Caernarfon

What is the climate like in Caernarfon?

The best time to visit Caernarfon is typically July, the year's most comfortable month (6.0/10). Caernarfon is warmest in July, when daily highs average 66°F (19°C), and coolest in January, when lows fall to about 39°F (4°C). The wettest month is typically December and the driest is May; the year sees roughly 45 in (1150 mm) of precipitation.

• Best time to visitJuly — the year's comfort peak (6.0/10)
• Warmest monthJuly — average high 66°F (19°C)
• Coolest monthJanuary — average low 39°F (4°C)
• Wettest monthDecember (4.7 in (119 mm))
• Driest monthMay (2.6 in (67 mm))
• Annual precipitation45 in (1150 mm)
• Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
• Records fromValley, 21 km away (1930-2026)