Keflavík
September
Weather in Keflavík for September 2025
Your guide to Keflavík weather in September - trends and predictions
In general, the average temperature in Keflavík at the beginning of September is 10.6 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 8 °C by the end of September.
Expect significant rainfall in Keflavík during September, with an average of 20 rainy days.
Is September a good time to visit Keflavík? check out the best time to travel to Keflavík page.
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10
Dry days
20
Rainy days
0
Snow days
10°/8°
Temperatures
39 km/h
Avg max wind
77 %
Avg humidity
Keflavík in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  11° | 2 10° | 3  9° | 4  10° | 5 12° | 6 11° | 7  11° |
| 8 10° | 9 8° | 10  8° | 11 8° | 12 10° | 13 9° | 14 9° |
| 15 9° | 16 11° | 17 10° | 18  11° | 19 9° | 20 10° | 21  9° |
| 22 9° | 23 9° | 24 8° | 25 8° | 26 8° | 27 8° | 28 8° |
| 29 8° | 30 8° |
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Temperatures trend during September in Keflavík
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Light rain shower | 11° /9° | 2.8 mm | 3 | |
| 2 Sept. | Patchy rain possible | 10° /9° | 1.7 mm | 3 | |
| 3 Sept. | Cloudy | 9° /8° | 0 mm | 2 | |
| 4 Sept. | Light rain | 10° /7° | 5.5 mm | 3 | |
| 5 Sept. | Light drizzle | 12° /9° | 4.3 mm | 3 | |
| 6 Sept. | Light rain | 11° /10° | 5.8 mm | 3 | |
| 7 Sept. | Moderate rain | 11° /9° | 12.4 mm | 3 | |
| 8 Sept. | Light rain shower | 10° /7° | 5.4 mm | 3 | |
| 9 Sept. | Light rain shower | 8° /6° | 1.4 mm | 3 | |
| 10 Sept. | Overcast | 8° /6° | 0 mm | 2 | |
| 11 Sept. | Cloudy | 8° /6° | 0.1 mm | 3 | |
| 12 Sept. | Overcast | 10° /7° | 0.1 mm | 3 | |
| 13 Sept. | Overcast | 9° /7° | 0 mm | 2 | |
| 14 Sept. | Cloudy | 9° /7° | 0.2 mm | 3 | |
| 15 Sept. | Cloudy | 9° /7° | 0.2 mm | 3 | |
| 16 Sept. | Light rain shower | 11° /7° | 24.2 mm | 3 | |
| 17 Sept. | Light rain shower | 10° /7° | 5.5 mm | 3 | |
| 18 Sept. | Partly cloudy | 11° /7° | 6.4 mm | 4 | |
| 19 Sept. | Patchy rain possible | 9° /7° | 0.5 mm | 3 | |
| 20 Sept. | Partly cloudy | 10° /6° | 0.6 mm | 3 | |
| 21 Sept. | Sunny | 9° /7° | 0.1 mm | 3 | |
| 22 Sept. | Patchy rain possible | 9° /6° | 0.7 mm | 2 | |
| 23 Sept. | Light rain | 9° /7° | 1.5 mm | 2 | |
| 24 Sept. | Light rain | 8° /5° | 3.9 mm | 2 | |
| 25 Sept. | Overcast | 8° /5° | 0.2 mm | 3 | |
| 26 Sept. | Light rain | 8° /6° | 6.9 mm | 2 | |
| 27 Sept. | Light rain shower | 8° /6° | 2.8 mm | 3 | |
| 28 Sept. | Light drizzle | 8° /6° | 1.7 mm | 2 | |
| 29 Sept. | Partly cloudy | 8° /6° | 5.4 mm | 3 | |
| 30 Sept. | Light drizzle | 8° /5° | 1.4 mm | 3 | |
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Important Notice
Our weather forecast for Keflavík 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 Keflavík forecast closer to your planned date for the most up-to-date weather information.
Keflavík in September - FAQ
What are the expected maximum and minimum temperatures in Keflavík during September?
During September, expect a variety of temperatures with highs around 10° and lows near 8°, suitable for diverse activities and preferences.
How much rainfall should be expected in Keflavík during September?
Significant rainfall exceeding 126 mm is expected in Keflavík during September, occurring over more than 20 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Keflavík during September?
The average wind speed in Keflavík during September is 39 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Keflavík in September?
As you prepare for your trip to Keflavík 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 Keflavík, 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 Keflavík
Explore the daily rainfall trends and prepare for Keflavíks September weather 💧
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