Keflavik in Fall
In fall (September, October and November), Keflavik sees average daytime highs around 7°C and overnight lows near 5°C, with 377 mm of precipitation over about 50 wet days across the season. It is the 2nd-warmest season and the wettest season of the year.
Over the season highs ease from about 11°C in early September to 4°C by late November. The sky is clear or mostly clear about 14% of the time across fall, and the air most often feels dry.
Fall is Keflavik's 2nd-best season to visit on our travel score. For the whole year in context, see Keflavik's year-round climate.
- Avg daytime high
- 7°C
- 2nd-warmest season
- Avg overnight low
- 5°C
- Precipitation
- 377 mm
- 50 wet days
- Avg wind
- 24 km/h
- Travel score
- 0.9
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Keflavik in Fall
Over the season highs ease from about 11°C in early September to 4°C by late November.
A typical fall day in Keflavik reaches about 7°C and drops to 5°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Keflavik
Once humidity and wind are folded in, fall brings about 0 days that feel above 32°C and 46 that feel at or below 0°C.
The story in fall is cold — wind chill drags the overnight "feels like" below the raw low.
Keflavik weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 3° / 0° | 125 | 18.8 | 9.7 | 5 | 0.0 |
| Feb | 3° / -0° | 123 | 17.4 | 10.4 | 8 | 0.0 |
| Mar | 4° / 0° | 113 | 17.6 | 9.3 | 11.2 | 0.0 |
| Apr | 6° / 2° | 91 | 15.4 | 3.4 | 14.6 | 0.3 |
| May | 8° / 5° | 79 | 13.9 | 0.5 | 17.8 | 1.2 |
| Jun | 11° / 8° | 67 | 12.8 | 0 | 20.1 | 2.3 |
| Jul | 12° / 10° | 74 | 12.8 | 0 | 19.1 | 3.0 |
| Aug | 12° / 10° | 97 | 14.2 | 0 | 16 | 2.8 |
| Sep | 10° / 7° | 134 | 17.2 | 0 | 12.7 | 1.8 |
| Oct | 7° / 4° | 120 | 15.4 | 1.6 | 9.3 | 0.8 |
| Nov | 5° / 2° | 124 | 17.2 | 4.9 | 6.1 | 0.0 |
| Dec | 4° / 1° | 129 | 18.6 | 9.1 | 3.9 | 0.0 |
Cloud cover in Fall
The sky is clear or mostly clear about 14% of the time across fall.
Chance of precipitation in Fall
Keflavik gets around 377 mm of rain and snow over 50 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 24 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 14 h 18 min in early September to 4 h 42 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 1.1 kWh/m².
Is fall a good time to visit Keflavik?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a weaker month for outdoor sightseeing in Keflavik.
What to pack for Keflavik in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Keflavik sees daytime highs around 7°C and nights near 5°C. Pack a warm layer and rain gear. Worth having: a heavy coat and a windbreaker. About 50 days see rain.
Sea temperature near Keflavik in Fall
The nearest coast averages about 8°C across fall — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 14 km away) is warmest in August at about 11°C and coldest in March near 5°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 6 | 5 | 5 | 6 | 7 | 9 | 11 | 11 | 10 | 8 | 7 | 6 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 6 | Bracing |
| Feb | 5 | Bracing |
| Mar | 5 | Bracing |
| Apr | 6 | Bracing |
| May | 7 | Bracing |
| Jun | 9 | Bracing |
| Jul | 11 | Bracing |
| Aug | 11 | Bracing |
| Sep | 10 | Bracing |
| Oct | 8 | Bracing |
| Nov | 7 | Bracing |
| Dec | 6 | Bracing |
UV index in Keflavik in Fall
Clear-sky midday UV across fall averages around 1. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Keflavik peaks around June 21 at about 4 (moderate) — a little sun protection helps at midday. It bottoms out near December 19 at about 0 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 3 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 0 | 0 | 1 | 2 | 3 | 5 | 4 | 3 | 2 | 1 | 0 | 0 |
| Level | Low | Low | Low | Moderate | Moderate | Moderate | Moderate | Moderate | Low | Low | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 0 | Low |
| Feb | 0 | Low |
| Mar | 1 | Low |
| Apr | 2 | Moderate |
| May | 3 | Moderate |
| Jun | 5 | Moderate |
| Jul | 4 | Moderate |
| Aug | 3 | Moderate |
| Sep | 2 | Low |
| Oct | 1 | Low |
| Nov | 0 | Low |
| Dec | 0 | Low |
Where is Keflavik?
Keflavik sits at 64.0°N, 22.6°W, 5 m above sea level, in Iceland. The nearest listed city is Reykjanesbær, 1.0 km away.
Topography around Keflavik
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Keflavik.
Within 3 km, the terrain around Keflavik has only modest variations in elevation — a maximum elevation change of 60 m around an average of 17 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 187 m; within 80 km, large variations in elevation — a maximum elevation change of 1,065 m.
The land around Keflavik is covered by grassland (45%) and water (37%) within 3 km, water (57%) and grassland (36%) within 16 km, and water (67%) and grassland (28%) within 80 km.
Iceland travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / F
- 230 V · 50 Hz
- Prices
- ≈ 118% of US
- price level, 2025
- GDP per capita
- $98,323
- 2025
- Happiness
- 7.5 / 10
- World Happiness, 2025
- Safe drinking water
- 100%
- of population, 2024
- Homicide rate
- 1.3
- per 100k, 2023
- Road deaths
- 2
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Keflavik (64.0049°, -22.5624°, elevation 5 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.