Climate averages 1991–2020
Moncton weather
in September.
A mild, wet month: the 4th warmest and the joint 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Moncton: daytime highs average 19.4°C and nights cool to about 11.4°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 93 mm of rain on roughly 9 days, which makes September a wet month (the joint 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 36 min on an average September day.
The nearest other city in this atlas is Saint John (134 km away). In September its highs average 17.8°C, 1.6°C cooler than Moncton, with 108 mm of rain.
Among the 86 cities listed in Canada, Moncton ranks 58th of 86 for the warmest September highs and joint 56th of 86 for the driest September (rainfall, lowest first). The mean September high of those 86 cities is 19.8°C; Moncton is 0.4°C cooler than that mean.
From September to October, average highs fall by 6.8°C to 12.6°C, and monthly rainfall rises from 93 mm to 98 mm.
The annual picture
September 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
Moncton climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -3.5°C-12.8°C | -12.8°C | 93 | 11.4 | 9.19 h |
| February | -2.5°C-11.8°C | -11.8°C | 83 | 10.1 | 10.310 h |
| March | 1.8°C-6.9°C | -6.9°C | 98 | 11.5 | 11.912 h |
| April | 8.2°C-0.5°C | -0.5°C | 85 | 12.5 | 13.514 h |
| May | 15.3°C5.7°C | 5.7°C | 85 | 12.5 | 14.915 h |
| June | 20.5°C11.5°C | 11.5°C | 91 | 11.8 | 15.716 h |
| July | 24.1°C15.6°C | 15.6°C | 82 | 11.5 | 15.415 h |
| August | 23.6°C15.4°C | 15.4°C | 76 | 9.8 | 14.214 h |
| September, selected | 19.4°C11.4°C | 11.4°C | 93 | 9.3 | 12.613 h |
| October | 12.6°C5.5°C | 5.5°C | 98 | 10.7 | 11.011 h |
| November | 5.9°C-0.4°C | -0.4°C | 98 | 10.7 | 9.510 h |
| December | -0.1°C-7.5°C | -7.5°C | 112 | 12.2 | 8.79 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
September in nearby cities
- Saint John in SeptemberCanada · 134 kmHigh 17.8°C · Low 11.8°C · 108 mm rain
- Dartmouth in SeptemberCanada · 185 kmHigh 19.3°C · Low 13.3°C · 97 mm rain
- Halifax in SeptemberCanada · 187 kmHigh 18.6°C · Low 13.7°C · 97 mm rain
- Sydney, Canada in SeptemberCanada · 356 kmHigh 18.5°C · Low 13.2°C · 104 mm rain
- Québec in SeptemberCanada · 498 kmHigh 18.9°C · Low 10.4°C · 109 mm rain
- Saguenay in SeptemberCanada · 539 kmHigh 17.2°C · Low 8.6°C · 127 mm rain
- Sherbrooke in SeptemberCanada · 556 kmHigh 19.3°C · Low 10.8°C · 106 mm rain
- Trois-Rivières in SeptemberCanada · 597 kmHigh 19.6°C · Low 11.7°C · 98 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 Moncton) is explained once on the Moncton year overview and on the Sources, method and limits page.