Big Rat Lake

46.0692° N, 77.4478° W

Big Rat Lake, Ontario. 46.0692° N, 77.4478° W

Not for navigation. Depths are from government surveys and may be outdated.

borealbound.ca/lakes/on/big-rat-lake/, 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.
Fisheries Management Zones, Ontario Ministry of Natural Resources. Contains information licensed under the Open Government Licence – Ontario.
Bathymetry lines and survey index, Ontario Ministry of Natural Resources. Contains information licensed under the Open Government Licence – Ontario.
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).

Big Rat Lake covers 0.34 km², Ontario. It lies 3.2 km northwest of Deep River.

Area: 0.34 km²
Shoreline: 3.2 km
Elevation: 112 m

Today on the water

Wind from the west: the west shore is the sheltered side.

Hourly forecast, next 24 hours
Time	9 a.m.	12 p.m.	3 p.m.	6 p.m.	9 p.m.	12 a.m.	3 a.m.	6 a.m.
Wind km/h	W 15	NW 30	NW 30	NW 15	var. 5	var. 5	var. 5	var. 5
Gusts km/h		50	50
Temp. °C	4	8	11	10	6	1	-2	-2
Precip. %	40	40	20	20	0	0	0	0

Today: A mix of sun and cloud. 40 percent chance of showers this morning and early this afternoon. Wind becoming northwest 30 km/h gusting to 50 near noon. High 12. UV index 3 or moderate.

Weather: Deep River (local forecast), as of 8:05 a.m. EDT

Sun and moon

Civil dawn: 6:48 a.m.
Sunrise: 7:18 a.m.
Sunset: 6:34 p.m.
Civil dusk: 7:04 p.m.
Moonrise: 6:10 a.m.
Moonset: 5:52 p.m.
Moon: Waning crescent, 1% lit