May · Iceland
Best time to visit Blue Lagoon in May Weather, crowds & prices
Weather in Blue Lagoon in May
Average temperature 7°C, 126 mm of rain, about 15 days with 6+ hours of sunshine and 86% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
May score
6.2/10
Ranked #4 of 12 months
- Avg temp
- 7°C
- Rainfall
- 126 mm
- Humidity
- 86%
- Days with 6h+ sun
- 15
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
May in Blue Lagoon scores 6.2/10 for nature and wildlife travel - an above-average month (#4 of 12). Expect around 7°C, 126 mm of rain, and roughly 15 days with 6+ hours of sunshine this month.
Milky geothermal waters in a black lava field, striking year-round against cool Icelandic air.
May in Blue Lagoon: mixed conditions, plan around the weather
Expect 7°C (44°F) in May. A good month for city streets, viewpoints and long meals; leave swimming for another season.
126 mm of rain signals a properly wet month, with only about 15 days with 6+ hours of sunshine to count on — build indoor options into the schedule.
That is 6.2/10 on the same scale — 4th of 12 months, versus 7.7/10 for the best month here.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a proper rain shell rather than an umbrella, footwear you can get muddy.
Expect mid-season pricing, and crowds are moderate.
If your dates are flexible, July is materially better in Blue Lagoon — 1.5 points higher on the same scale.
Frequently asked
- What is the weather like in Blue Lagoon in May?
- In May, Blue Lagoon averages 7°C, 126 mm of rain, and about 15 days with 6+ hours of sunshine. Its climate-comfort score is 6.2/10.
- Is May a good time to visit Blue Lagoon?
- May earns a 6.2/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Blue Lagoon in May?
- Expect about 126 mm of rain in May. Average humidity is 86% and there are about 15 days with 6+ hours of sunshine.
Curated in Blue Lagoon
Tickets & experiences
Things to do in Blue Lagoon
Blue Lagoon, Iceland. Live activities and tours from GetYourGuide, matched to this destination.