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Weather in Iceland, California for September 2026

Your guide to Iceland weather in September - trends and predictions

    Official Weather Alert ⚠️

  • Wind Advisory - See hour by hour.

    • Temperatures

  • Until now, September 2026 in Iceland is cooler than usual, with temperatures averaging 16.5 °F, this is 4.1 °F below the typical seasonal average.

  • The forecast for the next days in Iceland predicts temperatures to be around 20 °F, close to the historical average.

  • In general, the average temperature in Iceland at the beginning of September is 21.4 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 20 °F by the end of September.

    • Rain 🌧️

  • With an average of 4 rainy days, Iceland experiences minimal rainfall in September.

    • More

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

Average dry days
26
Dry days
Average rainy days
4
Rainy days
Average snowy days
0
Snow days
Average temperatures
21°/9°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
47 %
Avg humidity

Iceland Weather September

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

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 UV More
Sept. 1 Sunny
Sunny
 23° /10° 0 mm 7
Sept. 2 Sunny
Sunny
 19° /9° 0 mm 5
Sept. 3 Partly cloudy
Partly cloudy
 21° /8° 0.5 mm 7
Sept. 4 Sunny
Sunny
 21° /9° 0.6 mm 5
Sept. 5 Sunny
Sunny
 23° /9° 0 mm 8
Sept. 6 Sunny
Sunny
 22° /9° 0.3 mm 7
Sept. 7 Overcast
Overcast
 21° /8° 0 mm 7
Sept. 8 Sunny
Sunny
 21° /8° 0 mm 7
Sept. 9 Sunny
Sunny
 19° /8° 0 mm 4
Sept. 10 Overcast
Overcast
 18° /9° 0.3 mm 4
Sept. 11 Sunny
Sunny
 18° /6° 0 mm 7
Sept. 12 Sunny
Sunny
 19° /6° 0 mm 7
Sept. 13 Sunny
Sunny
 16° /6° 0 mm 7.9
Sept. 14 Sunny
Sunny
 19° /5° 0 mm 7.3
Sept. 15 Sunny
Sunny
 20° /7° 0 mm 7.1
Sept. 16 Sunny
Sunny
 22° /8° 0 mm 7
Sept. 17 Sunny
Sunny
 22° /10° 0 mm 6
Sept. 18 Sunny
Sunny
 23° /11° 0 mm 6
Sept. 19 Sunny
Sunny
 23° /11° 0 mm 6
Sept. 20 Sunny
Sunny
 22° /10° 0 mm 6
Sept. 21 Overcast
Overcast
 20° /10° 0 mm 5
Sept. 22 Sunny
Sunny
 21° /9° 0 mm 6
Sept. 23 Sunny
Sunny
 22° /10° 0 mm 6
Sept. 24 Overcast
Overcast
 17° /7° 0 mm 4
Sept. 25 Sunny
Sunny
 16° /1° 0 mm 4
Sept. 26 Sunny
Sunny
 24° /9° 0 mm 6
Sept. 27 Sunny
Sunny
 24° /11° 0 mm 7
Sept. 28 Sunny
Sunny
 21° /10° 0 mm 6
Sept. 29 Sunny
Sunny
 21° /9° 0 mm 5
Sept. 30 Overcast
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.
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 21° and cooler nights around 9°. 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 27.3 mm across approximately 4 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 16 km/h, suggesting breezy to windy conditions, depending on your activities.

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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