Weather in St. John's in October

A hard month. October is a hard month in St. John's, and worth planning around. Highs sit at 10.2 °C and the day is short; this is an indoors-with-excursions month, not an outdoors-all-day one.

October ranks 5 of 12 in St. John's: past the worst of the year but short of August, which is the month to book if the dates are open.

Rain on 18 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 10.2 °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 — 3.1 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest October day reached 17.5 °C and the coldest night fell to -0.9 °C, and the wettest single day dropped 53 mm — roughly 40% of the month's rain in one day.

October is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest October on record still delivered 227 mm against 47 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 131 mm average is a reasonable planning figure, not a promise.

Wind sits around 18.6 km/h — a steady breeze rather than a nuisance, and welcome on the warmer days, and humidity runs at 87%, which at 10.2 °C means damp rather than muggy — the kind of cold that gets into a coat and stays there.

How October sits in the year

The month is on the way down: 4.6 °C cooler than September, with November dropping another 4.1 °C. The first week and the last are not the same trip.

Daylight in October

11 hours of daylight, losing 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 8.4 °C in October — 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

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.

October in St. John's versus nearby

If St. John's is one option among several, the nearby comparison is worth making. Sydney is a better bet in October — 3 °C warmer, 4 days less rain. Halifax is a better bet in October — 3.4 °C warmer, 6 days less rain.

So: October is a compromise. August is 31 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 October.