Climate averages 1991–2020
Saint John weather
in October.
A cool, wet month: the 6th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a cool month in Saint John: daytime highs average 12.3°C and nights cool to about 6.6°C. By daytime temperature it is the 6th warmest of the 12 months.
Expect about 133 mm of rain on roughly 11 days, which makes October a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 00 min on an average October day.
The nearest other city in this atlas is Moncton (134 km away). In October its highs average 12.6°C, about as warm as Saint John, with 98 mm of rain.
Among the 86 cities listed in Canada, Saint John ranks 66th of 86 for the warmest October highs and 74th of 86 for the driest October (rainfall, lowest first). The mean October high of those 86 cities is 12.7°C; Saint John is 0.4°C cooler than that mean.
From October to November, average highs fall by 5.6°C to 6.7°C, and monthly rainfall falls from 133 mm to 128 mm.
The annual picture
October in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Saint John climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -2.6°C-10.2°C | -10.2°C | 112 | 11.6 | 9.29 h |
| February | -1.7°C-9.1°C | -9.1°C | 96 | 10.3 | 10.410 h |
| March | 1.9°C-4.9°C | -4.9°C | 112 | 11.4 | 11.912 h |
| April | 7.4°C0.7°C | 0.7°C | 105 | 12.3 | 13.513 h |
| May | 13.4°C6.1°C | 6.1°C | 104 | 12.3 | 14.815 h |
| June | 17.8°C11.0°C | 11.0°C | 108 | 12.1 | 15.616 h |
| July | 20.8°C14.6°C | 14.6°C | 91 | 11.0 | 15.315 h |
| August | 21.0°C14.9°C | 14.9°C | 80 | 9.3 | 14.114 h |
| September | 17.8°C11.8°C | 11.8°C | 108 | 10.0 | 12.613 h |
| October, selected | 12.3°C6.6°C | 6.6°C | 133 | 10.9 | 11.011 h |
| November | 6.7°C1.0°C | 1.0°C | 128 | 11.8 | 9.610 h |
| December | 1.2°C-5.3°C | -5.3°C | 137 | 13.1 | 8.89 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
October in nearby cities
- Moncton in OctoberCanada · 134 kmHigh 12.6°C · Low 5.5°C · 98 mm rain
- Dartmouth in OctoberCanada · 206 kmHigh 13.5°C · Low 8.0°C · 124 mm rain
- Halifax in OctoberCanada · 207 kmHigh 13.2°C · Low 8.6°C · 124 mm rain
- Québec in OctoberCanada · 433 kmHigh 11.3°C · Low 4.1°C · 125 mm rain
- Sherbrooke in OctoberCanada · 457 kmHigh 12.1°C · Low 4.6°C · 119 mm rain
- Sydney, Canada in OctoberCanada · 466 kmHigh 12.6°C · Low 8.2°C · 131 mm rain
- Lawrence (Massachusetts), United States in OctoberUnited States · 498 kmHigh 15.9°C · Low 7.9°C · 96 mm rain
- Manchester, United States in OctoberUnited States · 499 kmHigh 15.2°C · Low 6.8°C · 101 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Saint John) is explained once on the Saint John year overview and on the Sources, method and limits page.