Upper Crystal Springs Reservoir

Upper Crystal Springs Reservoir

Belmont, San Mateo County, CA
1mi²
90.00ft
Directions
Lake Information

Upper Crystal Springs Reservoir is a scenic body of water situated in San Mateo County, California, offering anglers a chance to fish for Rainbow Trout and Bass. The reservoir is spread over an area of 592 acres, providing ample space for recreational fishing and other water-based activities. The natural beauty of Upper Crystal Springs Reservoir and its fish populations make it a popular destination for outdoor enthusiasts and tourists alike. The reservoir is an important natural resource for the local community and is carefully managed to ensure the sustainability of its fish populations. Regulations are in place to protect the ecosystem and maintain the health and vitality of the reservoir's fish and wildlife. The management practices also ensure the safety of the water supply for the surrounding communities. In conclusion, Upper Crystal Springs Reservoir is an important recreational destination for anglers in San Mateo County, California. Its diverse fish populations and range of activities make it a popular destination for outdoor enthusiasts, and its careful management ensures the sustainability of the ecosystem while providing safe and clean water supply for the local communities.

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Current Conditions

63°F°
Feels like 61°F°
PartlyCloudy
Today's High
65°F°
Today's Low
50°F°

Water Temperature

62°F
Updated: (Apr 28)
Sign in to contribute temps.

Current water temperature for Upper Crystal Springs Reservoir is 62°F.

Current Snapshot

Wind9 mph WSW (Gust 14 mph)
Pressure
30.01 inHg
Visibility13 mi
Humidity70%
Cloud Cover46%

Forecast: Wednesday, Apr 30

Day 1 of 9

Hourly Insights

7 AM
51°F°
10 AM
56°F°
1 PM
62°F°
4 PM
62°F°

Temperature

High
65°F°
Low
50°F°

Precipitation

Chance0%
Amount0.00"
Typeclear

Wind

6mph
Avg Speed
Gusts up to
18mph
CalmModerateStrong
Max Speed11 mph

Sun, Moon & UV

Sunrise1:14 PM
Sunset2:58 AM
Moon PhasewaxingCrescent
Max UV Index7 (High)

Solunar Fishing Forecast

Action Rating
2/5

Todays action is rated a 2 (scale is 0 thru 5, 5 is the best)

Major Times (Best)

10:40 PM - 1:10 AM

7:00 AM - 7:00 AM

Minor Times (Good)

2:44 PM - 4:14 PM

7:00 AM - 7:00 AM

Outlook for Wednesday at Upper Crystal Springs Reservoir

Expect temperatures ranging from 50°F to 65°F. Skies look partly cloudy with little chance of precipitation. Winds will be averaging 6 mph, with potential gusts reaching up to 18 mph. The maximum UV index will be 7 (High), so plan sun protection accordingly. For anglers, today's fishing action is rated 2/5 (Todays action is rated a 2 (scale is 0 thru 5, 5 is the best)). Look for the best bite times during the major periods around 10:40 PM and 7:00 AM, or try the minor windows near 2:44 PM and 7:00 AM for potential early morning or evening action. Check back for the latest conditions and forecasts for Upper Crystal Springs Reservoir.

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April 30th 2025

Lake Information

Elevation
90 ft
Area
1 mi²
Coordinates
37.500, -122.336

Weather Forecast

Wednesday

65°F
50°F

Thursday

64°F
50°F

Friday

59°F
51°F

Saturday

57°F
50°F

Sunday

60°F
49°F

Monday

68°F
51°F

Tuesday

64°F
52°F

Wednesday

65°F
53°F

Thursday

67°F
53°F
Wednesday - 4/30/2025
65°F
50°F
12am
51°F
62°F
30.00 hPa
5 mph
WSW
G: 10 mph
2am
50°F
62°F
29.99 hPa
6 mph
WSW
G: 11 mph
4am
50°F
62°F
29.97 hPa
5 mph
SW
G: 10 mph
6am
50°F
62°F
29.97 hPa
4 mph
SW
G: 8 mph
8am
52°F
62°F
29.99 hPa
5 mph
SW
G: 8 mph
10am
56°F
62°F
29.98 hPa
3 mph
WSW
G: 7 mph
12pm
63°F
62°F
29.97 hPa
4 mph
WSW
G: 8 mph
2pm
63°F
62°F
29.95 hPa
7 mph
WSW
G: 11 mph
4pm
62°F
62°F
29.92 hPa
9 mph
WSW
G: 15 mph
6pm
58°F
62°F
29.91 hPa
10 mph
WSW
G: 18 mph
8pm
56°F
62°F
29.93 hPa
9 mph
SW
G: 14 mph
10pm
54°F
62°F
29.95 hPa
8 mph
SW
G: 14 mph

Water Temperature History

Trends for Upper Crystal Springs Reservoir

Current Temp

Sign in to view

Latest recorded surface temperature.

Lowest in Period

50°F

On Dec 28

Coldest point in the Last 12 Months.

Average in Period

60°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: August (73°F).
  • Coolest avg: December (52°F).
  • Rapid warming often occurs: May → June (+6°F).
  • Sharpest cooling trend: October → November (-9°F).

Weather Forecast

Wind speed and pressure trends

Hourly Wind Forecast

12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm05101520

Wind Direction

237°

Pressure

1016 mb

Cloud Cover

22%

Visibility

10 miles

Daily Pressure Forecast

WedThuFriSatSunMonTueWedThu0.008.8617.7226.5835.44
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Frequently Asked Questions About Upper Crystal Springs Reservoir

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