Blue Lagoon Weather in May
May in Blue Lagoon typically sees daytime highs of 10°C (50°F) and nighttime lows of 5°C (41°F). Rainfall is also possible this month, so it's worth packing an umbrella.
Rainfall in Blue Lagoon in May
Based on our climate data of the past 30 years, about 16 days of rain are anticipated, with 89 mm (3.5 in) on average. A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Blue Lagoon in May
Temperatures in Blue Lagoon in May top out at 10°C (50°F) and drop to 5°C (41°F) overnight. Temperatures remain on the cold side all day. A proper warm jacket is worth having, not just for evenings. Nights drop to 5°C (41°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.
Sunshine in Blue Lagoon in May
The days are predominantly sunny, with an estimated total of around 201 hours of sunshine. Despite the cool temperatures, these sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.If you're looking for dry conditions and comfortable temperatures, May may not be the ideal month to visit Blue Lagoon. 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 Blue Lagoon's climate page.
Blue Lagoon Temperature in May
Min Temperature
5°C (41°F)
Max Temperature
10°C (50°F)
Chance of Rain
54%
Precipitation
89 mm (3.5 in)
Rainy days
16 days
Humidity
76% *
Sunshine
201 hours *
Percentage Sunshine
35% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Blue Lagoon typically rise from around 7°C (45°F) at the start of May to approximately 10°C (50°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 Blue Lagoon in May
Browse day-by-day weather records for Blue Lagoon spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Blue Lagoon historical weather extremes in May
The extremes listed below come from historical weather data collected in Blue Lagoon from 1976 through 2026.
- Blue Lagoon recorded its highest May temperature of 20°C (68°F) on May 15, 1988.
- Blue Lagoon experienced its chilliest May day on May 3, 1982, reaching only -2°C (28°F).
- The coldest night in May in Blue Lagoon was on May 5, 1982, with a minimum of -6°C (21°F).
- The heaviest May precipitation occurred on May 24, 2024, when 46 mm (1.8 in) of precipitation fell.
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 Blue Lagoon in May
Cold weather calls for smart layering in May. A thermal base layer makes a huge difference in staying warm. Add a wool sweater or fleece, then a wind-resistant outer jacket. Prepare for significant rainfall with proper waterproof clothing and shoes. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Blue Lagoon 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 Blue Lagoon's climate page.
Temperature Rainfall Sunshine Humidity
See the full Blue Lagoon climate overview or explore weather in Iceland.
