Keflavík Weather in December
During December, Keflavík experiences low daytime temperatures of 5°C (41°F) and cooler nights around 1°C (34°F). Expect quite a bit of rainfall. Around 139 mm (5.5 in) is typical.
Rainfall in Keflavík in December
Climate statistics over the past 30 years suggest around 20 days of rain, with 139 mm (5.5 in) average for the month. This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.
Temperature in Keflavík in December
Temperatures in Keflavík in December top out at 5°C (41°F) and drop to 1°C (34°F) overnight. Cold conditions persist throughout the day, so warm clothing is important from the moment you head outside. With overnight lows of 1°C (34°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.
Sunshine in Keflavík in December
This month is characterized by fewer sunny days, with about 20 hours of sunshine. It's great for those who appreciate cooler, less sunny days.December in Keflavík has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Iceland, check out our Keflavík's climate page.
Keflavík Temperature in December
Min Temperature
1°C (34°F)
Max Temperature
5°C (41°F)
Chance of Rain
67%
Precipitation
139 mm (5.5 in)
Rainy days
20 days
Humidity
79% *
Sunshine
20 hours *
Percentage Sunshine
15% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Keflavík typically stay consistent throughout December, with daily highs averaging around 5°C (41°F). Nights are very cold, with lows typically ranging from -2°C (28°F) to 0°C (32°F).
Average temperatures in December
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather for Keflavík in December
Browse day-by-day weather records for Keflavík spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Keflavík historical weather extremes in December
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Keflavík.
- The warmest day in December was on December 11, 2009, with a maximum of 10°C (50°F).
- On December 19, 1989, Keflavík saw its coldest December day with temperatures maxing out at -8°C (18°F).
- The coldest night in December in Keflavík was on December 10, 2011, with a minimum of -12°C (10°F).
Best Places in Iceland in December
Find out more about the weather in Iceland and which places have the best travel conditions in this month. See all of Iceland in December →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Keflavík in December
Dress warmly and in layers for your trip to Keflavík in December. A good base layer system works wonders. Start with good thermal underwear, add something warm like a fleece sweater, then finish with a waterproof jacket on top. Expect heavy rainfall, so bring good rain protection and waterproof bags. With limited sunshine expected, sunglasses aren't a priority for packing.What To Do in Keflavík in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Iceland, check out our Keflavík's climate page.
Temperature Rainfall Sunshine Humidity
See the full Keflavík climate overview or explore weather in Iceland.
