Seyðisfjörður Temperature by Month
Seyðisfjörður in East Iceland, Iceland sees significant seasonal temperature differences, with daytime highs between 1°C (34°F) in December and 14°C (57°F) in July, averaging 6°C (43°F) annually. Explore the full monthly breakdown below.
Seyðisfjörður Monthly Temperatures
With significant temperature fluctuations, Seyðisfjörður enjoys distinct seasons year-round. Nighttime lows range from 7°C (45°F) in July to -6°C (21°F) in December.
The chart below illustrates the average maximum day and minimum night temperatures in Seyðisfjörður by month:
The coolest part of the day is typically between 4 AM and 6 AM, while 3 PM is usually the warmest, when solar heating is at its peak.
The chart below shows the average temperature throughout the year:
Daily Historical Temperatures
50-year average (1976-2025)
Average high and low temperatures for each day of the month based on long-term records.
Average temperatures in June
Historical Seyðisfjörður Temperatures: 1976-2026
Browse day-by-day temperature records for Seyðisfjörður spanning 51 years. Select any month and year to see actual high and low temperatures recorded on each day.
Temperature: Seyðisfjörður vs Iceland
The map below shows the annual temperature across Iceland. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
Seyðisfjörður vs World: Temperature Compared
Seyðisfjörður's average annual maximum temperature is 6°C (43°F). To put that in context, here's how it compares to a few well-known destinations:
Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.
Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.
Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.
Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
Global average temperatures have risen by around 1.2°C since the pre-industrial era, and the effects are visible across many regions. Winters are milder on average, with fewer frost days and less snow in many parts of the world. Heatwaves are more frequent and more intense, and Europe's summers of 2018, 2019, and 2020 all set records.
Summers are also getting drier in some areas, while winter rainfall has increased in others. This contributies to higher river levels and more flooding. In many countries, spring arrives earlier and autumn lasts longer. It has knock-on effects for wildlife, agriculture, and local ecosystems.
For more on Seyðisfjörður's weather — including monthly rainfall, sunshine hours, and humidity — visit our Seyðisfjörður climate page.
