Weather WorldUpper Oso Reservoir, CA 7-Day Night Weather Forecast
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Upper Oso Reservoir, CA Weather Forecast
Upper Oso Reservoir, CA Weather Forecast Date: 143 PM PDT Fri Oct 23 2026
The area/counties/county of: Orange County Inland Areas, including the cities of: Santa Ana, Anaheim, Garden Grove, Irvine, Orange, Fullerton, and Mission Viejo.or toggle through each period.
Tonight... Partly cloudy with a slight chance of showers this evening, then mostly clear overnight. Lows 52 to 56. Light winds. Chance of measurable precipitation 20%.
Saturday... Mostly sunny. Highs 75 to 79. Light winds becoming west 10 mph in the afternoon.
Saturday Night... Mostly clear. Lows 55 to 59. Light winds.
Sunday... Mostly sunny. Highs 79 to 82. Light winds.
Sunday Night... Mostly clear. Lows 57 to 61. Areas of winds west to 10 mph in the evening becoming light.
Monday... Mostly sunny. Highs 80 to 83.
Monday Night... Mostly clear. Lows 56 to 59.
Tuesday... Partly cloudy in the morning...Becoming mostly sunny. Highs around 80.
Tuesday Night... Mostly clear in the evening...Becoming partly cloudy. Lows 55 to 59.
Wednesday... Partly cloudy. Highs 76 to 79.
Wednesday Night... Partly cloudy. Lows 55 to 59.
Thursday... Mostly cloudy in the morning...Becoming partly cloudy. Highs 73 to 76.
Thursday Night... Partly cloudy. Lows 55 to 59.
POP = Probability of Precipitation
Upper Oso Reservoir Radar Loop
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