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.
Temperatures
Rain 🌧️
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.
September rainfall patterns in Southern Peninsula
Explore the daily rainfall trends and prepare for Southern Peninsulas September weather 💧
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