Mosfellsbær Weather in May
Mosfellsbær in May sees low daytime temperatures of 11°C (52°F) and nighttime lows of 4°C (39°F). Rainfall is fairly high this month at around 100 mm (3.9 in), so pack a rain jacket to stay dry.
Rainfall in Mosfellsbær in May
Historically, approximately 15 days this month are expected to have rain, averaging 100 mm (3.9 in). The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in Mosfellsbær in May
In May, Mosfellsbær gets low temperatures, with highs of 11°C (52°F). Nights cool to around 4°C (39°F). Cold conditions persist throughout the day, so warm clothing is important from the moment you head outside. With overnight lows of 4°C (39°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.
Sunshine in Mosfellsbær in May
The city usually sees around 201 hours of sunlight, indicating many sunny days despite the cool temperatures, making it a good month for sightseeing.
Wind Speed in Mosfellsbær in May
Wind speeds average 5 m/s (10 knots) during May. At this speed, gentle to moderate breezes make small trees sway and the wind creates whitecaps on water bodies. Daily variations range from moderate winds to stronger breezes, creating excellent conditions for sailing, kite flying and wind sports.
Average water temperature in May
With water temperatures around 8°C (46°F), swimming isn't really an option for most visitors. The cold sets in quickly and a wetsuit won't fully solve it.If you're looking for dry conditions and comfortable temperatures, May may not be the ideal month to visit Mosfellsbær. Our weather planner can help you explore destinations with more pleasant weather conditions.
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 Mosfellsbær's climate page.
Mosfellsbær Temperature in May
Min Temperature
4°C (39°F)
Max Temperature
11°C (52°F)
Water Temperature
8°C (46°F) *
Chance of Rain
51%
Precipitation
100 mm (3.9 in)
Rainy days
15 days
Humidity
76% *
Windspeed
5 m/s (10 knots) *
Sunshine
201 hours *
Percentage Sunshine
35% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Mosfellsbær typically rise from around 7°C (45°F) at the start of May to approximately 11°C (52°F) by the end. Nights are cold, with lows typically ranging from 2°C (36°F) to 6°C (43°F).
Average temperatures in May
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 May
Historical weather for Mosfellsbær in May
Browse day-by-day weather records for Mosfellsbær spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Mosfellsbær historical weather extremes in May
Based on 50 years of weather observations (1976-2026), these are the most extreme conditions recorded in Mosfellsbær.
- The warmest day in May was on May 18, 2025, with a maximum of 20°C (68°F).
- Mosfellsbær experienced its chilliest May day on May 3, 1982, reaching only -2°C (28°F).
- Mosfellsbær registered its coldest May night on May 5, 1982, with temperatures dropping to -7°C (19°F).
Best Places in Iceland in May
Find out more about the weather in Iceland and which places have the best travel conditions in this month. See all of Iceland in May →
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What to Wear in Mosfellsbær in May
The weather can swing between comfortable and chilly in May, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. Expect heavy rainfall, so bring good rain protection and waterproof bags. With water temperatures around 8°C (46°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Mosfellsbær in May
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 Mosfellsbær's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Mosfellsbær climate overview or explore weather in Iceland.
