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Selfoss Weather in May
During May, Selfoss experiences low daytime temperatures of 11°C (52°F) and cooler nights around 5°C (41°F). Expect quite a bit of rainfall. Around 105 mm (4.1 in) is typical.
Rainfall in Selfoss in May
Typically, about 15 days will experience rainfall, with an average of 105 mm (4.1 in) for the month. Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.
Temperature in Selfoss in May
Daytime highs in Selfoss in May reach 11°C (52°F), with nights around 5°C (41°F). Expect a cold feel throughout the day, not just in the mornings and evenings. Warm layers are essential. 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 Selfoss in May
Expect sunny days throughout the month, with an estimated 201 hours of sunshine. Despite the cool temperatures, the sunny skies make it a pleasant time to visit Selfoss.Our weather planner can help you find worldwide destinations with pleasant weather during this period. June and July typically offer the best weather for Selfoss.
Selfoss Temperature in May
Min Temperature
5°C (41°F)
Max Temperature
11°C (52°F)
Chance of Rain
51%
Precipitation
105 mm (4.1 in)
Rainy days
15 days
Humidity
76% *
Sunshine
201 hours *
Percentage Sunshine
35% *
* Data from: Reykjavík, Iceland (48 KM, 30 Miles).
Selfoss Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Selfoss - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Selfoss 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 records for Selfoss in May
Browse day-by-day weather records for Selfoss spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Selfoss historical weather extremes in May
According to our 50 years of weather records for Selfoss, the following extremes were recorded between 1976 and 2026.
- Selfoss recorded its highest May temperature of 20°C (68°F) on May 15, 1988.
- Selfoss experienced its chilliest May day on May 3, 1982, reaching only -2°C (28°F).
- Nighttime temperatures dropped to -6°C (21°F) on May 5, 1982, marking the coldest May night on record.
- Peak precipitation in May occurred on May 21, 1988, when 61 mm (2.4 in) of precipitation was measured.
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
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Selfoss in May
Pack for changing conditions in Selfoss 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. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.
What To Do in Selfoss in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming4/10 -
Cycling5/10 -
Walking5/10 -
Camping3/10 -
Outdoor sports5/10
Selfoss 3-Day Forecast
More climate data for Selfoss
Temperature Rainfall Sunshine Humidity
See the full Selfoss climate overview or explore weather in Iceland.
Popular in May
Where to go in May - average daytime high across popular destinations.
Hella
12°C (54°F) Reykjavík
11°C (52°F) Kópavogur11°C (52°F) Selfoss11°C (52°F) Keflavík9°C (48°F) Höfn
8°C (46°F) Akureyri
6°C (43°F) Egilsstadir7°C (45°F) Bucket list
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