St Martin Guernsey Temperature by Month

The average annual maximum temperature in St Martin Guernsey, Guernsey, United Kingdom is 14°C (57°F), with daytime highs ranging from 11°C (52°F) in February to 19°C (66°F) in August. This page covers monthly averages, day-night differences, and how St Martin Guernsey compares to cities worldwide.

In St Martin Guernsey, seasonal changes bring about a moderate variation in temperatures. Nighttime lows range from 16°C (61°F) in August to 7°C (45°F) in February.

The chart below illustrates the average maximum day and minimum night temperatures in St Martin Guernsey 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 232 hours of sunshine.

The chart below shows the average temperature throughout the year:

St Martin Guernsey's average annual maximum temperature is 14°C (57°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.

Queenstown, New Zealand averages 10°C (50°F) annually, remember seasons are flipped, so its coldest months fall in June and July.

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.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in St Martin Guernsey this rarely lasts long on the ground.

For more on St Martin Guernsey's weather, including monthly rainfall, sunshine hours, and humidity, visit our St Martin Guernsey climate page.