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Weather in Iceland, California for September 2025

Your guide to Iceland weather in September - trends and predictions

    Snow Forecast ❄️

  • Snowfall in Iceland during September is quite rare, with fewer than 2 snowy days on average.
    According to Iceland snow forecast for September 2025, 1 snowy day is expected until the end of the month at Saturday, September 27.

    • Temperatures

  • Until now, September 2025 in Iceland has been significantly cooler than historical averages by -2 °F, with average temperature of 19.9 °F.

  • The forecast for the next days in Iceland predicts a temperature of 16.9 °F, which is cooler than the historical average.

  • In general, the average temperature in Iceland at the beginning of September is 24.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 11 °F by the end of September.

    • Rain 🌧️

  • With an average of 2 rainy days, Iceland experiences minimal rainfall in September.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
28
Dry days
Average rainy days
2
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/8°
Temperatures
Average wind speed
17 km/h
Avg max wind
Average humidity
39 %
Avg humidity

Iceland Weather September

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

Temperatures trend during September in Iceland

See the weather trend as well as the moving average line

September weather in Iceland day by day

Click on a date for more information
August October
Date Weather Temperatures Rain Snow More
Sept. 1 Sunny
Sunny
 26° /13° 0 mm 0 cm
Sept. 2 Sunny
Sunny
 23° /13° 0 mm 0 cm
Sept. 3 Sunny
Sunny
 25° /10° 0 mm 0 cm
Sept. 4 Sunny
Sunny
 26° /12° 0 mm 0 cm
Sept. 5 Sunny
Sunny
 27° /12° 0 mm 0 cm
Sept. 6 Moderate rain at times
Moderate rain at times
 25° /12° 0.4 mm 0 cm
Sept. 7 Overcast
Overcast
 22° /10° 0 mm 0 cm
Sept. 8 Sunny
Sunny
 21° /8° 0 mm 0 cm
Sept. 9 Sunny
Sunny
 17° /7° 0 mm 0 cm
Sept. 10 Overcast
Overcast
 17° /7° 0 mm 0 cm
Sept. 11 Sunny
Sunny
 17° /5° 0 mm 0 cm
Sept. 12 Sunny
Sunny
 19° /5° 0 mm 0 cm
Sept. 13 Sunny
Sunny
 21° /7° 0 mm 0 cm
Sept. 14 Sunny
Sunny
 22° /8° 0 mm 0 cm
Sept. 15 Sunny
Sunny
 21° /7° 0 mm 0 cm
Sept. 16 Heavy rain at times
Heavy rain at times
 18° /7° 1.1 mm 0 cm
Sept. 17 Sunny
Sunny
 28° /14° 0 mm 0 cm
Sept. 18 Overcast
Overcast
 23° /10° 0 mm 0 cm
Sept. 19 Heavy rain
Heavy rain
 18° /13° 28.3 mm 0 cm
Sept. 20 Patchy rain possible
Patchy rain possible
 22° /9° 2.2 mm 0 cm
Sept. 21 Sunny
Sunny
 23° /7° 0 mm 0 cm
Sept. 22 Sunny
Sunny
 25° /7° 0 mm 0 cm
Sept. 23 Patchy rain possible
Patchy rain possible
 20° /6° 1.1 mm 0 cm
Sept. 24 Patchy rain possible
Patchy rain possible
 12° /2° 0.2 mm 0 cm
Sept. 25 Sunny
Sunny
 16° /1° 0 mm 0 cm
Sept. 26 Patchy rain possible
Patchy rain possible
 7° /4° 4.2 mm 0 cm
Sept. 27 Patchy rain possible
Patchy rain possible
 5° /2° 4.2 mm 0.3 cm
Sept. 28 Patchy rain possible
Patchy rain possible
 7° /-1° 0.2 mm 0 cm
Sept. 29 Sunny
Sunny
 15° /0° 0 mm 0 cm
Sept. 30 Partly cloudy
Partly cloudy
 15° /2° 0 mm 0 cm
Next
Important Notice
Our weather forecast for Iceland 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 Iceland forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Iceland in September - FAQ

What are the expected maximum and minimum temperatures in Iceland during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 8°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Iceland during September?
In September, Iceland can expect light to moderate rainfall, totaling 31.4 mm across approximately 2 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Iceland during September?
The average wind speed in Iceland during September is 17 km/h, suggesting breezy to windy conditions, depending on your activities.

Iceland snow forecast September 2025

Track daily snowfall levels and discover Iceland’s snowy potential this September ❄️

September rainfall patterns in Iceland

Explore the daily rainfall trends and prepare for Icelands September weather 💧

UV exposure in Iceland during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

Quick links

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Location coordinates Where is Iceland?

Get accurate weather forecasts for Iceland, located at latitude 39.375 and longitude -120.026. Stay updated with localized weather information tailored for Iceland.

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