️
+54°F
21 September
☀️
+50°F
22 September
☀️
+46°F
23 September
🌧️
+49°F
24 September
☀️
+49°F
25 September
☀️
+57°F
26 September
🌧️
+53°F
27 September
🌧️
+52°F
28 September
☀️
+53°F
29 September
☀️
+49°F
30 September
☀️
+50°F
In September 2023 Reykjavik had 12 sunny days, 7 cloudy days, and 10 rainy days. The average maximum temperature was +52°F, with an absolute maximum of +57°F and a minimum of +46°F. The average humidity was 82%, with a maximum of 100% and a minimum of 54%. The average wind speed was 4 m/s, with a maximum of 18 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change Over the Years
This is how Reykjavik climate has changed over the last 43 years.
The climate in Reykjavik in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1979 (+42°F) and the highest in 2003 (+48°F). The driest year was 2019 with only 289 mm of rainfall, and the wettest year was 2003 with 1379 mm.
FAQ
Frequently asked questions about the weather in Reykjavik in September:
Is September a good time to visit Reykjavik?
It’s always a good time to visit Reykjavik, but the weather is changeable in September, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in Reykjavik in September?
Not really, September is not the best time to sunbathe, unless you visit a local solarium.
Can you swim in Reykjavik in September?
Swimming in Reykjavik in September is challenging and not recommended for inexperienced swimmers or without proper equipment and preparation.
Is Reykjavik rainy in September?
Reykjavik is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Reykjavik in September?
Usually, it’s not very sunny in Reykjavik in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
For this page, we’ve looked at the typical weather in Reykjavik, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
