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Union Lake
71°F
Union Lake
Erskine, MN · Polk County
71°F water736 acres83 ft deep1,188 ft elev9 fish species
Right Now
87°
Mostly Clear
Water
71°
Wind
8 mph
NE
Gusts
13 mph
Pressure
30.04
steady
LakeMonster planner
Plan Union Lake
Union Lake
Warm water pushes the plan toward oxygen, shade, depth changes, and low light. The planning constraint is finding the right window.
Best first move
Scout a wind-touched point or bank next to deeper water.
keep shade, oxygen, and a nearby depth change in the plan A workable forecast window starts near 6am with about 8 mph wind.
Listed targets to ask about: Largemouth bass · Smallmouth bass
9 lake data sources in this readSee dataHideLatest source updated Jul 15, 9:40 PM CDT
- Current water temp
- 71°F
- Water temp history
- 456 readings
- Hourly weather
- 224 hours
- Solunar timing
- 3/5
- Fish species
- 9 listed
- Satellite imagery
- 305 captures
- Thermal imagery
- 1334 captures
- Map structure
- available
- Nearby lakes
- 3 options
The quick read is a planning aid, not a safety or access determination. The assistant will state uncertainty when the page does not contain a specific observation.
Forecast - Wed, Jul 15
High / Low
84° / 67°
Wind
9 mph
gusts 18 mph
Precip
30%
UV
8
Sunrise
5:42 AM
Sunset
9:18 PM
7-Day Weather Outlook
Every forecast metric for the week ahead, plus best days for fishing, boating, swimming, and paddling.
9 day forecast
Best Days This Week
Quick recommendations based on wind, precip, pressure, solunar, and temperature.
Best for Fishing
Tue, Jul 21
59/100
Tue, Jul 21 scores 59/100: Solunar 3/5, Wind 8 mph.
Best for Boating
Sat, Jul 18
80/100
Sat, Jul 18 scores 80/100: Wind 10 mph, Rain 0%.
Best for Swimming
Sat, Jul 18
75/100
Sat, Jul 18 scores 75/100: Air 85°F, Rain 0%.
Best for Paddling
Tue, Jul 21
80/100
Tue, Jul 21 scores 80/100: Wind 8 mph.
Temperature Range
High Low
Precip & Wind
Rain % Wind mph
Daily Breakdown
Swipe to see all 9 days
| Metric | Wed15 | Thu16 | Fri17 | Sat18 | Sun19 | Mon20 | Tue21 | Wed22 | Thu23 |
|---|---|---|---|---|---|---|---|---|---|
| Condition | Drizzle | Mostly Cloudy | Thunderstorms | Mostly Clear | Rain | Drizzle | Drizzle | Mostly Cloudy | Drizzle |
| High / Low | 84°/67° | 87°/66° | 83°/69° | 85°/64° | 88°/64° | 84°/66° | 77°/59° | 79°/58° | 82°/63° |
| Precip | 30% | 47% | 50% | 0% | 48% | 60% | 36% | 29% | 36% |
| Wind | 12 mphgust 18 | 10 mphgust 19 | 14 mphgust 22 | 10 mphgust 17 | 12 mphgust 21 | 16 mphgust 25 | 8 mphgust 19 | 7 mphgust 11 | 8 mphgust 13 |
| Pressure | 30.10" stable | 29.97" falling | 29.88" falling | 29.95" rising | 29.80" falling | 29.76" falling | 30.00" rising | 30.05" rising | 29.93" falling |
| UV Index | 8 | 6 | 6 | 8 | 7 | 8 | 6 | 5 | 5 |
| Sunrise | 5:42 AM | 5:43 AM | 5:44 AM | 5:45 AM | 5:46 AM | 5:47 AM | 5:49 AM | 5:50 AM | 5:51 AM |
| Sunset | 9:18 PM | 9:17 PM | 9:16 PM | 9:15 PM | 9:14 PM | 9:13 PM | 9:12 PM | 9:11 PM | 9:10 PM |
| Bite Rating | 3/5NEW | 3/5NEW | 2/5waxing crescent | 2/5waxing crescent | 2/5waxing crescent | 3/5waxing crescent | 3/5first quarter | 2/5first quarter | 2/5first quarter |
Today Read
Union LakeWind read
Calm
9 mph avg
Water read
71°
Warm-water bite
Air range
67° / 84°
today
Precip
30%
low concern
Today's forecast for Union Lake has calm wind, 67F to 84F air temperatures, 30% chance of precipitation, and 71F water.
Fishing Forecast
NEW
3/5
Major
2:23 PM - 4:53 PM
Minor
6:32 AM - 8:02 AM
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July 12, 2026
Fish Species
9Water Temperature History
Current
75°
Jul 19
Low
32°
Feb 16
Average
55°
Last 12 Months
Warmest avg: July (75°F)
Coolest avg: March (37°F)
Rapid warming: April → May (+16°F)
Sharpest cooling: August → September (-12°F)
Weather Forecast
Wind speed, gusts, and pressure trends for trip timing.
7 day view
Hourly Wind Forecast
Swipe days or tap points
15
12am - 11pm
Wind SpeedWind Gust
Tap pointsPeak Wind
12 mph
11am
Peak Gust
18 mph
highest gust
Pressure
30.08 inHg
rising
Visibility
21 mi
11% 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
Pressure
Tap for detailsTap chart points for pressure details
Nearby Lakes
Fishing Forecast
3/5NEW
Major2:23 PM - 4:53 PM
Minor6:32 AM - 8:02 AM
Water at 71°F -- warm-water species active.
Fish Species
9Nearby Lakes
Lake facts
About Union Lake
Direct answers from the lake profile and latest available condition data. Verify access, regulations, weather alerts, and safety conditions with local authorities.
The latest available LakeMonster reading for Union Lake, updated Jul 15, 2026, shows 71°F surface water temperature, mostly clear, 8 mph wind. Conditions can vary across the lake and change quickly, so check local weather, access notices, and on-water observations before acting.
Union Lake has 736 acres and a reported maximum depth of about 83 feet based on the latest lake profile available to LakeMonster.
Union Lake is listed in Erskine, Polk County, MN. Check the responsible local or state agency for current access rules, permits, closures, and boating restrictions.
LakeMonster lists Largemouth bass, Smallmouth bass, Northern pike, Walleye, Bluegill, Yellow perch, Bullhead, Gar, Channel catfish for Union Lake. A species listing does not guarantee current activity; use current temperature, weather, recent reports, and local regulations when planning.