Weather in St. John's in August

A good month. August works. It is not the peak, but nothing about it fights you. You should expect rain on 15 days of the month, which is more days wet than dry.

August is the highest-scoring month of the twelve. The nearest rival is July, and the month at the other end of the year is January.

This is persistent light rain rather than storms: 15 wet days but only 2 heavy ones. It rarely cancels anything outright, and it rarely fully clears either. A jacket beats an umbrella. Pack for 17.4 °C days and 14 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: the day barely swings — 3.4 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest August day reached 24.1 °C and the coldest night fell to 7.7 °C, and the wettest single day dropped 42 mm — roughly 47% of the month's rain in one day.

August is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest August on record still delivered 125 mm against 46 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 90 mm average is a reasonable planning figure, not a promise.

Wind is light at 14.2 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 88%, high enough to notice on the warm days without dominating them.

How August sits in the year

This is a turning point in the year — July and September sit on opposite sides of it, so the month contains the change rather than following it.

Daylight in August

14.3 hours of daylight, losing 1.5 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 14.2 °C in August — cold — a quick dip rather than a swim, and a wetsuit if you are in for longer. This is the warmest the water gets all year.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead.

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

August 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 August — 5 °C warmer, 2 days less rain. Halifax is a better bet in August — 3.7 °C warmer, 3 days less rain.

So: August is the answer for St. John's. If it is booked out or priced out, July is the next best thing at 7 points behind, and January is the month to keep off the shortlist.

Every month in St. John's

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