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Moncton Weather in September
With daytime temperatures of 21°C (70°F) and nighttime lows of 10°C (50°F), September in Moncton brings pleasant temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 97 mm (3.8 in) falls on average.
Rainfall in Moncton in September
You can expect rain on around 11 days based on historical patterns, with 97 mm (3.8 in) average for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.
Temperature in Moncton in September
September is one of the better months to visit Moncton. Expect 21°C (70°F) during the day and 10°C (50°F) at night. Even when the weather is stable, mornings and evenings can still feel distinctly cool. Nights fall to 10°C (50°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.
Sunshine in Moncton in September
The month experiences a moderate amount of sunlight, with 173 hours of sunshine. This provides a nice balance between sunshine and clouds.Our weather planner can help you find worldwide destinations with pleasant weather during this period. June, July, August and September typically offer the best weather for Moncton.
Moncton Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
21°C (70°F)
Chance of Rain
38%
Precipitation
97 mm (3.8 in)
Rainy days
11 days
Sunshine
173 hours
Percentage Sunshine
45%
Moncton Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Moncton - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Moncton typically drop from around 22°C (72°F) at the start of September to approximately 18°C (64°F) by the end. Nights are cool, with lows typically ranging from 6°C (43°F) to 11°C (52°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Moncton in September
Browse day-by-day weather records for Moncton spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Moncton historical weather extremes in September
The extremes listed below come from historical weather data collected in Moncton from 1976 through 2026.
- On September 1, 2010, temperatures climbed to 34°C (93°F), marking the warmest September day on record.
- The lowest daytime temperature in September was 9°C (48°F), recorded on September 28, 2000.
- The coldest night in September in Moncton was on September 28, 1989, with a minimum of -3°C (27°F).
Best Places in Canada in September
Find out more about the weather in Canada and which places have the best travel conditions in this month. See all of Canada in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Moncton in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. Sunglasses could come in handy during the sunnier parts of your trip.
What To Do in Moncton in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming6/10 -
Cycling9/10 -
Walking9/10 -
Camping4/10 -
Outdoor sports9/10
Moncton 3-Day Forecast
More climate data for Moncton
See the full Moncton climate overview or explore weather in Canada.
Popular in September
Where to go in September - average daytime high across popular destinations.
Toronto
22°C (72°F) Niagara Falls23°C (73°F) Montréal
22°C (72°F) Ottawa22°C (72°F) Quebec City
20°C (68°F) Vancouver19°C (66°F) Calgary19°C (66°F) Whistler15°C (59°F) Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
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