
Lake Merwin
Na, WA · Cowlitz County
Right Now
Drizzle
Water
61°
Wind
4 mph
N
Gusts
9 mph
Pressure
29.98
steady
Forecast - Sun, Jun 7
High / Low
63° / 44°
Wind
2 mph
gusts 7 mph
Precip
24%
UV
5
Sunrise
12:20 PM
Sunset
3:58 AM
Today Read
Lake MerwinWind read
Calm
2 mph avg
Water read
61°
Cool-water mix
Air range
44° / 63°
today
Precip
24%
low concern
Today's forecast for Lake Merwin has calm wind, 44F to 63F air temperatures, 24% chance of precipitation, and 61F water.
Ask what to do at Lake Merwin today.
The planner reads this page's water temp, forecast, fish species, solunar timing, reports, and imagery context so you can decide what to throw, when to go, and when to move.
Today's AI read
Active-water pattern for Rainbow trout / Smallmouth bass
Active temps make wind edges, shallow cover, and feeding windows more important. Wind is not the main constraint, so timing and presentation can drive the plan. With a weak solunar score, favor stable weather windows.
Uses this lake data
Trip read from the AI planner
FishableFishing Forecast
Last quarter
Major
1:09 PM - 3:39 PM
Minor
7:43 AM - 9:13 AM
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Detailed temperature readings across your lake.
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Fish Species
4Water Temperature History
Current
67°
Jun 14
Low
38°
Feb 5
Average
54°
Last 12 Months
Warmest avg: July (71°F)
Coolest avg: February (39°F)
Rapid warming: April → May (+9°F)
Sharpest cooling: October → November (-13°F)
Weather Forecast
Wind speed, gusts, and pressure trends for trip timing.
Hourly Wind Forecast
Swipe days or tap points
7
12am - 11pm
Peak Wind
5 mph
3pm
Peak Gust
7 mph
highest gust
Pressure
30.05 inHg
rising
Visibility
10 mi
34% clouds
Tap chart for details, swipe left or right for different days.Tap chart for details • Swipe for different days
Daily Pressure Forecast
Pressure stability helps plan windows
Tap chart points for pressure details
Nearby Lakes
Fishing Forecast
2/5Last quarter
Water at 61°F -- good for cool-water species.
Fish Species
4Nearby Lakes
FAQ
About Lake Merwin
Lake Merwin covers 3840.00 acres (6.00 square miles)
Lake Merwin is located in Na, Cowlitz County, WA. It is accessible to the public for outdoor activities.