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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.

  • New! Chat with our AI weatherman - it’s amazing and free.
Average dry days
10
Dry days
Average rainy days
20
Rainy days
Average snowy days
0
Snow days
Average temperatures
10°/8°
Temperatures
Average wind speed
39 km/h
Avg max wind
Average humidity
77 %
Avg humidity

Keflavík in September average weather

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Temperatures trend during September in Keflavík

See the weather trend as well as the moving average line
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September weather day by day

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Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
11° /9° 2.8 mm 3
2 Sept. Patchy rain possible
Patchy rain possible
10° /9° 1.7 mm 3
3 Sept. Cloudy
Cloudy
9° /8° 0 mm 2
4 Sept. Light rain
Light rain
10° /7° 5.5 mm 3
5 Sept. Light drizzle
Light drizzle
12° /9° 4.3 mm 3
6 Sept. Light rain
Light rain
11° /10° 5.8 mm 3
7 Sept. Moderate rain
Moderate rain
11° /9° 12.4 mm 3
8 Sept. Light rain shower
Light rain shower
10° /7° 5.4 mm 3
9 Sept. Light rain shower
Light rain shower
8° /6° 1.4 mm 3
10 Sept. Overcast
Overcast
8° /6° 0 mm 2
11 Sept. Cloudy
Cloudy
8° /6° 0.1 mm 3
12 Sept. Overcast
Overcast
10° /7° 0.1 mm 3
13 Sept. Overcast
Overcast
9° /7° 0 mm 2
14 Sept. Cloudy
Cloudy
9° /7° 0.2 mm 3
15 Sept. Cloudy
Cloudy
9° /7° 0.2 mm 3
16 Sept. Light rain shower
Light rain shower
11° /7° 24.2 mm 3
17 Sept. Light rain shower
Light rain shower
10° /7° 5.5 mm 3
18 Sept. Partly cloudy
Partly cloudy
11° /7° 6.4 mm 4
19 Sept. Patchy rain possible
Patchy rain possible
9° /7° 0.5 mm 3
20 Sept. Partly cloudy
Partly cloudy
10° /6° 0.6 mm 3
21 Sept. Sunny
Sunny
9° /7° 0.1 mm 3
22 Sept. Patchy rain possible
Patchy rain possible
9° /6° 0.7 mm 2
23 Sept. Light rain
Light rain
9° /7° 1.5 mm 2
24 Sept. Light rain
Light rain
8° /5° 3.9 mm 2
25 Sept. Overcast
Overcast
8° /5° 0.2 mm 3
26 Sept. Light rain
Light rain
8° /6° 6.9 mm 2
27 Sept. Light rain shower
Light rain shower
8° /6° 2.8 mm 3
28 Sept. Light drizzle
Light drizzle
8° /6° 1.7 mm 2
29 Sept. Partly cloudy
Partly cloudy
8° /6° 5.4 mm 3
30 Sept. Light drizzle
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

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Location coordinates Where is Keflavík?

Get accurate weather forecasts for Keflavík, located at latitude 64.005 and longitude -22.562. Stay updated with localized weather information tailored for Keflavík.

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