Stornoway Temperature by Month
The average annual maximum temperature in Stornoway, Isle of Lewis, United Kingdom is 13°C (55°F), with daytime highs ranging from 9°C (48°F) in January to 17°C (63°F) in August. This page covers monthly averages, day-night differences, and how Stornoway compares to cities worldwide.
Stornoway Monthly Temperatures
The weather in Stornoway changes moderately throughout the year, offering enough variation to appreciate each season. Nights are cooler, with lows ranging from 12°C (54°F) to 4°C (39°F).
The chart below illustrates the average maximum day and minimum night temperatures in Stornoway by month:
Daily lows are most common between 4 AM and 6 AM. By 3 PM temperatures reach their daily high, driven by peak solar heating. August, the warmest month of the year, receives 129 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Stornoway vs the United Kingdom
The map below shows the annual temperature across the United Kingdom. You can also select individual months if you want to compare a specific time of year.
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Stornoway vs World: Temperature Compared
Stornoway's average annual maximum temperature is 13°C (55°F). To put that in context, here's how it compares to a few well-known destinations:
Seville, Spain averages 23°C (73°F) a year — one of the warmer cities in Western Europe, with long hot summers.
On the cooler end, Oslo, Norway averages just 10°C (50°F) annually, with pleasant summers but long, cold winters.
Buenos Aires, Argentina averages 23°C (73°F) a year, with hot summers and mild winters — and seasons reversed compared to 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.
For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained — so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.
For more on Stornoway's weather — including monthly rainfall, sunshine hours, and humidity — visit our Stornoway climate page.
