Southern Peninsula (Keflavík)
September
Weather in Southern Peninsula for September 2025
Your guide to Southern Peninsula weather in September - trends and predictions
In general, the average temperature in Southern Peninsula 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.
Southern Peninsula in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 101.7 mm.
Is September a good time to visit Southern Peninsula? check out the best time to travel to Southern Peninsula page.
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Temperatures
Rain 🌧️
More
12
Dry days
18
Rainy days
0
Snow days
9°/7°
Temperatures
39 km/h
Avg max wind
76 %
Avg humidity
Southern Peninsula 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 Southern Peninsula
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 Southern Peninsula 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 Southern Peninsula forecast closer to your planned date for the most up-to-date weather information.
Southern Peninsula in September - FAQ
What are the expected maximum and minimum temperatures in Southern Peninsula during September?
During September, expect a variety of temperatures with highs around 9° and lows near 7°, suitable for diverse activities and preferences.
How much rainfall should be expected in Southern Peninsula during September?
Significant rainfall exceeding 101.7 mm is expected in Southern Peninsula during September, occurring over more than 18 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Southern Peninsula in September 2025?
Southern Peninsula typically sees 0 cm of snowfall during September.
What are the typical wind conditions in Southern Peninsula during September?
The average wind speed in Southern Peninsula during September is 39 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Southern Peninsula in September?
As you prepare for your trip to Southern Peninsula 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 Southern Peninsula, 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 Southern Peninsula
Explore the daily rainfall trends and prepare for Southern Peninsulas September weather 💧
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