Climate averages 1991–2020
Moncton weather
in August.
A warm, moderately wet month: the 2nd warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Moncton: daytime highs average 23.6°C and nights cool to about 15.4°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 76 mm of rain on roughly 10 days, which makes August a moderately wet month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 09 min on an average August day.
The nearest other city in this atlas is Saint John (134 km away). In August its highs average 21.0°C, 2.6°C cooler than Moncton, with 80 mm of rain.
Among the 86 cities listed in Canada, Moncton ranks joint 54th of 86 for the warmest August highs and joint 44th of 86 for the driest August (rainfall, lowest first). The mean August high of those 86 cities is 23.8°C; Moncton is 0.2°C cooler than that mean.
From August to September, average highs fall by 4.2°C to 19.4°C, and monthly rainfall rises from 76 mm to 93 mm.
The annual picture
August 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, selected | 23.6°C15.4°C | 15.4°C | 76 | 9.8 | 14.214 h |
| September | 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
August in nearby cities
- Saint John in AugustCanada · 134 kmHigh 21.0°C · Low 14.9°C · 80 mm rain
- Dartmouth in AugustCanada · 185 kmHigh 22.5°C · Low 16.4°C · 91 mm rain
- Halifax in AugustCanada · 187 kmHigh 21.4°C · Low 16.5°C · 91 mm rain
- Sydney, Canada in AugustCanada · 356 kmHigh 22.0°C · Low 16.4°C · 89 mm rain
- Québec in AugustCanada · 498 kmHigh 23.2°C · Low 14.7°C · 113 mm rain
- Saguenay in AugustCanada · 539 kmHigh 21.6°C · Low 12.9°C · 119 mm rain
- Sherbrooke in AugustCanada · 556 kmHigh 23.1°C · Low 14.8°C · 123 mm rain
- Trois-Rivières in AugustCanada · 597 kmHigh 23.9°C · Low 16.0°C · 109 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.