Grand lac Sec
48.3811° N, 71.7154° W
Grand lac Sec, Quebec. 48.3811° N, 71.7154° W
Not for navigation. Depths are from government surveys and may be outdated.
borealbound.ca/lakes/qc/grand-lac-sec/, 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.
- États trophiques des lacs (RSVL), 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).
Grand lac Sec covers 0.59 km², Quebec. It lies 19 km south of Alma.
- Area
- 0.59 km²
- Shoreline
- 5.7 km
- Water clarity
- 2.1 mSecchi depth, 2025
- Elevation
- 151 m
Today on the water
7.1 °C
Observed at Alma, as of 2:00 a.m. EDT
Wind from the west: the west shore is the sheltered side.
| Time | 5 a.m. | 8 a.m. | 11 a.m. | 2 p.m. | 5 p.m. | 8 p.m. | 11 p.m. | 2 a.m. |
|---|---|---|---|---|---|---|---|---|
| Wind km/h | W 15 | W 20 | W 20 | W 20 | W 20 | W 20 | W 20 | W 20 |
| Gusts km/h | 40 | 40 | 40 | 40 | 40 | 40 | 40 | |
| Temp. °C | 5 | 4 | 6 | 7 | 8 | 4 | 3 | 3 |
| Precip. % | 40 | 40 | 40 | 40 | 40 | 30 | 30 | 30 |
Tonight: Mainly cloudy with 40 percent chance of showers. Wind west 20 km/h gusting to 40 becoming light this evening. Low plus 4.
Weather: Alma (local forecast), as of 4:05 a.m. EDT
Sun and moon
- Civil dawn
- 6:26 a.m.
- Sunrise
- 6:57 a.m.
- Sunset
- 6:09 p.m.
- Civil dusk
- 6:40 p.m.
- Moonrise
- 5:47 a.m.
- Moonset
- 5:27 p.m.
- Moon
- Waning crescent, 1% lit
Follow this lake by email: a weekly summary of conditions.
Water
Trophic status from the latest monitoring: mesotrophic.
Clarity was measured with a Secchi disk in 2 years between 2024 and 2025; the latest annual mean is 2.1 m.
Follow this lake
Every Friday by email: the Environment Canada forecast and any weather alerts in effect.