Cool
Average highs are around 20°C, so pack for cooler days.
September verdict
Mixed for holiday weather
Average highs are around 20°C, so pack for cooler days. Sunshine averages 5.6h per day, enough for a balanced month. Rainfall averages 80mm, so some wet days are possible.

Monthly averages
Temp
20°C
Rain
80mm
Sun
5.6h
Weather score
44
Mixed
Cool
Average highs are around 20°C, so pack for cooler days.
Showers
Rainfall averages 80mm, so some wet days are possible.
Some sun
Sunshine averages 5.6h per day, enough for a balanced month.
Map
Compare Gatineau, Quebec, Canada with nearby places by weather score, rain, sun, temperature, and swim conditions.
September20°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsMay to September
This stretch sets the upper range for average daytime heat.
September80mm average rain
September is wetter than Gatineau's yearly average, so flexible plans matter more.
Driest monthsAll year
Rainfall stays comparatively low through the year.
September5.6 hours average sun
September sits close to Gatineau's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
September44 weather score
September sits close to Gatineau's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.