Weather in Swansea in March

A hard month. March is a hard month in Swansea, and worth planning around. Highs sit at 9.4 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

March ranks 8 of 12 in Swansea: past the worst of the year but short of July, which is the month to book if the dates are open.

This is persistent light rain rather than storms: 14 wet days but only 2 heavy ones. It rarely cancels anything outright, and it rarely fully clears either. A jacket beats an umbrella. Layers, and a genuinely waterproof outer — at 9.4 °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 — 4.6 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest March day reached 16.8 °C and the coldest night fell to -4.1 °C, and the wettest single day dropped 25 mm — roughly 31% of the month's rain in one day.

March is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest March on record still delivered 137 mm against 24 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 80 mm average is a reasonable planning figure, not a promise.

Wind sits around 16.6 km/h — a steady breeze rather than a nuisance, and welcome on the warmer days, and humidity runs at 88%, which at 9.4 °C means damp rather than muggy — the kind of cold that gets into a coat and stays there.

How March sits in the year

Temperatures hold steady either side: 7.9 °C in February, 9.4 here, 12.1 in April. Nothing about the timing within the month matters much.

Daylight in March

11.8 hours of daylight, gaining 2 hours across the month. That is between Swansea's extremes of 16.6 and 7.9 hours, so days are long enough not to constrain the plan.

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

Quiet. Few other visitors, cheaper rooms, and a real chance some seasonal operators are shut.

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

March 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 — within a degree on temperature, 2 days less rain. Manchester is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: March is a compromise. July is 29 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 March.