7-day outlook
Daylight hours, 8am to 7pm local time. Wind in knots.
-
TodayOct 26
0-3kt
WSW, gusts 6
High 72°F, rain 1%
Light wind -
TueOct 27
2-5kt
ESE, gusts 9
High 71°F, rain 0%
Use caution -
WedOct 28
4kt
S, gusts 8
High 73°F, rain 0%
Light wind -
ThuOct 29
6-11kt
SW, gusts 16
High 75°F, rain 0%
Good -
FriOct 30
3-4kt
NW, gusts 7
High 73°F, rain 4%
Light wind -
SatOct 31
4-6kt
SE, gusts 11
High 71°F, rain 15%
Good -
SunNov 1
5-7kt
S, gusts 12
High 68°F, rain 55%
Good
Hour by hour, next 3 days
This week on Grand Lake St Marys
Over the next 7 days on Grand Lake St Marys, the windiest stretch looks like Thursday, with gusts to about 16 kt. Monday is the calmest day in the outlook, topping out near 3 kt.
Thursday is the pick for sailing, and Monday looks best for kayaks and paddleboards. Mornings are usually calmer than afternoons, so check the hourly strip for the exact window.
Reading a lake wind forecast
Sustained wind is the average over a couple of minutes; gusts are the short peaks. On inland water the gap between the two matters as much as the average. A steady 12 kt is a pleasant sail, while 8 kt gusting 20 kt knocks small boats flat and tires out paddlers.
Grand Lake St Marys is large enough for wind to build real waves. When the forecast direction lines up with the long open stretches of the lake, expect bigger chop than the wind speed alone suggests, and plan routes that keep you near a sheltered shore on the way back.
The National Weather Service forecast covers a 2.5 km grid, so local effects like a sea breeze off a big lake, a cold front or afternoon thunderstorms can arrive earlier or stronger than shown. Check the forecast again on the morning you go, and keep an eye on small craft advisories.
Grand Lake St Marys forecast questions
What is the wind forecast for Grand Lake St Marys this weekend?
In the National Weather Service forecast from October 26: Saturday: SE wind 4 to 6 kt, gusts to 11 kt, high near 71°F. Sunday: S wind 5 to 7 kt, gusts to 12 kt, high near 68°F, 55% chance of rain. The live cards above always show the latest update.
When is the best day to sail on Grand Lake St Marys this week?
Based on the National Weather Service forecast from October 26, Thursday looks best, with SW wind around 6 to 11 kt and gusts near 16 kt. Forecasts beyond three days shift, so check the live day cards above and look again the night before.
Where does the Grand Lake St Marys wind forecast come from?
From the National Weather Service gridded forecast for the 2.5 km cell over the lake. It is the same forecast local NWS offices use, updated several times a day. We convert wind to knots and add our own go or no-go call for each activity.
What wind is too strong for a kayak or paddleboard?
We flag paddling as risky once sustained wind passes about 8 kt or gusts pass 12 kt, and advise staying ashore above 12 kt sustained or 18 kt gusts. Offshore wind is the most dangerous because it pushes you away from the launch.
Nearby lakes
If Grand Lake St Marys is blown out, these are the closest alternatives. Tap through for their wind forecasts.