Saint John weather by month & the best time to visit
Canada · seaside town · continental climate
The best time to visit Saint John is August — its sunniest month (Sunshine Score 74/100), with July close behind. Saint John averages about 1,943 hours of sunshine a year. Daytime highs around 22°C / 72°F and roughly 85 mm of rain in August.
When is the best time to visit Saint John?
For sunshine, the best time to visit Saint John is August, then July. The dullest month is January (0/100, 94 mm of rain). The full month-by-month picture is in the table below.
How sunny is Saint John?
Saint John gets a moderate 1,943 hours of sunshine a year. 74 Sunshine Score points separate August (74) from January (0), so the month you pick matters. It ranks #154 of 242 destinations in Canada for annual sunshine, below the national median of 2,024 hours. The year's 1,243 mm of rain spreads fairly evenly across the months, with no pronounced dry season.
Sunshine Score by month
| Month | Score | Day high | Night low | Rain | UV | Sea |
|---|---|---|---|---|---|---|
| January | 0 | -3° / 27°F | -12° / 10°F | 94 mm | 1 | 3° / 37°F |
| February | 0 | -2° / 28°F | -11° / 12°F | 93 mm | 1 | 2° / 36°F |
| March | 0 | 2° / 36°F | -6° / 21°F | 91 mm | 3 | 3° / 37°F |
| April | 0 | 8° / 46°F | -1° / 30°F | 95 mm | 4 | 6° / 43°F |
| May | 36 | 14° / 57°F | 5° / 41°F | 98 mm | 5 | 11° / 52°F |
| June | 58 | 18° / 64°F | 10° / 50°F | 110 mm | 6 | 15° / 59°F |
| July | 73 | 22° / 72°F | 13° / 55°F | 91 mm | 6 | 18° / 64°F |
| August | 74 | 22° / 72°F | 13° / 55°F | 85 mm | 6 | 19° / 66°F |
| September | 59 | 18° / 64°F | 10° / 50°F | 102 mm | 4 | 17° / 63°F |
| October | 22 | 12° / 54°F | 5° / 41°F | 124 mm | 2 | 13° / 55°F |
| November | 0 | 6° / 43°F | -1° / 30°F | 127 mm | 1 | 9° / 48°F |
| December | 0 | 0° / 32°F | -7° / 19°F | 133 mm | 1 | 4° / 39°F |
Sea temperature in Saint John by month
The sea off Saint John is warmest in August at around 19°C / 66°F, and coolest in February at 2°C / 36°F. It never reaches comfortable swimming temperatures (21°C+). Month-by-month sea-surface temperatures are in the Sea column of the table above.
Nearest destinations
Saint John: questions and answers
What kind of destination is Saint John?
Saint John is a seaside town in Canada with a continental climate — the sea reaches 19°C at its warmest.
How many hours of sunshine does Saint John get a year?
Saint John gets about 1,943 hours of sunshine a year, at its best around August.
When is the best time to visit Saint John?
The sunniest time to visit Saint John is August, when the Sunshine Score peaks at 74/100 (with July close behind). Expect daytime highs around 22°C / 72°F.
What is the least sunny month in Saint John?
January is the least sunny month in Saint John, scoring 0/100 with about 94 mm of rain.
What is the sea temperature in Saint John?
The sea in Saint John ranges from about 2°C (February) to 19°C (August). Month-by-month sea temperatures are on this page.
How strong is the sun in Saint John?
The typical midday UV index in Saint John peaks around 6 (high) in June, easing to about 1 (low) in January. Month-by-month midday UV values are in the UV column of the table on this page.
Put the Saint John sunshine badge on your site
A compact badge showing Saint John's sunshine at a glance — free to embed under CC BY 4.0. Paste this wherever you'd like it to appear:
Live preview — this is exactly what your readers see: