Weather in Iceland for September 2025
In general, the average temperature in Iceland at the beginning of September is 10.7 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 7.7 °C by the end of September.
Expect significant rainfall in Iceland during September, with an average of 19 rainy days.
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  11° | 3 9° | 4 10° | 5 11° | 6 11° | 7  11° |
| 8 9° | 9 7° | 10 7° | 11  8° | 12 8° | 13 8° | 14 10° |
| 15 9° | 16  10° | 17 10° | 18 10° | 19 9° | 20 10° | 21  9° |
| 22 8° | 23 8° | 24 8° | 25  8° | 26 8° | 27 8° | 28 8° |
| 29 7° | 30 7° |
You can click on date
Temperatures trend during September in Iceland
September weather day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Overcast | 12° /9° | 7.3 mm | 3 | |
| 2 Sept. | Light rain shower | 11° /8° | 10.3 mm | 3 | |
| 3 Sept. | Light rain shower | 9° /6° | 3.8 mm | 3 | |
| 4 Sept. | Light rain shower | 10° /7° | 4.3 mm | 3 | |
| 5 Sept. | Overcast | 11° /8° | 6.6 mm | 3 | |
| 6 Sept. | Light rain shower | 11° /9° | 9.6 mm | 3 | |
| 7 Sept. | Light rain | 11° /8° | 10.3 mm | 3 | |
| 8 Sept. | Light rain shower | 9° /6° | 5.1 mm | 3 | |
| 9 Sept. | Light rain shower | 7° /4° | 2.6 mm | 2 | |
| 10 Sept. | Patchy rain possible | 7° /5° | 0.3 mm | 2 | |
| 11 Sept. | Partly cloudy | 8° /3° | 0 mm | 3 | |
| 12 Sept. | Overcast | 8° /4° | 0 mm | 2 | |
| 13 Sept. | Overcast | 8° /5° | 0 mm | 2 | |
| 14 Sept. | Partly cloudy | 10° /6° | 0.1 mm | 3 | |
| 15 Sept. | Overcast | 9° /5° | 0.4 mm | 3 | |
| 16 Sept. | Moderate rain | 10° /6° | 21 mm | 3 | |
| 17 Sept. | Light rain shower | 10° /7° | 9 mm | 3 | |
| 18 Sept. | Partly cloudy | 10° /5° | 12.2 mm | 4 | |
| 19 Sept. | Patchy rain possible | 9° /5° | 0.5 mm | 3 | |
| 20 Sept. | Partly cloudy | 10° /5° | 0.2 mm | 3 | |
| 21 Sept. | Sunny | 9° /5° | 0 mm | 3 | |
| 22 Sept. | Overcast | 8° /5° | 0.6 mm | 2 | |
| 23 Sept. | Light drizzle | 8° /5° | 1.3 mm | 2 | |
| 24 Sept. | Light rain | 8° /4° | 3.2 mm | 2 | |
| 25 Sept. | Cloudy | 8° /4° | 0.1 mm | 3 | |
| 26 Sept. | Light rain | 8° /4° | 4.6 mm | 2 | |
| 27 Sept. | Light rain | 8° /4° | 2.6 mm | 2 | |
| 28 Sept. | Patchy rain possible | 8° /5° | 0.4 mm | 2 | |
| 29 Sept. | Sunny | 7° /4° | 4 mm | 3 | |
| 30 Sept. | Light drizzle | 7° /4° | 0.6 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.
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
Quick links
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