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Live forecasts update automatically; written guidance last reviewed 13 June 2026 by the Insight Britain weather desk. Data from national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Check the live forecast above for Caernarfon’s current conditions and hourly breakdown. This guide explains how to interpret that data, what to expect from the town’s maritime climate, and how local geography shapes your weather experience.
How do I read the live forecast for Caernarfon?
The live forecast above shows temperature, wind speed and direction, precipitation probability, and cloud cover for the hours ahead. Pay particular attention to the wind arrow – Caernarfon’s position on the Menai Strait means gusts can strengthen suddenly. The rain percentage gives a reliable indication of whether showers are likely, especially useful when planning walks on Snowdonia’s lower slopes.
What is Caernarfon’s typical climate through the seasons?
Caernarfon has a temperate maritime climate, mild and wet year‑round. Winters are cool, typically 2–8°C, with frequent cloud and rain, driven by Atlantic weather systems. Spring sees gradual warming, 5–14°C, and more settled spells, though April showers remain common. Summers are mild to warm, 12–20°C, with the highest sunshine hours in June and July – but rain can still arrive at any time. Autumn turns cooler, 7–15°C, with increasing wind and the most intense rainfall from October onward.
How does local geography affect Caernarfon’s weather?
Caernarfon sits on the southern shore of the Menai Strait, sheltered to some extent by the Llŷn Peninsula and Anglesey. However, the close proximity of Snowdonia to the east creates a rain shadow effect: moist air rising over the mountains often produces heavy precipitation on the peaks while Caernarfon itself receives slightly less. The Strait can funnel winds, making conditions feel breezier than inland areas. The urban layout offers some protection, but exposed spots by the castle or waterfront are noticeably windier.
When is the best time to visit Caernarfon and what should I pack?
Late spring (May to June) and early autumn (September) offer the best balance of milder temperatures, lower rainfall and fewer crowds. Pack waterproof layers and a wind‑resistant jacket regardless of season – sudden showers are always possible. Sturdy footwear is advisable for exploring the castle grounds and Snowdonia paths.
What nearby areas do readers also check?
Beyond Caernarfon, users often view forecasts for Anglesey, Porthmadog, Pwllheli, Holyhead and Conwy. The Snowdonia page is particularly useful for hill walkers needing summit conditions.
What will the weather be in Caernarfon tomorrow?
Refer to the live forecast above and look at the ‘Tomorrow’ tab. The widget provides a detailed hour‑by‑hour view of temperature, rain chance and wind. Across the year, expect a 40–60% chance of at least some rain tomorrow, with conditions often changing markedly from morning to evening.
What is the 10‑ to 14‑day outlook for Caernarfon?
The live forecast above includes a 10‑day overview. Beyond that, long‑range models are uncertain in this part of the UK. A typical outlook for Caernarfon would see Atlantic lows bringing spells of rain and wind interspersed with brief drier, brighter interludes. Always check the latest 10‑day forecast before making plans.
Does it rain a lot in Caernarfon?
Yes – Caernarfon receives around 1,100 mm of rain annually, higher than the UK average (~800 mm). Rain is spread throughout the year, with October to January the wettest months. However, the town is slightly drier than nearby Snowdonia peaks because of the rain shadow effect. A waterproof jacket is essential for any visit.
Is Caernarfon very windy?
The town can be noticeably windy, especially near the Menai Strait and the castle. Gales are most common from December to February, but fresh breezes occur year‑round. Always consult the live forecast above for wind speed and direction, particularly if heading onto exposed coastal paths or up Snowdonia.
For a national overview, see the UK weather hub or browse all UK towns A–Z. Check the UK weather warnings page for any current alerts affecting North Wales.