Hafnarfjördur Weather in May
Hafnarfjördur in May sees low temperatures, with highs around 11°C (52°F) and overnight lows of 4°C (39°F). Rainfall is fairly high at around 97 mm (3.8 in) on average, so pack waterproofs just in case.
Rainfall in Hafnarfjördur in May
Typically, you can expect about 16 days of rain this month, with 97 mm (3.8 in) on average. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in Hafnarfjördur in May
Daytime highs in Hafnarfjördur in May reach 11°C (52°F), with nights around 4°C (39°F). The days stay cool from start to finish. Layering up well will make outdoor time much more comfortable. At 4°C (39°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.
Sunshine in Hafnarfjördur in May
With approximately 201 hours of sunshine, the days are filled with clear skies. Despite it being a cool month, it makes for pleasant days outside.
Wind Speed in Hafnarfjördur 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 prefer dry days with pleasant temperatures, June and July typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
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 Hafnarfjördur's climate page.
Hafnarfjördur Temperature in May
Min Temperature
4°C (39°F)
Max Temperature
11°C (52°F)
Water Temperature
8°C (46°F) *
Chance of Rain
53%
Precipitation
97 mm (3.8 in)
Rainy days
16 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 Hafnarfjördur 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 Hafnarfjördur in May
Browse day-by-day weather records for Hafnarfjördur spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Hafnarfjördur historical weather extremes in May
The extremes listed below come from historical weather data collected in Hafnarfjördur from 1976 through 2026.
- On May 18, 2025, temperatures climbed to 20°C (68°F), marking the warmest May day on record.
- The lowest daytime temperature in May was -2°C (28°F), recorded on May 3, 1982.
- Nighttime temperatures dropped to -7°C (19°F) on May 5, 1982, marking the coldest May night on record.
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 →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Hafnarfjördur in May
Pack for changing conditions in Hafnarfjördur in May. Bring a mix of short and long sleeves, a warm layer like a hoodie or light jacket, and comfortable pants. The key is being able to add or remove layers as the days goes by. Prepare for significant rainfall with proper waterproof clothing and shoes. 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. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Hafnarfjördur 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 Hafnarfjördur's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Hafnarfjördur climate overview or explore weather in Iceland.
