January in Blue Lagoon — off-season conditions
Hardest · 1.6/10January averages 1°C (33°F), cold enough that sightseeing works in bursts rather than in one long day on foot.
At 153 mm of water-equivalent precipitation this is a snowy month at resort level — that is snowpack, not lost days — with almost no days with 6+ hours of sunshine and 5 hours of daylight.
It scores 1.6/10 here, 12th of 12 months, against 7.7/10 in the destination's best month.
Plan for low-season pricing, with crowds are light for this destination.
Pack insulated layers, a windproof shell, gloves and boots with grip, a proper rain shell rather than an umbrella, footwear you can get muddy.
Flexible dates? July scores 6.1 points higher here — enough to change the trip.
February in Blue Lagoon — off-season conditions
Hardest · 2.2/10February averages 1°C (33°F), cold enough that sightseeing works in bursts rather than in one long day on foot.
At 159 mm of water-equivalent precipitation this is a snowy month at resort level — that is snowpack, not lost days — with almost no days with 6+ hours of sunshine and 8.1 hours of daylight.
It scores 2.2/10 here, 10th of 12 months, against 7.7/10 in the destination's best month.
Plan for low-season pricing, with crowds are light for this destination.
Pack insulated layers, a windproof shell, gloves and boots with grip, a proper rain shell rather than an umbrella, footwear you can get muddy.
Flexible dates? July scores 5.5 points higher here — enough to change the trip.
March in Blue Lagoon: expect compromises
Hardest · 3.3/10At 1°C (34°F) this is proper winter weather in March: layer up and split the day between outdoor highlights and indoor stops.
118 mm of water-equivalent precipitation makes this a snowy month at resort level; what falls stays as snow, with almost no days with 6+ hours of sunshine and 11.2 hours of daylight.
That is 3.3/10 on the same scale — 8th of 12 months, versus 7.7/10 for the best month here.
Budget for low-season pricing, and crowds are light for this destination.
Pack insulated layers, a windproof shell, gloves and boots with grip, a proper rain shell rather than an umbrella, footwear you can get muddy.
If your dates are flexible, July is materially better in Blue Lagoon — 4.4 points higher on the same scale.
April in Blue Lagoon — middling scores, decent value
Trade-offs · 5.3/10April averages 4°C (39°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
At 102 mm this is a genuinely wet month: about 8 days with 6+ hours of sunshine in total, and outdoor plans need an indoor fallback.
It scores 5.3/10 here, 5th of 12 months, against 7.7/10 in the destination's best month.
Figure on mid-season pricing, with crowds are moderate.
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.
Flexible dates? July scores 2.4 points higher here — enough to change the trip.
May in Blue Lagoon: mixed conditions, plan around the weather
Trade-offs · 6.2/10Expect 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.
Expect mid-season pricing, and crowds are moderate.
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.
If your dates are flexible, July is materially better in Blue Lagoon — 1.5 points higher on the same scale.
June in Blue Lagoon: strong conditions, 2nd of 12
Good · 7.3/10June averages 9°C (48°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
Rainfall runs 92 mm, so plan one flexible day in three; you still get about 18 days with 6+ hours of sunshine and 20.2 hours of daylight.
It scores 7.3/10 here, 2nd of 12 months, against 7.7/10 in the destination's best month.
Figure on mid-season pricing, with crowds are moderate.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a packable rain layer, footwear you can get muddy.
July in Blue Lagoon — the year's strongest window
Best window · 7.7/10July averages 11°C (51°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
Rainfall runs 81 mm, so plan one flexible day in three; you still get about 17 days with 6+ hours of sunshine and 19.1 hours of daylight.
On our climate-comfort scale this is the top-ranked month of the year for Blue Lagoon at 7.7/10 — the reference point every other month on this page is measured against.
Plan for peak pricing, with this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Pack a mid-weight jacket, long sleeves and shoes you can walk 15 km in, a packable rain layer, footwear you can get muddy.
August in Blue Lagoon — workable with trade-offs
Trade-offs · 6.5/10Expect 11°C (51°F) in August. A good month for city streets, viewpoints and long meals; leave swimming for another season.
116 mm of rain signals a properly wet month, with only about 10 days with 6+ hours of sunshine to count on — build indoor options into the schedule.
That is 6.5/10 on the same scale — 3rd of 12 months, versus 7.7/10 for the best month here.
Expect peak pricing, and this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
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.
September in Blue Lagoon: mixed conditions, plan around the weather
Trade-offs · 5/10Expect 8°C (47°F) in September. A good month for city streets, viewpoints and long meals; leave swimming for another season.
106 mm of rain signals a properly wet month, with only almost no days with 6+ hours of sunshine to count on — build indoor options into the schedule.
That is 5/10 on the same scale — 6th of 12 months, versus 7.7/10 for the best month here.
Budget for mid-season pricing, and crowds are moderate.
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.
If your dates are flexible, July is materially better in Blue Lagoon — 2.7 points higher on the same scale.
October in Blue Lagoon: expect compromises
Hardest · 3.6/10October averages 5°C (41°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
At 116 mm this is a genuinely wet month: almost no days with 6+ hours of sunshine in total, and outdoor plans need an indoor fallback.
It scores 3.6/10 here, 7th of 12 months, against 7.7/10 in the destination's best month.
Figure on low-season pricing, with crowds are light for this destination.
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.
Flexible dates? July scores 4.1 points higher here — enough to change the trip.
November in Blue Lagoon: expect compromises
Hardest · 2.9/10November averages 4°C (38°F), cold enough that sightseeing works in bursts rather than in one long day on foot.
Rainfall runs 96 mm, so plan one flexible day in three; you still get almost no days with 6+ hours of sunshine and 6 hours of daylight.
It scores 2.9/10 here, 9th of 12 months, against 7.7/10 in the destination's best month.
Plan for low-season pricing, with crowds are light for this destination.
Pack insulated layers, a windproof shell, gloves and boots with grip, a packable rain layer, footwear you can get muddy.
Flexible dates? July scores 4.8 points higher here — enough to change the trip.
December in Blue Lagoon — the hardest end of the year
Hardest · 1.8/10At 0°C (31°F) this is proper winter weather in December: layer up and split the day between outdoor highlights and indoor stops.
124 mm of water-equivalent precipitation makes this a snowy month at resort level; what falls stays as snow, with almost no days with 6+ hours of sunshine and 3.8 hours of daylight.
That is 1.8/10 on the same scale — 11th of 12 months, versus 7.7/10 for the best month here.
Budget for low-season pricing, and crowds are light for this destination.
Pack insulated layers, a windproof shell, gloves and boots with grip, a proper rain shell rather than an umbrella, footwear you can get muddy.
If your dates are flexible, July is materially better in Blue Lagoon — 5.9 points higher on the same scale.
