Best time to visit Saint John
Month-by-month weather averages for Saint John.
Saint John, New Brunswick, Canada
°C
mm
- Average daily high and low
- Precipitation
- Good month
- Best month
- Made good or best by an event
| Month | Average daily high | Average daily low | Precipitation | Verdict |
|---|---|---|---|---|
| January | -0.7 °C / 31 °F | -7.5 °C / 19 °F | 116 mm / 4.6 in | neither best nor good |
| February | -0.7 °C / 31 °F | -7.6 °C / 18 °F | 106 mm / 4.2 in | neither best nor good |
| March | 2.5 °C / 37 °F | -3.4 °C / 26 °F | 106 mm / 4.2 in | neither best nor good |
| April | 6.9 °C / 44 °F | 2.1 °C / 36 °F | 111 mm / 4.4 in | neither best nor good |
| May | 11.6 °C / 53 °F | 6.8 °C / 44 °F | 100 mm / 3.9 in | neither best nor good |
| June | 15.6 °C / 60 °F | 11.1 °C / 52 °F | 120 mm / 4.7 in | good month |
| July | 18.8 °C / 66 °F | 14.6 °C / 58 °F | 102 mm / 4 in | good month |
| August | 19.2 °C / 67 °F | 15 °C / 59 °F | 96 mm / 3.8 in | good month |
| September | 16.9 °C / 62 °F | 12.6 °C / 55 °F | 98 mm / 3.9 in | good month |
| October | 12.7 °C / 55 °F | 8.2 °C / 47 °F | 129 mm / 5.1 in | neither best nor good |
| November | 7.3 °C / 45 °F | 2.4 °C / 36 °F | 134 mm / 5.3 in | neither best nor good |
| December | 2.4 °C / 36 °F | -3.5 °C / 26 °F | 153 mm / 6 in | neither best nor good |
Good and best months depend on more than temperature, rain and events. How they are chosen
Each activity on this page has its own good and best months, rated on twenty years of daily weather records. Which measures count, and how much, depends on the activity: humidity for exploring outdoors, wind for the beach, hiking and skiing, snow for skiing alone. Between them, the activities are rated on:
- Daytime highs
- Night-time lows
- How warm it feels
- Humidity
- How much of the day is sunny
- Hours of daylight
- Monthly rainfall
- How many days it rains
- Days of heavy rain
- Wind
- Snowfall and days with snow
- Major events, such as festivals
The chart shows the good and best months for exploring outdoors.
The event icon marks a month that an event lifts to good or best, such as a festival or a natural spectacle. Choose “Weather only” in the toolbar to rate the months on weather alone.
Best months by activity
Exploring outdoors
Mild days and nights, mostly dry and bright. The default for 'when should I go'.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: neither
- MMay: neither
- JJune: good
- JJuly: good
- AAugust: good
- SSeptember: good
- OOctober: neither
- NNovember: neither
- DDecember: neither
- Good
- June–September
Why these months
June · good
In its favour: feels like (high) 14.6 °C / 58 °F, share of daylight that is sunny 64%, average daily high 15.6 °C / 60 °F, precipitation 120 mm / 4.7 in, average daily low 11.1 °C / 52 °F, days with heavy rain 4.3 days.
Against: relative humidity 84%, wet days 12.6 days.
July · good
In its favour: feels like (high) 19.2 °C / 67 °F, average daily high 18.8 °C / 66 °F, share of daylight that is sunny 71%, precipitation 102 mm / 4 in, days with heavy rain 3.1 days, average daily low 14.6 °C / 58 °F, wet days 11.7 days.
Against: relative humidity 87%.
August · good
In its favour: feels like (high) 19.6 °C / 67 °F, average daily high 19.2 °C / 67 °F, share of daylight that is sunny 73%, precipitation 96 mm / 3.8 in, wet days 9.6 days, days with heavy rain 3.1 days, average daily low 15 °C / 59 °F.
Against: relative humidity 86%.
September · good
In its favour: feels like (high) 16 °C / 61 °F, share of daylight that is sunny 72%, average daily high 16.9 °C / 62 °F, precipitation 98 mm / 3.9 in, wet days 9.1 days, days with heavy rain 3 days, average daily low 12.6 °C / 55 °F.
Against: relative humidity 84%.
Hiking and trekking
Cool enough to climb in, dry enough to enjoy, long enough days.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: neither
- MMay: best
- JJune: good
- JJuly: best
- AAugust: best
- SSeptember: best
- OOctober: good
- NNovember: neither
- DDecember: neither
- Best
- May, July–September
- Good
- June, October
Why these months
May · best
In its favour: average daily high 11.6 °C / 53 °F, precipitation 100 mm / 3.9 in, average daily low 6.8 °C / 44 °F, share of daylight that is sunny 65%, daylight per day 14.9 h, feels like (high) 9.3 °C / 49 °F, days with heavy rain 3.3 days, wet days 12.2 days, wind (daily max) 23 km/h / 14 mph.
June · good
In its favour: average daily high 15.6 °C / 60 °F, precipitation 120 mm / 4.7 in, feels like (high) 14.6 °C / 58 °F, average daily low 11.1 °C / 52 °F, share of daylight that is sunny 64%, daylight per day 15.6 h, wind (daily max) 22 km/h / 13 mph.
Against: days with heavy rain 4.3 days, wet days 12.6 days.
July · best
In its favour: average daily high 18.8 °C / 66 °F, precipitation 102 mm / 4 in, feels like (high) 19.2 °C / 67 °F, share of daylight that is sunny 71%, daylight per day 15.2 h, average daily low 14.6 °C / 58 °F, days with heavy rain 3.1 days, wet days 11.7 days, wind (daily max) 21 km/h / 13 mph.
August · best
In its favour: average daily high 19.2 °C / 67 °F, precipitation 96 mm / 3.8 in, wet days 9.6 days, feels like (high) 19.6 °C / 67 °F, share of daylight that is sunny 73%, daylight per day 14 h, days with heavy rain 3.1 days, average daily low 15 °C / 59 °F, wind (daily max) 20 km/h / 12 mph.
September · best
In its favour: average daily high 16.9 °C / 62 °F, precipitation 98 mm / 3.9 in, wet days 9.1 days, feels like (high) 16 °C / 61 °F, average daily low 12.6 °C / 55 °F, share of daylight that is sunny 72%, daylight per day 12.5 h, days with heavy rain 3 days, wind (daily max) 23 km/h / 14 mph.
October · good
In its favour: average daily high 12.7 °C / 55 °F, average daily low 8.2 °C / 47 °F, share of daylight that is sunny 67%, precipitation 129 mm / 5.1 in, feels like (high) 9.7 °C / 49 °F, wet days 11.2 days, daylight per day 10.9 h, wind (daily max) 26 km/h / 16 mph.
Against: days with heavy rain 4.6 days.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is Sugarloaf, 333 km away.
Weather averages
Monthly averages over twenty years, 2006–2025. Highs, lows and precipitation are in the chart at the top.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels like (high) | -6.4 °C | -6.3 °C | -2.5 °C | 3.1 °C | 9.3 °C | 14.6 °C | 19.2 °C | 19.6 °C | 16 °C | 9.7 °C | 3 °C | -2.9 °C |
| Days with heavy rain | 4.1 days | 3.6 days | 3.8 days | 4.2 days | 3.3 days | 4.3 days | 3.1 days | 3.1 days | 3 days | 4.6 days | 4.5 days | 5.8 days |
| Time rain usually falls | 6 pm | 2 am | 6 pm | 1 pm | 2 pm | 3 pm | 6 am | 8 am | 11 am | 1 pm | 11 pm | 2 am |
| Sunshine per day | 5.8 h | 7.1 h | 8.1 h | 8.8 h | 9.6 h | 10 h | 10.8 h | 10.3 h | 9 h | 7.3 h | 5.8 h | 5.1 h |
| Relative humidity | 76% | 74% | 72% | 75% | 80% | 84% | 87% | 86% | 84% | 79% | 77% | 78% |
Air quality
Averaged over a shorter period (2022–2025) than the twenty-year averages above, and not counted towards good or best months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air pollution (PM2.5) 2022–2025 | 3 µg/m³ | 4.5 µg/m³ | 5.6 µg/m³ | 7.6 µg/m³ | 7.6 µg/m³ | 11.2 µg/m³ | 8.8 µg/m³ | 9.4 µg/m³ | 7.8 µg/m³ | 5.5 µg/m³ | 3.6 µg/m³ | 3 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 5.9 µg/m³ | 7.8 µg/m³ | 9.9 µg/m³ | 12.9 µg/m³ | 12.9 µg/m³ | 18.2 µg/m³ | 14.1 µg/m³ | 15.2 µg/m³ | 12.7 µg/m³ | 9.2 µg/m³ | 6.8 µg/m³ | 5.2 µg/m³ |
- Good 15 µg/m³ or less
- Fair 15 to 25 µg/m³
- Moderate 25 to 37.5 µg/m³
- Poor 37.5 to 50 µg/m³
- Very poor 50 to 75 µg/m³
- Extremely poor over 75 µg/m³
Each figure is compared with the World Health Organization's guideline for a day's air, 15 µg/m³ or less, and with its interim targets above that. The words are ours: the WHO does not name its steps. The figures are modelled monthly averages, so single days can be well above them. The daily peak is the average of each day's highest hour, shaded on the same scale.