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Selfoss Weather in August
In Selfoss, August brings moderate daytime temperatures around 15°C (59°F), with nights cooling to 9°C (48°F). Expect quite a bit of rainfall this month.
Rainfall in Selfoss in August
This month experiences about 18 days of rain according to historical data, averaging 124 mm (4.9 in). Wet weather is a regular and significant part of this month. Frequent days of rain combined with high totals means proper waterproofs are worth packing.
Temperature in Selfoss in August
Temperatures in Selfoss in August top out at 15°C (59°F) and drop to 9°C (48°F) overnight. August is part of summer. The difference between afternoon and evening temperatures is usually noticeable. Nights fall to 9°C (48°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.
Sunshine in Selfoss in August
The city usually sees around 154 hours of sunlight, indicating a moderately sunny period.If your ideal day consists of dry skies and pleasant temperatures, June and July typically offer the best circumstances for Selfoss.
Selfoss Temperature in August
Min Temperature
9°C (48°F)
Max Temperature
15°C (59°F)
Chance of Rain
60%
Precipitation
124 mm (4.9 in)
Rainy days
18 days
Humidity
81% *
Sunshine
154 hours *
Percentage Sunshine
31% *
* 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 stay consistent throughout August, with daily highs averaging around 15°C (59°F). Nights are cool, with lows around 8°C (46°F).
Average temperatures in August
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 August
Historical weather records for Selfoss in August
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 August
Based on 50 years of weather observations in Selfoss between 1976 and 2026, these are the recorded extremes.
- The hottest August day on record in Selfoss reached 25°C (77°F) (August 11, 2004).
- On August 27, 1992, Selfoss saw its coldest August day with temperatures maxing out at 7°C (45°F).
- The coldest night in August in Selfoss was on August 26, 2024, with a minimum of 0°C (32°F).
- The wettest August day on record brought 40 mm (1.6 in) of precipitation to Selfoss (August 31, 2014).
Best Places in Iceland in August
Find out more about the weather in Iceland and which places have the best travel conditions in this month. See all of Iceland in August →
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 August
The weather can be unpredictable in August, so pack clothes you can easily mix and match. You could bring jeans, other long pants, and a few t-shirts. A light jacket or light sweater will be pleasant for the cooler moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Bring sunglasses since you'll have some sunny periods throughout the month
What To Do in Selfoss in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming5/10 -
Cycling5/10 -
Walking5/10 -
Camping3/10 -
Outdoor sports9/10
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 August
Where to go in August - average daytime high across popular destinations.
Hella
16°C (61°F) Selfoss15°C (59°F) Reykjavík15°C (59°F) Kópavogur15°C (59°F) Egilsstadir
13°C (55°F) Keflavík13°C (55°F) Höfn
12°C (54°F) Akureyri13°C (55°F) Bucket list
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