Iceland (CA)
September
Weather in Iceland, California for September 2026
Your guide to Iceland weather in September - trends and predictions
In general, the average temperature in Iceland at the beginning of September is 24.9 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 21.9 °F by the end of September.
With an average of 2 rainy days, Iceland experiences minimal rainfall in September.
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Temperatures
Rain 🌧️
More
28
Dry days
2
Rainy days
0
Snow days
22°/8°
Temperatures
17 km/h
Avg max wind
39 %
Avg humidity
Iceland Weather September
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Temperatures trend during September in Iceland
See the weather trend as well as the moving average line
September weather in Iceland day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 26° /13° | 0 mm | 7 | |
| Sept. 2 | Sunny | 23° /13° | 0 mm | 6 | |
| Sept. 3 | Sunny | 25° /10° | 0 mm | 7 | |
| Sept. 4 | Sunny | 26° /12° | 0 mm | 7 | |
| Sept. 5 | Sunny | 27° /12° | 0 mm | 7 | |
| Sept. 6 |  Moderate rain at times | 25° /12° | 0.4 mm | 6 | |
| Sept. 7 |  Overcast | 22° /10° | 0 mm | 6 | |
| Sept. 8 | Sunny | 21° /8° | 0 mm | 6 | |
| Sept. 9 | Sunny | 17° /7° | 0 mm | 5 | |
| Sept. 10 | Overcast | 17° /7° | 0 mm | 4 | |
| Sept. 11 | Sunny | 17° /5° | 0 mm | 5 | |
| Sept. 12 | Sunny | 19° /5° | 0 mm | 5 | |
| Sept. 13 | Sunny | 21° /7° | 0 mm | 6 | |
| Sept. 14 | Sunny | 22° /8° | 0 mm | 6 | |
| Sept. 15 | Sunny | 21° /7° | 0 mm | 6 | |
| Sept. 16 |  Heavy rain at times | 18° /7° | 1.1 mm | 5 | |
| Sept. 17 | Overcast | 17° /8° | 0 mm | 5 | |
| Sept. 18 | Moderate or heavy rain shower | 16° /10° | 14.1 mm | 4 | |
| Sept. 19 |  Patchy rain possible | 15° /7° | 9.9 mm | 4 | |
| Sept. 20 | Sunny | 20° /9° | 0 mm | 6 | |
| Sept. 21 | Patchy rain possible | 20° /9° | 0.1 mm | 5 | |
| Sept. 22 | Sunny | 22° /9° | 0 mm | 6 | |
| Sept. 23 |  Partly cloudy | 24° /11° | 0 mm | 7 | |
| Sept. 24 | Sunny | 25° /11° | 0 mm | 7 | |
| Sept. 25 | Sunny | 21° /11° | 1.8 mm | 6 | |
| Sept. 26 | Sunny | 24° /9° | 0 mm | 6 | |
| Sept. 27 | Sunny | 24° /11° | 0 mm | 7 | |
| Sept. 28 | Sunny | 21° /10° | 0 mm | 6 | |
| Sept. 29 | Sunny | 21° /9° | 0 mm | 5 | |
| Sept. 30 | Overcast | 17° /8° | 0 mm | 4 | |
| 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.
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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.
September rainfall patterns in Iceland
Explore the daily rainfall trends and prepare for Icelands September weather 💧
Typically, Iceland has 2 rainy days in September with a total of 31.4 mm of rainfall.
UV exposure in Iceland during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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