Port William Temperature by Month

The average annual maximum temperature in Port William, Dumfries and Galloway, United Kingdom is 13°C (55°F), with daytime highs ranging from 9°C (48°F) in February to 17°C (63°F) in August. This page covers monthly averages, day-night differences, and how Port William compares to cities worldwide.

The moderate changes in the climate in Port William ensure gradual weather shifts through each season. At night, temperatures drop to between 13°C (55°F) and 5°C (41°F) depending on the time of year.

The chart below illustrates the average maximum day and minimum night temperatures in Port William 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:

Port William'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:

Lisbon, Portugal averages 21°C (70°F) annually, warm summers, mild winters, and rain mainly in the cooler months.

Zermatt, Switzerland averages just 4°C (39°F) annually due to its altitude, with very cold winters and cool summers even at its warmest.

Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.

Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.

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 Port William this rarely lasts long on the ground.

For more on Port William's weather, including monthly rainfall, sunshine hours, and humidity, visit our Port William climate page.