Lac Sunday
45.882° N, 71.5066° W
Depth contours from the 2012 government survey. Not for navigation.
Download the depth map (SVG)Lac Sunday, Quebec. 45.882° N, 71.5066° W
Maximum depth 45.7 m (2012 survey). Scale bar on the map.
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/qc/lac-sunday/, compiled October 9, 2026
- Canadian Geographical Names Database, Natural Resources Canada. Contains information licensed under the Open Government Licence – Canada.
- HydroLAKES v1.0, Messager et al. 2016 / WWF HydroSHEDS. Licensed under CC BY 4.0.
- Census boundaries and population, 2021, Statistics Canada. Adapted from Statistics Canada. This does not constitute an endorsement by Statistics Canada.
- Géobase des bathymétries de lac du Québec (GBLQ), Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs. Licensed under CC BY 4.0. Source: Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs (MELCCFP), Données Québec.
- City page weather forecasts and alerts, Environment and Climate Change Canada. Contains data from Environment and Climate Change Canada (ECCC Data Servers End-use Licence).
Lac Sunday is 45.7 m deep at its deepest point, deeper than 92% of the 1,506 surveyed lakes in Quebec. It covers 0.96 km² and lies 2.5 km north of Saints-Martyrs.
- Maximum depth
- 45.7 msurveyed 2012
- deeper than 92% of the 1,506 surveyed lakes in Quebec
- Area
- 0.96 km²
- larger than 74% of the 29,407 lakes in Quebec
- Shoreline
- 6.2 km
- longer than 67% of the 29,407 lakes in Quebec
- Elevation
- 369 m
Today on the water
YELLOW ADVISORY - FROST · issued 4:39 a.m. EDT
Temperatures will drop to near the freezing mark overnight tonight. Take preventative measures to protect cold-sensitive plants, trees, and crops. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to QCstorm@ec.gc.ca or post reports on social media using #QCStorm.
Official alert on weather.gc.ca · expires 8:39 p.m. EDT
5.4 °C
Observed at Thetford Mines, as of 6:00 a.m. EDT
choppy Estimated waves, next 12 hours: up to 0.2 m. Around 9 a.m., wind from the west: the west shore is sheltered, waves build toward the east shore.
| Time | 7 a.m. | 10 a.m. | 1 p.m. | 4 p.m. | 7 p.m. | 10 p.m. | 1 a.m. | 4 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | W 10 | W 20 | W 20 | W 20 | W 20 | W 15 | W 10 | W 10 |
| Gusts km/h | 40 | 40 | 40 | |||||
| Waves (est.) m | 0.1 | 0.2 | 0.2 | 0.2 | 0.2 | |||
| Temp. °C | 7 | 9 | 11 | 11 | 8 | 6 | 4 | 2 |
| Precip. % | 40 | 40 | 40 | 40 | 40 | 0 | 0 | 0 |
Today: Mainly cloudy with 40 percent chance of showers. Risk of a thunderstorm late this afternoon. Wind becoming west 20 km/h gusting to 40 this morning. High 12. UV index 3 or moderate.
Weather: Thetford Mines (local forecast), as of 6:01 a.m. EDT
Sun and moon
- Civil dawn
- 6:25 a.m.
- Sunrise
- 6:54 a.m.
- Sunset
- 6:10 p.m.
- Civil dusk
- 6:40 p.m.
- Moonrise
- 5:45 a.m.
- Moonset
- 5:28 p.m.
- Moon
- Waning crescent, 1% lit
Depth
40% of Lac Sunday is deeper than 20 m.
How to read it: the lake’s area is sorted from the shore to the deepest point. Where the curve is flat, large areas share one depth (flats and weed beds); where it drops, depth changes quickly (drop-offs).
The government depth survey from 2012 records a maximum depth of 45.7 m, drawn from 11 depth contours.
- Download the depth map (SVG)Printing this page gives the map on one sheet, with scale and sources.
- Official government depth map (PDF)
Not for navigation. Depths are from government surveys and may be outdated.