Mosfellsbær Weather in August
Thinking of visiting Mosfellsbær in August? Expect moderate temperatures reaching 15°C (59°F) during the day, dropping to 9°C (48°F) at night, and note that quite a bit of rainfall is likely.
Rainfall in Mosfellsbær in August
Rain is expected on roughly 18 days, totalling around 112 mm (4.4 in) for the month. This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.
Temperature in Mosfellsbær in August
Daytime temperatures in Mosfellsbær reach 15°C (59°F) in August, dropping to 9°C (48°F) at night. During August, you'll experience the summer season. The difference between afternoon and evening temperatures is usually noticeable. With overnight lows of 9°C (48°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.
Sunshine in Mosfellsbær in August
The area enjoys a balanced 154 hours of sunlight, ensuring it's neither too overcast nor too sunny.
Wind Speed in Mosfellsbær in August
August has wind speeds averaging 5 m/s (10 knots). You can expect gentle to moderate winds that move small trees and make flags wave steadily on typical days. Conditions typically range from light breezes to moderate winds.
Average water temperature in August
The water sits at 11°C (52°F) this month, which is well below what most people consider swimmable. Wetsuits help, but expect it to still feel cold.If your ideal day consists of dry skies and pleasant temperatures, June and July typically offer the best circumstances for Mosfellsbær.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Iceland, check out our Mosfellsbær's climate page.
Mosfellsbær Temperature in August
Min Temperature
9°C (48°F)
Max Temperature
15°C (59°F)
Water Temperature
11°C (52°F) *
Chance of Rain
59%
Precipitation
112 mm (4.4 in)
Rainy days
18 days
Humidity
81% *
Windspeed
5 m/s (10 knots) *
Sunshine
154 hours *
Percentage Sunshine
31% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Mosfellsbær typically stay consistent throughout August, with daily highs averaging around 15°C (59°F). Nights are cool, with lows typically ranging from 7°C (45°F) to 9°C (48°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 for Mosfellsbær in August
Browse day-by-day weather records for Mosfellsbær spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Mosfellsbær historical weather extremes in August
The extremes listed below come from historical weather data collected in Mosfellsbær from 1976 through 2025.
- The hottest August day on record in Mosfellsbær reached 25°C (77°F) (August 11, 2004).
- On August 27, 1992, Mosfellsbær saw its coldest August day with temperatures maxing out at 7°C (45°F).
- The lowest overnight temperature recorded in August was 1°C (34°F) (August 27, 1982).
- Peak precipitation in August occurred on August 31, 2014, when 48 mm (1.9 in) of precipitation was measured.
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
What to Wear in Mosfellsbær in August
Pack for changing conditions in Mosfellsbær in August. 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. The water temperature sits at about 11°C (52°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Mosfellsbær in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Iceland, check out our Mosfellsbær's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Mosfellsbær climate overview or explore weather in Iceland.
