Weather in St. John's in March

The month to avoid. Of the twelve, March is the one to avoid. Highs sit at 0.1 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

March ranks 11 of 12 — near the bottom of St. John's's year. August is the month that works, and the swing between the two is 55 points, which is a different holiday rather than a slightly better one.

Rain on 17 days, 4 of them heavy. Enough to need a plan B, not enough to need a plan around it. Layers, and a genuinely waterproof outer — at 0.1 °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: 29 nights drop below freezing, so anything left outside stays frozen; the day barely swings — 3.4 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest March day reached 6.6 °C and the coldest night fell to -13.9 °C, and the wettest single day dropped 31 mm — roughly 26% 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 184 mm against 71 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 117 mm average is a reasonable planning figure, not a promise.

Wind sits around 21.2 km/h — a steady breeze rather than a nuisance, and welcome on the warmer days, and humidity runs at 87%, which at 0.1 °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: -0.6 °C in February, 0.1 here, 2.8 in April. Nothing about the timing within the month matters much.

Daylight in March

11.8 hours of daylight, gaining 1.7 hours across the month. That is between St. John's's extremes of 15.9 and 8.5 hours, so days are long enough not to constrain the plan.

Sea temperature

The sea sits at about -1 °C in March — too cold to swim without a wetsuit. The sea peaks at 14.2 °C in August and bottoms out at -1 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

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.

March in St. John's versus nearby

If St. John's is one option among several, the nearby comparison is worth making. Sydney is close enough to be a coin toss — within a degree on temperature, 4 days less rain. Halifax is a better bet in March — 2.3 °C warmer, 5 days less rain.

So: March is a compromise. August is 53 points better and is what St. John's 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 St. John's

See all twelve months in St. John's, or where else to go in March.