Tal-y-llyn Temperature by Month

Tal-y-llyn, Gwynedd, United Kingdom has an average annual maximum temperature of 13°C (55°F), ranging from 8°C (46°F) in January to 19°C (66°F) in July. Below you'll find a full monthly breakdown and a comparison with cities worldwide.

Visitors to Tal-y-llyn can expect significant temperature changes throughout the year. Nighttime temperatures also vary widely, ranging from 12°C (54°F) in July to 3°C (37°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Tal-y-llyn 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. July, the city's warmest month, averages 155 hours of sunshine.

The chart below shows the average temperature throughout the year:

Tal-y-llyn'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:

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.

New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.

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 Tal-y-llyn this rarely lasts long on the ground.

For more on Tal-y-llyn's weather, including monthly rainfall, sunshine hours, and humidity, visit our Tal-y-llyn climate page.