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LakeMonster.com is a BETA data site created to help lake enthusiasts of all kinds by combining the latest satellite imagery, weather data, lake staff information, and community member reports to communicate current lake conditions.
Check the map below for point temperatures. Drought conditions and low water levels are affecting smaller lake temperature accuracy. We are working to resolve the issue. Please help others by submitting your observed temperatures.

Grand Lake Saint Marys State Park , OH
GPS: 40.522, -84.422 Google Map · LakeMonster Map
Views: 411
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~ 382 miles away - (776)
Today's Forecast Oct 25, 2021
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Grand Lake Saint Marys State Park's current water temperature is 55°F. Today's forecast is: , with a high around 60°F and a low around 49°F. Winds are out of the SW at 14 mph with gusts of 34 mph.

Current Conditions
55°F
Water estimate as of
Oct 12, 2021
60° 49° F
Air
SSE 14 - 34 gust
Wind
Temps are estimates of the surface temp acquired throughout the lake. Values are generally within a few degrees, but may be inaccurate due to factors including cloud cover, land interference, water levels, and input data quality/accuracy. If a temp is inaccurate, please contact us. Consider helping us improve our accuracy by creating an account and submitting your observed water temps in the section below.


Community Water Temps
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   Your
   Temperature

Latest satelite temp: 55°F
55°F
  Warning: Greater than 10% difference.




Forecast as of Oct 25, 2021
gust  
5  
6+  
11+  
16+  
21+
Monday
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57° 46°
SW 14-34 mph
6
8
10
12
2
4
6
8

Rain until evening.
Tuesday
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54° 36°
N 12-29 mph
6
8
10
12
2
4
6
8

Partly cloudy throughout the day.
Wednesday
image
57° 48°
E 6-25 mph
6
8
10
12
2
4
6
8

Mostly cloudy throughout the day.
Thursday
image
58° 50°
SE 12-32 mph
6
8
10
12
2
4
6
8

Rain throughout the day.
Friday
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53° 49°
NE 13-32 mph
6
8
10
12
2
4
6
8

Rain throughout the day.
Saturday
image
51° 45°
N 15-31 mph
6
8
10
12
2
4
6
8

Light rain in the morning.
Sunday
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57° 44°
NW 9-18 mph
6
8
10
12
2
4
6
8

Clear throughout the day.
Monday
image
57° 37°
W 10-25 mph

Partly cloudy throughout the day.

Latest Satellite Imagery
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Description
Originally constructed as a feeder reservoir for the Miami-Erie Canal, Grand Lake St. Marys was for many years recognized as the largest man-made reservoir in the world. This large lake is the gateway to swimming, boating, camping and fishing in one of Ohio's oldest state parks

Related sites:
en.wikipedia.org
www.stateparks.com

Attributes
Acres 13,498
Base Elevation 856 Ft

Pressure
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Recent Water Temperatures
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Nearby Lakes
Water: 61° H: 60° L: 49°
Wind 14-33 mph
Lake Loramie Rain until evening. 19 miles from Grand Lake Saint Marys State Park Minster, OH
Water: 66° H: 59° L: 49°
Wind 13-32 mph
Bresler Lake Reservoir Rain until evening. 29 miles from Grand Lake Saint Marys State Park Lima, OH
Water: 44° H: 62° L: 49°
Wind 14-36 mph
Indian Lake Rain until evening. 47 miles from Grand Lake Saint Marys State Park Lakeview, OH
Water: 0° H: 62° L: 49°
Wind 15-37 mph
Kiser Lake Rain until evening. 55 miles from Grand Lake Saint Marys State Park Conover, OH
Water: 69° H: 57° L: 48°
Wind 13-30 mph
Paulding Reservoir Rain until evening. 68 miles from Grand Lake Saint Marys State Park Paulding, OH
Water: 75° H: 65° L: 52°
Wind 13-30 mph
Eastwood Lake Rain until evening. 85 miles from Grand Lake Saint Marys State Park Dayton, OH
Water: 68° H: 63° L: 51°
Wind 14-31 mph
Clarence J Brown Reservoir Rain until evening. 85 miles from Grand Lake Saint Marys State Park Villa, OH
Water: 54° H: 59° L: 49°
Wind 12-28 mph
Findlay Reservoir Rain until evening. 90 miles from Grand Lake Saint Marys State Park Findlay, OH
Water: 0° H: 56° L: 49°
Wind 14-31 mph
Oxbow Lake Rain until evening. 92 miles from Grand Lake Saint Marys State Park Defiance, OH
Water: 0° H: 63° L: 48°
Wind 16-34 mph
Summit Lake Rain until evening. 93 miles from Grand Lake Saint Marys State Park New Castle, IN
Water: 62° H: 57° L: 48°
Wind 14-29 mph
J Edward Roush Lake (Huntington Lake) Rain until evening. 94 miles from Grand Lake Saint Marys State Park Huntington , IN
Water: 68° H: 59° L: 48°
Wind 14-29 mph
Salamonie Lake Rain until evening. 107 miles from Grand Lake Saint Marys State Park Andrews, IN
Water: 64° H: 65° L: 51°
Wind 14-33 mph
Acton Lake Rain until evening. 109 miles from Grand Lake Saint Marys State Park College Corner, OH
Water: 60° H: 64° L: 50°
Wind 14-36 mph
Whitewater Lake Rain until evening. 112 miles from Grand Lake Saint Marys State Park Liberty, IN
Water: 71° H: 65° L: 52°
Wind 13-32 mph
Caesar Creek Lake Rain until evening. 117 miles from Grand Lake Saint Marys State Park Waynesville, OH
Water: 63° H: 60° L: 50°
Wind 12-27 mph
Delaware Lake Rain throughout the day. 117 miles from Grand Lake Saint Marys State Park Delaware, OH
Water: 62° H: 66° L: 51°
Wind 13-36 mph
Brookville Lake Rain until evening. 121 miles from Grand Lake Saint Marys State Park Fairfield, IN
Water: 58° H: 52° L: 45°
Wind 16-34 mph
Hamilton Lake Rain until evening. 123 miles from Grand Lake Saint Marys State Park Hamilton, IN
Water: 51° H: 64° L: 54°
Wind 11-26 mph
Griggs Reservoir Rain throughout the day. 126 miles from Grand Lake Saint Marys State Park Columbus, OH
Water: 66° H: 61° L: 53°
Wind 12-29 mph
Alum Creek Lake Rain throughout the day. 130 miles from Grand Lake Saint Marys State Park Delaware, OH