Capital Region (Reykjavík)
September
Weather in Capital Region for September 2025
Your guide to Capital Region weather in September - trends and predictions
In general, the average temperature in Capital Region 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.
Capital Region 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 Capital Region? check out the best time to travel to Capital Region page.
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Temperatures
Rain 🌧️
More
3
Dry days
27
Rainy days
0
Snow days
10°/6°
Temperatures
26 km/h
Avg max wind
78 %
Avg humidity
Capital Region in September average weather
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| 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 Capital Region
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. | 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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Important Notice
Our weather forecast for Capital Region 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 Capital Region forecast closer to your planned date for the most up-to-date weather information.
Capital Region in September - FAQ
What are the expected maximum and minimum temperatures in Capital Region during September?
During September, expect a variety of temperatures with highs around 10° and lows near 6°, suitable for diverse activities and preferences.
How much rainfall should be expected in Capital Region during September?
Significant rainfall exceeding 133.7 mm is expected in Capital Region during September, occurring over more than 27 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Capital Region in September 2025?
Capital Region typically sees 0.0025 cm of snowfall during September.
What are the typical wind conditions in Capital Region during September?
The average wind speed in Capital Region during September is 26 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Capital Region in September?
As you prepare for your trip to Capital Region 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 Capital Region, 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 Capital Region
Explore the daily rainfall trends and prepare for Capital Regions September weather 💧
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