Iceland Airwaves Festival
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October in Mosfellsbær averages 8°C (46°F) during the day and 2°C (36°F) at night. Quite a bit of rainfall is typical this month, with around 125 mm (4.9 in) on average. An umbrella is a good idea.
October in Mosfellsbær has its charm. However, if you're seeking pleasant, dry and sunny weather, our weather planner can help you explore other destinations in the world.
Pick a month to see the average temperature, rainfall and sunshine in Mosfellsbær - and find the best time to visit.
50-year average (1976-2025)
Based on our historical records, temperatures in Mosfellsbær typically drop from around 9°C (48°F) at the start of October to approximately 6°C (43°F) by the end. Nights are cold, with lows typically ranging from 1°C (34°F) to 5°C (41°F).
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
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.
Based on weather observations in Mosfellsbær between 1976 and 2025, these are the recorded extremes during October.
Find out more about the weather in Iceland and which places have the best travel conditions in this month. See all of Iceland in October →
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).
We recommend to layer up for chilly conditions in Mosfellsbær in October. You could start with thermal underwear or a good base layer to keep your core warm on the cooler days this month. Maybe also add a sweater or fleece, and top it off with a windproof jacket. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Expect water temperatures of around 9°C (48°F), which is definitely too cold for comfortable swimming. Your luggage space is better used for other items. With limited sunshine expected, sunglasses aren't a priority for packing.
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Mosfellsbær climate overview or explore weather in Iceland.
Where to go in October - average daytime high across popular destinations.
Need travel inspiration? Check out our bucket list articles and be inspired.
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