Union Reservoir Fishing Forecast

40.1843° N, 105.046° W

Fishing conditions for Union Reservoir

Today Tomorrow Aug 21 Aug 22 Aug 23 Aug 24
sunrise 06:14
sunset 19:54

Biting score

57%
OK biting conditions

The best time for fishing is afternoon

  • 02:00
  • 05:00
  • 08:00
  • 11:00
  • 14:00
  • 17:00
  • 20:00
  • 23:00
  • CloudyNight1
  • CloudyNight1
  • ClearSkyDay
  • ClearSkyDay
  • CloudyDay1
  • CloudyDay1
  • CloudyNight1
  • CloudyNight1
  • 24%
  • 42%
  • 27%
  • 37%
  • 57%
  • 46%
  • 49%
  • 33%
  • Poor biting conditions
  • OK biting conditions
  • Poor biting conditions
  • OK biting conditions
  • OK biting conditions
  • OK biting conditions
  • OK biting conditions
  • OK biting conditions

Now, August 19
2:49 PM

CloudyDay1
30° FEELS LIKE28°
wind
3.2 m/s GUSTS4.8 m/s
101.2 kPa FLAT PRESSURE
humidity
27%
uv index
0low
cloud cover
100%
visibility
24km
moon rise
12:50AM
moon
moonnew moon
  • Union Reservoir Solunar Fishing Activity Report for Today

    Current fishing activity in Union Reservoir, United States, according to the solunar forecast, is moderate, which leads to a medium bite score.

    Over the next 6 days, the highest fish activity is expected on Monday (11 PM peak), Friday (5 PM peak) and Saturday (2 AM peak) — making these the best times to go fishing in Union Reservoir.

  • Air conditions

    The air temperature is 86°F (30°C). Sunrise today: 06:14 AM, sunset: 07:54 PM. The weather conditions indicate the sky is overcast.

    The UV index is currently 0 (Low).

    The wind is coming from the north at 7.2 mph (3.2 m/s), with gusts reaching 10.7 mph (4.8 m/s). Atmospheric pressure is 29.88 inHg (759 mmHg).

  • Moon Phases

    The moon phase is currently new moon, with moonrise at 12:50 PM and moonset at 10:10 PM.

About this spot

  • Union Reservoir Solunar Fishing Activity Report for Today

    Current fishing activity in Union Reservoir, United States, according to the solunar forecast, is moderate, which leads to a medium bite score.

    Over the next 6 days, the highest fish activity is expected on Monday (11 PM peak), Friday (5 PM peak) and Saturday (2 AM peak) — making these the best times to go fishing in Union Reservoir.

  • Air conditions

    The air temperature is 86°F (30°C). Sunrise today: 06:14 AM, sunset: 07:54 PM. The weather conditions indicate the sky is overcast.

    The UV index is currently 0 (Low).

    The wind is coming from the north at 7.2 mph (3.2 m/s), with gusts reaching 10.7 mph (4.8 m/s). Atmospheric pressure is 29.88 inHg (759 mmHg).

  • Moon Phases

    The moon phase is currently new moon, with moonrise at 12:50 PM and moonset at 10:10 PM.

Archive

About this spot

Reviews 1

  • WA
    Windy AI 08 July 2026
    Union Reservoir in Weld County near Longmont, Colorado, is a productive Front Range fishing lake supporting largemouth bass, walleye, wiper, tiger muskie, and northern pike in a reservoir managed by the City of Longmont. Spot Features: Union Reservoir in Weld County, Colorado, near Longmont, is an 800-acre reservoir managed by the City of Longmont, with excellent largemouth bass, walleye, wiper, tiger muskie, and northern pike fishing accessible from the Union Reservoir boat launches. Seasonality: Largemouth bass and walleye are the primary targets in Union Reservoir in Weld County, Colorado, year-round, with bass most active in spring and fall and walleye best in spring and fall. Wiper (hybrid striped bass) are aggressive fall and spring feeders. Tiger muskie are fall trophy targets. Northern pike are year-round predators.
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Nearest Meteostations

Closest meteostation (2.12 km):

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