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Weather in Iceland for September 2025

Your guide to Iceland weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in Iceland at the beginning of September is 12 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 7.9 °C by the end of September.

  • Rain 🌧️

  • Iceland experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 133.7 mm.

  • More

  • Is September a good time to visit Iceland? check out the best time to travel to Iceland page.

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
3
Dry days
Average rainy days
27
Rainy days
Average snowy days
0
Snow days
Average temperatures
10°/6°
Temperatures
Average wind speed
26 km/h
Avg max wind
Average humidity
78 %
Avg humidity

Iceland in September average weather

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Temperatures trend during September in Iceland

See the weather trend as well as the moving average line
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September weather day by day

Click on a date for more information
Date Weather Temperatures Rain UV More
1 Sept. Patchy rain possible
Patchy rain possible
12° /9° 5.4 mm 3
2 Sept. Light rain shower
Light rain shower
13° /8° 5.2 mm 3
3 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
11° /7° 3.1 mm 3
4 Sept. Moderate rain at times
Moderate rain at times
12° /8° 5 mm 3
5 Sept. Moderate rain at times
Moderate rain at times
12° /8° 4.9 mm 3
6 Sept. Light rain shower
Light rain shower
12° /9° 5.9 mm 3
7 Sept. Patchy rain possible
Patchy rain possible
12° /7° 5.3 mm 3
8 Sept. Patchy rain possible
Patchy rain possible
11° /7° 2.9 mm 3
9 Sept. Overcast
Overcast
9° /6° 10.3 mm 3
10 Sept. Patchy rain possible
Patchy rain possible
10° /6° 2.5 mm 3
11 Sept. Patchy rain possible
Patchy rain possible
9° /5° 0.5 mm 3
12 Sept. Overcast
Overcast
10° /5° 6.1 mm 3
13 Sept. Overcast
Overcast
10° /6° 3.9 mm 3
14 Sept. Patchy rain possible
Patchy rain possible
10° /6° 0.6 mm 3
15 Sept. Moderate rain at times
Moderate rain at times
10° /5° 1.4 mm 3
16 Sept. Patchy rain possible
Patchy rain possible
11° /6° 11.2 mm 3
17 Sept. Overcast
Overcast
10° /7° 4.5 mm 3
18 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
11° /6° 10.6 mm 3
19 Sept. Patchy rain possible
Patchy rain possible
10° /7° 3.9 mm 3
20 Sept. Moderate rain at times
Moderate rain at times
11° /6° 4.8 mm 3
21 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
9° /5° 7.7 mm 3
22 Sept. Patchy rain possible
Patchy rain possible
8° /5° 1.6 mm 2
23 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
8° /4° 4 mm 2
24 Sept. Patchy rain possible
Patchy rain possible
9° /4° 4.3 mm 2
25 Sept. Cloudy
Cloudy
8° /4° 0.4 mm 3
26 Sept. Patchy rain possible
Patchy rain possible
7° /3° 3.3 mm 2
27 Sept. Cloudy
Cloudy
8° /3° 1.3 mm 2
28 Sept. Patchy rain possible
Patchy rain possible
7° /4° 2.2 mm 2
29 Sept. Moderate rain at times
Moderate rain at times
8° /4° 9.3 mm 2
30 Sept. Overcast
Overcast
8° /4° 1.6 mm 2
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Important Notice
Our weather forecast for Iceland in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Iceland forecast closer to your planned date for the most up-to-date weather information.

Guide for Iceland in September

In September, Iceland experiences a transition from the lingering warmth of summer to the crisp coolness of autumn. At the beginning of the month, the weather in Iceland is characterized by mild temperatures and relatively stable conditions.

In Reykjavik, the capital city, the average temperature hovers around 10°, with occasional showers and partly cloudy skies. As the month progresses, the temperatures gradually begin to drop, and by the end of September, the average temperature in Reykjavik decreases to around 8°.

The weather becomes more unpredictable, with increased chances of rain and stronger winds.

In the countryside, particularly in the highlands, the weather can be more variable, with the possibility of early snowfall in some areas towards the end of the month. Travelers visiting Iceland in September should be prepared for changing weather conditions and pack layers to stay warm and dry.

Despite the cooler temperatures, September is still a great time to visit Iceland, as the landscapes are adorned with the vibrant colors of autumn, and the tourist crowds begin to thin out, allowing for a more intimate experience of this stunning country.

Have you visited Iceland in September? Share your experience by writing a review.

Iceland in September - FAQ

Is September a good time to visit Iceland?
You can travel to Iceland in September, but there are probably better months doing so, read more about the best time to visit Iceland
What are the expected maximum and minimum temperatures in Iceland during September?
During September, expect a variety of temperatures with highs around 10° and lows near 6°, suitable for diverse activities and preferences.
How much rainfall should be expected in Iceland during September?
Significant rainfall exceeding 133.7 mm is expected in Iceland during September, occurring over more than 27 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Iceland in September 2025?
Iceland typically sees 0.0025 cm of snowfall during September.
What are the typical wind conditions in Iceland during September?
The average wind speed in Iceland during September is 26 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Iceland in September?

As you prepare for your trip to Iceland in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Iceland, during September, is comfortable and enjoyable, regardless of the weather conditions.

  • Clothing
    • Warm Clothing: Sweaters, hoodies, long pants
    • Rain Gear: Lightweight, waterproof clothing
  • Footwear
    • Waterproof Shoes
  • Accessories
    • Scarves: To protect you from the cold wind
    • Gloves/Mittens: Essential for cold weather
    • Warm Hats: Warm hats for insulation in cold weather
    • Umbrellas/Raincoats: For rainy days

September rainfall patterns in Iceland

Explore the daily rainfall trends and prepare for Icelands September weather 💧
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Location coordinates Where is Iceland?

Get accurate weather forecasts for Iceland, located at latitude 64.135 and longitude -21.895. Stay updated with localized weather information tailored for Iceland.

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