Weather in Iceland for September 2025
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.
Iceland experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 133.7 mm.
Is September a good time to visit Iceland? check out the best time to travel to Iceland page.
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Iceland in September average weather
Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
---|---|---|---|---|---|---|
1 12° | 2 13° | 3 11° | 4 12° | 5 12° | 6 12° | 7 12° |
8 11° | 9 9° | 10 10° | 11 9° | 12 10° | 13 10° | 14 10° |
15 10° | 16 11° | 17 10° | 18 11° | 19 10° | 20 11° | 21 9° |
22 8° | 23 8° | 24 9° | 25 8° | 26 7° | 27 8° | 28 7° |
29 8° | 30 8° |
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Temperatures trend during September in Iceland
September weather day by day
Date | Weather | Temperatures | Rain | UV | More |
---|---|---|---|---|---|
1 Sept. | Patchy rain possible | 12° /9° | 5.4 mm | 3 | |
2 Sept. | Light rain shower | 13° /8° | 5.2 mm | 3 | |
3 Sept. | Moderate or heavy rain shower | 11° /7° | 3.1 mm | 3 | |
4 Sept. | Moderate rain at times | 12° /8° | 5 mm | 3 | |
5 Sept. | Moderate rain at times | 12° /8° | 4.9 mm | 3 | |
6 Sept. | Light rain shower | 12° /9° | 5.9 mm | 3 | |
7 Sept. | Patchy rain possible | 12° /7° | 5.3 mm | 3 | |
8 Sept. | Patchy rain possible | 11° /7° | 2.9 mm | 3 | |
9 Sept. | Overcast | 9° /6° | 10.3 mm | 3 | |
10 Sept. | Patchy rain possible | 10° /6° | 2.5 mm | 3 | |
11 Sept. | Patchy rain possible | 9° /5° | 0.5 mm | 3 | |
12 Sept. | Overcast | 10° /5° | 6.1 mm | 3 | |
13 Sept. | Overcast | 10° /6° | 3.9 mm | 3 | |
14 Sept. | Patchy rain possible | 10° /6° | 0.6 mm | 3 | |
15 Sept. | Moderate rain at times | 10° /5° | 1.4 mm | 3 | |
16 Sept. | Patchy rain possible | 11° /6° | 11.2 mm | 3 | |
17 Sept. | Overcast | 10° /7° | 4.5 mm | 3 | |
18 Sept. | Moderate or heavy rain shower | 11° /6° | 10.6 mm | 3 | |
19 Sept. | Patchy rain possible | 10° /7° | 3.9 mm | 3 | |
20 Sept. | Moderate rain at times | 11° /6° | 4.8 mm | 3 | |
21 Sept. | Moderate or heavy rain shower | 9° /5° | 7.7 mm | 3 | |
22 Sept. | Patchy rain possible | 8° /5° | 1.6 mm | 2 | |
23 Sept. | Moderate or heavy rain shower | 8° /4° | 4 mm | 2 | |
24 Sept. | Patchy rain possible | 9° /4° | 4.3 mm | 2 | |
25 Sept. | Cloudy | 8° /4° | 0.4 mm | 3 | |
26 Sept. | Patchy rain possible | 7° /3° | 3.3 mm | 2 | |
27 Sept. | Cloudy | 8° /3° | 1.3 mm | 2 | |
28 Sept. | Patchy rain possible | 7° /4° | 2.2 mm | 2 | |
29 Sept. | Moderate rain at times | 8° /4° | 9.3 mm | 2 | |
30 Sept. | Overcast | 8° /4° | 1.6 mm | 2 | |
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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
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
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