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Southern Peninsula (Keflavík)
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Iceland weather

Weather in Southern Peninsula for September 2025

Your guide to Southern Peninsula weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Southern Peninsula has been nearly identical to the historical average, with a temperature of 10.8 °C (showing only a slight deviation of 0.5 °C).

  • The forecast for the next days in Southern Peninsula predicts temperatures to be around 10 °C, close to the historical average.

  • In general, the average temperature in Southern Peninsula at the beginning of September is 11 °C. As the month progressed, temperatures tended to slightly increase, reaching an average of 11.1 °C by the end of September.

    • Rain 🌧️

  • Southern Peninsula in September brings notable rainfall, with an average of 18 rainy days and a total precipitation of 101.7 mm.

Average dry days
12
Dry days
Average rainy days
18
Rainy days
Average snowy days
0
Snow days
Average temperatures
9°/7°
Temperatures
Average wind speed
39 km/h
Avg max wind
Average humidity
76 %
Avg humidity

Southern Peninsula Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Light rain shower
12°
2
Patchy rain possible
11°
3
Cloudy
10°
4
Light rain
11°
5
Light rain shower
11°
6
Light rain shower
11°
7
Moderate rain
11°
8
Light rain shower
11°
9
Light rain shower
9°
10
Overcast
9°
11
Cloudy
10°
12
Patchy rain possible
10°
13
Overcast
9°
14
Cloudy
10°
15
Cloudy
10°
16
Light rain shower
11°
17
Patchy rain possible
9°
18
Sunny
7°
19
Sunny
7°
20
Sunny
7°
21
Patchy rain possible
11°
22
Patchy rain possible
11°
23
Patchy rain possible
11°
24
Patchy rain possible
11°
25
Patchy rain possible
11°
26
Moderate rain
11°
27
Moderate rain
12°
28
Patchy rain possible
12°
29
Patchy rain possible
11°
30
Patchy rain possible
10°

Temperatures trend during September in Southern Peninsula

See the weather trend as well as the moving average line

September weather in Southern Peninsula day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
 12° /9° 3.8 mm 3
2 Sept. Patchy rain possible
Patchy rain possible
 11° /9° 0.9 mm 3
3 Sept. Cloudy
Cloudy
 10° /8° 0.1 mm 3
4 Sept. Light rain
Light rain
 11° /8° 4.8 mm 3
5 Sept. Light rain shower
Light rain shower
 11° /9° 4.4 mm 3
6 Sept. Light rain shower
Light rain shower
 11° /9° 5.3 mm 3
7 Sept. Moderate rain
Moderate rain
 11° /8° 11.1 mm 3
8 Sept. Light rain shower
Light rain shower
 11° /7° 9.2 mm 3
9 Sept. Light rain shower
Light rain shower
 9° /6° 2.3 mm 3
10 Sept. Overcast
Overcast
 9° /6° 7.8 mm 2
11 Sept. Cloudy
Cloudy
 10° /7° 1.6 mm 3
12 Sept. Patchy rain possible
Patchy rain possible
 10° /7° 0.1 mm 3
13 Sept. Overcast
Overcast
 9° /6° 0 mm 2
14 Sept. Cloudy
Cloudy
 10° /7° 0.7 mm 3
15 Sept. Cloudy
Cloudy
 10° /8° 1.1 mm 3
16 Sept. Light rain shower
Light rain shower
 11° /7° 24.2 mm 3
17 Sept. Patchy rain possible
Patchy rain possible
 9° /7° 0.5 mm 0.3
18 Sept. Sunny
Sunny
 7° /5° 0 mm 0.4
19 Sept. Sunny
Sunny
 7° /6° 0 mm 0.4
20 Sept. Sunny
Sunny
 7° /5° 0 mm 0.4
21 Sept. Patchy rain possible
Patchy rain possible
 11° /6° 3 mm 0.1
22 Sept. Patchy rain possible
Patchy rain possible
 11° /11° 0.6 mm 3
23 Sept. Patchy rain possible
Patchy rain possible
 11° /10° 0.1 mm 3
24 Sept. Patchy rain possible
Patchy rain possible
 11° /10° 0.4 mm 3
25 Sept. Patchy rain possible
Patchy rain possible
 11° /9° 0.4 mm 3
26 Sept. Moderate rain
Moderate rain
 11° /11° 13 mm 3
27 Sept. Moderate rain
Moderate rain
 12° /11° 15.3 mm 3
28 Sept. Patchy rain possible
Patchy rain possible
 12° /11° 2 mm 3
29 Sept. Patchy rain possible
Patchy rain possible
 11° /10° 1.7 mm 3
30 Sept. Patchy rain possible
Patchy rain possible
 10° /9° 0.3 mm 2
Next
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.
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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 💧
Provinces in Southern Peninsula
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Reykjanesbær
Top locations in Southern Peninsula
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Keflavík
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Location coordinates Where is Southern Peninsula?

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

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