Selsey Temperature by Month
The average annual maximum temperature in Selsey, West Sussex, United Kingdom is 14°C (57°F), with daytime highs ranging from 9°C (48°F) in February to 20°C (68°F) in August. This page covers monthly averages, day-night differences, and how Selsey compares to cities worldwide.
Selsey Monthly Temperatures
The climate in Selsey experiences moderate temperature changes, with mild shifts between seasons. At night, temperatures range from 16°C (61°F) in August to 5°C (41°F) in February.
The chart below illustrates the average maximum day and minimum night temperatures in Selsey by month:
Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM.
The chart below shows the average temperature throughout the year:
Temperature: Selsey 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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Selsey vs World: Temperature Compared
Selsey'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:
Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.
Glasgow, Scotland averages 13°C (55°F) a year — mild but often grey, with cold winters and rarely hot summers.
Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.
Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate — hot dry summers and mild wet winters.
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 Selsey this rarely lasts long on the ground.
For more on Selsey's weather — including monthly rainfall, sunshine hours, and humidity — visit our Selsey climate page.
