Weather in Keflavik in september
Climate normals based on 10 years of historical data for Keflavik, Island.
Average high
10°C
Average low
7°C
Rainfall
147 mm
18 rainy days
Sunshine
1.9h/day
Luftfuktighet
79%
How Hot Is Keflavik in september?
Expect daytime highs around 10°C and overnight lows near 7°C in Keflavik during September — an average of 9°C across the day. Temperatures climb 2°C over August's averages in Keflavik.
Sunshine Hours in september
Persistent cloud limits Keflavik to about 1.9h of sun a day in September.
Does It Rain In Keflavik In september?
Heavy rain is common in Keflavik: 147mm across 18 days in September.
Is Keflavik Humid In september?
Tropical-style humidity defines Keflavik's September: 79% on average, with constant mugginess.
Wind In Keflavik In september
Sea breeze or thermal winds keep Keflavik moving at 31 kph in September.
Cloud Cover In Keflavik In september
Keflavik's September runs cloudy: typical cloud cover of 74%.
Cities With Similar Weather In september
Weather in Keflavik, month by month
| Month | High / Low | Regn | |
|---|---|---|---|
| Vädret i januari | 3°C / -1°C | 137mm | Details → |
| Vädret i februari | 4°C / 0°C | 138mm | Details → |
| Vädret i mars | 4°C / 0°C | 125mm | Details → |
| Vädret i april | 6°C / 3°C | 126mm | Details → |
| Vädret i maj | 8°C / 5°C | 125mm | Details → |
| Vädret i juni | 10°C / 8°C | 96mm | Details → |
| Vädret i juli | 12°C / 9°C | 93mm | Details → |
| Vädret i augusti | 12°C / 9°C | 111mm | Details → |
| Vädret i september | 10°C / 7°C | 147mm | |
| Vädret i oktober | 8°C / 5°C | 152mm | Details → |
| Vädret i november | 5°C / 2°C | 127mm | Details → |
| Vädret i december | 3°C / 0°C | 126mm | Details → |