How warm is it in Quebec City in September?

Daytime highs averaged 18.3 °C, night-time lows 8.9 °C. The highest value of the past 10 years was 28.4 °C (5 Sep 2023), the lowest -1.6 °C (24 Sep 2018).

How often does it rain in Quebec City in September?

On average there were 12.9 rain days (at least 1 mm) with 86.6 mm of precipitation in total.

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Quebec City weather in September: temperature & rain

Photo: Wilfredor · CC0

🇨🇦 Weather in Quebec City in September

This is what the weather in Quebec City (Quebec, Canada) was like in September over the years 2017–2026.

Key facts at a glance

Prevailing weather: Partly cloudy

Avg. daytime high

18.3 °C

16.3 °C – 20.4 °C

Avg. night-time low

8.9 °C

7.0 °C – 10.8 °C

Avg. rain days in period

12.9

43 % of days · ≥ 1.0 mm

Avg. precipitation in period

86.6 mm

40.5 mm – 143 mm

Avg. cloud cover

57 %

This data source has no sunshine hours – average cloud cover is shown instead.

Avg. sea temperature

–

No sea nearby – no sea temperature.

Extremes: Highest temperature 28.4 °C (5 Sep 2023) · Lowest temperature -1.6 °C (24 Sep 2018) · Avg. daily peak wind 13 km/h

Weather mix of all days

51Sunny
74Partly cloudy
28Cloudy
73Light rain
56Rain

Summary

On average 18.3 °C during the day and 8.9 °C at night.
On average 12.9 rain days (Rain day = at least 1.0 mm of precipitation) with 86.6 mm of precipitation in total.
Prevailing weather: Partly cloudy.
Warmest year: 2023 (avg. 20.4 °C), coolest: 2019 (avg. 16.3 °C).
Wettest year: 2019 (143 mm), driest: 2025 (40.5 mm).
Extremes: 28.4 °C on 5 Sep 2023 and -1.6 °C on 24 Sep 2018.

Overall values from all 10 years. How is this calculated?

Temperatures per year

Average over your travel period

Precipitation & rain days

Year by year

2026
Avg. max17.9°Avg. min8.2°
Rain days
12 Rain days
Precipitation
65.0 mm
Avg. cloud cover
–
Sea temperature
–
Max 22.5 °C · Min 3.3 °C
2025
Avg. max18.7°Avg. min8.5°
Rain days
7 Rain days
Precipitation
40.5 mm
Avg. cloud cover
44 % cloudy
Sea temperature
–
Max 23.2 °C · Min 1.2 °C
2024
Avg. max19.4°Avg. min10.1°
Rain days
9 Rain days
Precipitation
60.3 mm
Avg. cloud cover
49 % cloudy
Sea temperature
–
Max 24.5 °C · Min 4.7 °C
2023
Avg. max20.4°Avg. min10.8°
Rain days
9 Rain days
Precipitation
67.6 mm
Avg. cloud cover
51 % cloudy
Sea temperature
–
Max 28.4 °C · Min 4.1 °C
2022
Avg. max17.6°Avg. min8.1°
Rain days
11 Rain days
Precipitation
65.3 mm
Avg. cloud cover
57 % cloudy
Sea temperature
–
Max 24.5 °C · Min 1.9 °C
2021
Avg. max18.2°Avg. min9.2°
Rain days
17 Rain days
Precipitation
115 mm
Avg. cloud cover
68 % cloudy
Sea temperature
–
Max 22.3 °C · Min 4.5 °C
2020
Avg. max16.4°Avg. min7.0°
Rain days
14 Rain days
Precipitation
119 mm
Avg. cloud cover
63 % cloudy
Sea temperature
–
Max 21.6 °C · Min -0.2 °C
2019
Avg. max16.3°Avg. min7.5°
Rain days
16 Rain days
Precipitation
143 mm
Avg. cloud cover
69 % cloudy
Sea temperature
–
Max 21.6 °C · Min 1.8 °C
2018
Avg. max18.1°Avg. min8.7°
Rain days
19 Rain days
Precipitation
106 mm
Avg. cloud cover
59 % cloudy
Sea temperature
–
Max 25.2 °C · Min -1.6 °C
2017
Avg. max19.7°Avg. min10.8°
Rain days
15 Rain days
Precipitation
84.9 mm
Avg. cloud cover
49 % cloudy
Sea temperature
–
Max 26.7 °C · Min 3.9 °C

Frequently asked questions

How warm is it in Quebec City in September?: Daytime highs averaged 18.3 °C, night-time lows 8.9 °C. The highest value of the past 10 years was 28.4 °C (5 Sep 2023), the lowest -1.6 °C (24 Sep 2018).
How often does it rain in Quebec City in September?: On average there were 12.9 rain days (at least 1 mm) with 86.6 mm of precipitation in total.

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Data sources

Weather data: Data obtained from the NASA Langley Research Center (LaRC) POWER Project funded through the NASA Earth Science/Applied Science Program
Reanalysis (weather model constrained by observations) on a coarse grid of about 50 km. Values represent a large area and can differ from local conditions, especially on islands, coasts and in mountains. Snow depth is the model value for the grid cell, not the depth on the slopes. No sunshine duration.
Reanalysis (weather model constrained by observations)
Reanalysis values represent a grid cell (approx. 25–50 km) and may differ from local measurements on coasts, islands and in mountains.
Sea temperature: MUR SST data were provided by JPL under support by NASA MEaSUREs program; accessed via NOAA CoastWatch ERDDAP
Daily multi-scale ultra-high resolution (≈ 1 km) analysis of satellite measurements (infrared, microwave) and in-situ data. Represents the foundation temperature below the daily warm surface layer. (Satellite and in-situ analysis)
Place search: Natural Earth (public domain) · GeoNames (CC BY 4.0) / OpenStreetMap (ODbL)