January in Selfoss — the hardest end of the year
Hardest · 1/10January averages -2°C (28°F), cold enough that sightseeing works in bursts rather than in one long day on foot.
At 187 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 1/10 here, 12th of 12 months, against 6.9/10 in the destination's best month.
Figure on 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.
Flexible dates? July scores 5.9 points higher here — enough to change the trip.
February in Selfoss — the hardest end of the year
Hardest · 1.5/10February averages -2°C (29°F), cold enough that sightseeing works in bursts rather than in one long day on foot.
At 172 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 hours of daylight.
It scores 1.5/10 here, 10th of 12 months, against 6.9/10 in the destination's best month.
Figure on 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.
Flexible dates? July scores 5.4 points higher here — enough to change the trip.
March in Selfoss: expect compromises
Hardest · 2.4/10At -1°C (31°F) this is proper winter weather in March: layer up and split the day between outdoor highlights and indoor stops.
149 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 2.4/10 on the same scale — 9th of 12 months, versus 6.9/10 for the best month here.
Expect 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.
If your dates are flexible, July is materially better in Selfoss — 4.5 points higher on the same scale.
April in Selfoss — the hardest end of the year
Hardest · 4.7/10April averages 3°C (38°F), cold enough that sightseeing works in bursts rather than in one long day on foot.
At 103 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 4.7/10 here, 5th of 12 months, against 6.9/10 in the destination's best month.
Plan for mid-season pricing, with crowds are moderate.
Pack insulated layers, a windproof shell, gloves and boots with grip, a proper rain shell rather than an umbrella.
Flexible dates? July scores 2.2 points higher here — enough to change the trip.
May in Selfoss: mixed conditions, plan around the weather
Trade-offs · 5.1/10Expect 7°C (44°F) in May. A good month for city streets, viewpoints and long meals; leave swimming for another season.
144 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 5.1/10 on the same scale — 4th of 12 months, versus 6.9/10 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.
If your dates are flexible, July is materially better in Selfoss — 1.8 points higher on the same scale.
June in Selfoss — middling scores, decent value
Trade-offs · 6.4/10June averages 9°C (48°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
At 111 mm this is a genuinely wet month: about 18 days with 6+ hours of sunshine in total, and outdoor plans need an indoor fallback.
It scores 6.4/10 here, 2nd of 12 months, against 6.9/10 in the destination's best month.
Plan for 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.
July: the best month of the year in Selfoss
Best window · 6.9/10July averages 11°C (52°F) — jacket weather. Comfortable for walking and museums, too cool for anything water-based.
Rainfall runs 96 mm, so plan one flexible day in three; you still get about 17 days with 6+ hours of sunshine and 19.2 hours of daylight.
On our climate-comfort scale this is the top-ranked month of the year for Selfoss at 6.9/10 — the reference point every other month on this page is measured against.
Figure on 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.
August in Selfoss — middling scores, decent value
Trade-offs · 5.7/10Expect 10°C (50°F) in August. A good month for city streets, viewpoints and long meals; leave swimming for another season.
128 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 5.7/10 on the same scale — 3rd of 12 months, versus 6.9/10 for the best month here.
Budget for 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.
September in Selfoss: expect compromises
Hardest · 4.2/10Expect 8°C (46°F) in September. A good month for city streets, viewpoints and long meals; leave swimming for another season.
140 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 4.2/10 on the same scale — 6th of 12 months, versus 6.9/10 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.
If your dates are flexible, July is materially better in Selfoss — 2.7 points higher on the same scale.
October in Selfoss: expect compromises
Hardest · 3.1/10October averages 3°C (38°F), cold enough that sightseeing works in bursts rather than in one long day on foot.
At 126 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 3.1/10 here, 7th of 12 months, against 6.9/10 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.
Flexible dates? July scores 3.8 points higher here — enough to change the trip.
November in Selfoss — off-season conditions
Hardest · 2.6/10November averages 1°C (34°F), cold enough that sightseeing works in bursts rather than in one long day on foot.
At 112 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 2.6/10 here, 8th of 12 months, against 6.9/10 in the destination's best month.
Figure on 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.
Flexible dates? July scores 4.3 points higher here — enough to change the trip.
December in Selfoss — the hardest end of the year
Hardest · 1.1/10At -4°C (26°F) this is proper winter weather in December: layer up and split the day between outdoor highlights and indoor stops.
137 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 1.1/10 on the same scale — 11th of 12 months, versus 6.9/10 for the best month here.
Expect 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.
If your dates are flexible, July is materially better in Selfoss — 5.8 points higher on the same scale.
