Loading lake details...
Loading lake details...

Grandaddy Lake
Hanna, UT · Duchesne County
Right Now
Mostly Clear
Water
55°
Wind
13 mph
WSW
Gusts
19 mph
Pressure
29.71
falling
Forecast - Sat, Jul 11
High / Low
76° / 49°
Wind
4 mph
gusts 13 mph
Precip
0%
UV
11
Sunrise
12:02 PM
Sunset
2:54 AM
Every forecast metric for the week ahead, plus best days for fishing, boating, swimming, and paddling.
Quick recommendations based on wind, precip, pressure, solunar, and temperature.
Best for Fishing
Tue, Tue, Jul 14
Tue, Jul 14 scores 83/100: Solunar 5/5, Wind 5 mph.
Best for Boating
Sat, Sat, Jul 11
Sat, Jul 11 scores 90/100: Wind 8 mph, Rain 0%.
Best for Swimming
Sat, Sat, Jul 11
Sat, Jul 11 scores 75/100: Air 76°F, Rain 0%.
Best for Paddling
Sat, Sat, Jul 11
Sat, Jul 11 scores 85/100: Wind 8 mph, Rain 0%.
Ask about this week:
Swipe to see all 9 days
| Metric | Sat11 | Sun12 | Mon13 | Tue14 | Wed15 | Thu16 | Fri17 | Sat18 | Sun19 |
|---|---|---|---|---|---|---|---|---|---|
| Condition | Mostly Clear | Mostly Clear | Partly Cloudy | Drizzle | Drizzle | Drizzle | Partly Cloudy | Drizzle | Drizzle |
| High / Low | 76°/49° | 78°/51° | 76°/53° | 73°/52° | 69°/51° | 71°/52° | 73°/52° | 72°/52° | 69°/50° |
| Precip | 0% | 0% | 21% | 39% | 44% | 34% | 28% | 37% | 49% |
| Wind | 8 mphgust 13 | 10 mphgust 19 | 7 mphgust 16 | 5 mphgust 14 | 5 mphgust 12 | 5 mphgust 14 | 7 mphgust 17 | 5 mphgust 15 | 5 mphgust 16 |
| Pressure | 29.89" stable | 29.94" rising | 30.00" rising | 30.02" rising | 30.00" falling | 29.94" falling | 29.94" stable | 30.04" rising | 30.03" stable |
| UV Index | 11 | 11 | 8 | 8 | 7 | 8 | 9 | 9 | 7 |
| Sunrise | 12:02 PM | 12:03 PM | 12:03 PM | 12:04 PM | 12:05 PM | 12:06 PM | 12:07 PM | 12:07 PM | 12:08 PM |
| Sunset | 2:54 AM | 2:54 AM | 2:53 AM | 2:53 AM | 2:52 AM | 2:52 AM | 2:51 AM | 2:50 AM | 2:50 AM |
| Bite Rating | 2/5waning crescent | 3/5waning crescent | 4/5NEW | 5/5NEW | 3/5NEW | 3/5NEW | 2/5waxing crescent | 2/5waxing crescent | 2/5waxing crescent |
Today Read
Grandaddy LakeWind read
Calm
4 mph avg
Water read
55°
Cool-water mix
Air range
49° / 76°
today
Precip
0%
low concern
Today's forecast for Grandaddy Lake has calm wind, 49F to 76F air temperatures, 0% chance of precipitation, and 55F water.
Trip planner
Transition temps can split fish between warming edges and deeper comfort zones. The planning constraint is weak timing.
Uses 8 live data sources for this lake. Tap a stat or ask a question.
Fishing Forecast
waning crescent
Major
4:09 PM - 6:39 PM
Minor
12:00 AM - 9:40 AM
Detailed temperature readings across your lake.
No credit card required for preview
Water Temperature History
Current
61°
Jul 19
Low
32°
Dec 7
Average
43°
Last 12 Months
Warmest avg: July (59°F)
Coolest avg: January (33°F)
Rapid warming: May → June (+19°F)
Sharpest cooling: October → November (-8°F)
Wind speed, gusts, and pressure trends for trip timing.
Swipe days or tap points
6am - 5am
Peak Wind
8 mph
6pm
Peak Gust
13 mph
highest gust
Pressure
29.82 inHg
rising
Visibility
40 mi
0% clouds
Tap chart for details, swipe left or right for different days.Tap chart for details • Swipe for different days
Pressure stability helps plan windows
Tap chart points for pressure details
Nearby Lakes
Fishing Forecast
2/5waning crescent
Water at 55°F -- good for cool-water species.
Nearby Lakes
FAQ
Grandaddy Lake covers 167.96 acres (0.26 square miles) with a maximum depth of 9.89 meters (~32 feet).
Grandaddy Lake is located in Hanna, Duchesne County, UT. It is accessible to the public for outdoor activities.