National Weather Service California Nevada River Forecast Center Department of Commerce National Oceanic and Atmospheric Administration National Weather Service

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TUOLUMNE RIVER - HETCH HETCHY RESERVOIR (HETC1)
Latitude: 37.95º NLongitude: 119.79º WElevation: 3870 Feet
Location: Tuolumne County in CaliforniaBulletin Group: San JoaquinRiver Group: San Joaquin
Issuance Time: Jun 22, 2025 at 8:53 AM PDT
Action/Monitor: N/A Minor Flood: N/A Moderate Flood: N/A Major Flood: N/A
Please Note:Ensemble forecasts produced by CNRFC only consider meteorological uncertainty and do not account for hydrologic uncertainty.
Threshold Exceedance Plot                  Product Information        CSV Ensemble Files (Data in kcfs):  Forecast Group  |  HETC1

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Official 7 Day National Weather Service Forecast   (CAZ323)
Today: Partly sunny. Slight chance of rain in the late morning and early afternoon. Slight chance of thunderstorms late in the afternoon. Highs 51 to 65. East winds up to 10 mph with gusts to around 25 mph shifting to the southwest in the afternoon. Chance of precipitation 20 percent.

Tonight: Partly cloudy with a 20 percent chance of thunderstorms in the evening, then clear after midnight. Lows 33 to 47. Northeast winds up to 10 mph.

Tuesday: Warmer, sunny. Highs 56 to 70. East winds up to 5 mph shifting to the west in the afternoon.

Tuesday Night: Mostly clear. Lows 36 to 52. West winds 5 to 10 mph shifting to the northeast after midnight.

Wednesday: Warmer, sunny. Highs 61 to 75. East winds up to 10 mph shifting to the southwest in the afternoon.

Wednesday Night through Sunday: Clear. Lows 38 to 58. Highs 62 to 82.