Lake Union

Lake Union

Seattle, King County, WA
1mi²
1.00ft
Directions
Lake Information

Lake Union is a freshwater lake located entirely within the city limits of Seattle, Washington, United States. It is a major part of the Lake Washington Ship Canal. The easternmost point of the lake is the Ship Canal Bridge, which carries Interstate 5 over the eastern arm of the lake and separates Lake Union from Portage Bay. Lake Union is the namesake of the neighborhoods located on its east and west shores: Eastlake and Westlake respectively. The northern shore of the lake is home to Gas Works Park. Notable features of the southern area of the lake—collectively known as the South Lake Union district—include Lake Union Park, Museum of History & Industry (MOHAI), and the Center for Wooden Boats. University of Washington campus frontage on Lake Union, 1919 The George Washington Memorial Bridge (also known as the Aurora Bridge) carries State Route 99 over the western arm of Lake Union. The Aurora Bridge is so named because it carries Aurora Ave N down the western side of the lake. Lake Union's westernmost point can be considered the Fremont Cut, which is located just west of the Aurora Bridge and is spanned by the Fremont Bridge. The Fremont Bridge carries Fremont Ave N between the neighborhoods of Fremont and Queen Anne and separates Lake Union from the rest of the Lake Washington Ship Canal to the west.

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Current Conditions

61°F°
Feels like 63°F°
MostlyClear
Today's High
68°F°
Today's Low
41°F°

Water Temperature

55°F
Updated: (May 4)
Sign in to contribute temps.

Current water temperature for Lake Union is 55°F.

Current Snapshot

Wind5 mph NNW (Gust 9 mph)
Pressure
30.24 inHg
Visibility26 mi
Humidity40%
Cloud Cover18%

Forecast: Monday, May 5

Day 1 of 9

Hourly Insights

7 AM
44°F°
10 AM
56°F°
1 PM
65°F°
4 PM
68°F°

Temperature

High
68°F°
Low
41°F°

Precipitation

Chance0%
Amount0.00"
Typeclear

Wind

3mph
Avg Speed
Gusts up to
12mph
CalmModerateStrong
Max Speed8 mph

Sun, Moon & UV

Sunrise12:45 PM
Sunset3:27 AM
Moon PhasewaxingGibbous
Max UV Index7 (High)

Solunar Fishing Forecast

Action Rating
3/5

Todays action is rated a 3 (scale is 0 thru 5, 5 is the best)

Major Times (Best)

3:09 AM - 5:39 AM

10:20 AM - 12:50 PM

Minor Times (Good)

7:56 PM - 9:26 PM

9:49 AM - 11:19 AM

Outlook for Monday at Lake Union

Expect temperatures ranging from 41°F to 68°F. Skies look mostly clear with little chance of precipitation. Winds will be averaging 3 mph, with potential gusts reaching up to 12 mph. The maximum UV index will be 7 (High), so plan sun protection accordingly. For anglers, today's fishing action is rated 3/5 (Todays action is rated a 3 (scale is 0 thru 5, 5 is the best)). Look for the best bite times during the major periods around 3:09 AM and 10:20 AM, or try the minor windows near 7:56 PM and 9:49 AM for potential early morning or evening action. Check back for the latest conditions and forecasts for Lake Union.

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May 4th 2025

Lake Information

Elevation
1 ft
Area
1 mi²
Coordinates
47.636, -122.330

Weather Forecast

Monday

68°F
41°F

Tuesday

76°F
47°F

Wednesday

64°F
49°F

Thursday

61°F
46°F

Friday

68°F
47°F

Saturday

67°F
51°F

Sunday

62°F
51°F

Monday

57°F
49°F

Tuesday

59°F
47°F
Monday - 5/5/2025
68°F
41°F
12am
47°F
55°F
30.29 hPa
1 mph
NE
G: 4 mph
2am
44°F
55°F
30.30 hPa
1 mph
E
G: 2 mph
4am
43°F
55°F
30.30 hPa
1 mph
NE
G: 3 mph
6am
41°F
55°F
30.30 hPa
1 mph
NE
G: 2 mph
8am
48°F
55°F
30.32 hPa
1 mph
ENE
G: 3 mph
10am
56°F
55°F
30.31 hPa
2 mph
NNW
G: 4 mph
12pm
62°F
55°F
30.28 hPa
4 mph
NW
G: 4 mph
2pm
67°F
55°F
30.25 hPa
4 mph
NW
G: 6 mph
4pm
68°F
55°F
30.20 hPa
8 mph
NNW
G: 12 mph
6pm
67°F
55°F
30.17 hPa
7 mph
NNW
G: 12 mph
8pm
61°F
55°F
30.17 hPa
5 mph
NNW
G: 11 mph
10pm
55°F
55°F
30.17 hPa
4 mph
N
G: 10 mph

Water Temperature History

Trends for Lake Union

Current Temp

Sign in to view

Latest recorded surface temperature.

Lowest in Period

36°F

On Jan 1

Coldest point in the Last 12 Months.

Average in Period

52°F

Typical temp during the Last 12 Months.

Temperature Trend: Last 12 Months

Surface temperature over the selected period.

Key Observations (Last 12 Months)

  • Warmest avg: July (75°F).
  • Coolest avg: January (42°F).
  • Rapid warming often occurs: June → July (+13°F).
  • Sharpest cooling trend: October → November (-12°F).

Weather Forecast

Wind speed and pressure trends

Hourly Wind Forecast

12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm036912

Wind Direction

36°

Pressure

1026 mb

Cloud Cover

2%

Visibility

17 miles

Daily Pressure Forecast

MonTueWedThuFriSatSunMonTue0.008.8617.7226.5835.44
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Frequently Asked Questions About Lake Union

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