Weather in Swansea in January

The month to avoid. January is the month most people should skip in Swansea. Highs sit at 8 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

January ranks 12 of 12 — near the bottom of Swansea's year. July is the month that works, and the swing between the two is 41 points, which is a different holiday rather than a slightly better one.

Rain on 18 days, 3 of them heavy. Enough to need a plan B, not enough to need a plan around it. Layers, and a genuinely waterproof outer — at 8 °C the difference between a good day and a miserable one is entirely down to what you are wearing.

What the averages hide

Averages flatten a month, and this one hides a few things: the day barely swings — 3.2 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest January day reached 12.6 °C and the coldest night fell to -2.1 °C.

January is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest January on record still delivered 181 mm against 41 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 112 mm average is a reasonable planning figure, not a promise.

Wind sits around 19.1 km/h — a steady breeze rather than a nuisance, and welcome on the warmer days, and humidity runs at 91%, which at 8 °C means damp rather than muggy — the kind of cold that gets into a coat and stays there.

How January sits in the year

Temperatures hold steady either side: 8.9 °C in December, 8 here, 7.9 in February. Nothing about the timing within the month matters much.

Daylight in January

January sits at the dark end of Swansea's year — 8.3 hours of daylight against 16.6 at midsummer, gaining 1.1 hours across the month. Sightseeing days are genuinely shorter, and an itinerary built for summer will not fit.

An inland climate

Despite being inland, the year stays fairly even: 14.8 °C between the year's warmest afternoons and coldest nights.

How busy it gets

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

January in Swansea versus nearby

If Swansea is one option among several, the nearby comparison is worth making. Birmingham is close enough to be a coin toss — 2 °C cooler, 3 days less rain. Manchester is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: January is a compromise. July is 41 points better and is what Swansea is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Swansea

See all twelve months in Swansea, or where else to go in January.