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: 1216 PM PDT Mon Aug 31 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... Clear this evening...Becoming partly cloudy. Lows 58 to 65. Areas of winds southwest 10 mph this evening becoming light.
Tuesday... Mostly sunny. Highs around 81 towards the coast to 83 to 86 farther inland. Light winds becoming southwest 10 mph in the afternoon.
Tuesday Night... Mostly clear. Lows 56 to 63. Areas of winds west 10 mph in the evening becoming light.
Wednesday... Mostly sunny. Highs 81 to 85. Light winds becoming southwest 10 mph in the afternoon.
Wednesday Night... Mostly clear. Lows 57 to 65. Areas of winds west 10 mph in the evening becoming light.
Thursday... Partly cloudy in the morning...Becoming mostly sunny. Highs 81 to 85.
Thursday Night... Mostly clear. Lows 58 to 66.
Friday... Partly cloudy in the morning...Becoming mostly sunny. Highs 80 to 83 towards the coast to 85 farther inland.
Friday Night... Mostly clear in the evening...Becoming partly cloudy. Lows 60 to 67.
Saturday... Partly cloudy with a slight chance of showers. Highs 81 to 84 towards the coast to 85 farther inland.
Saturday Night... Partly cloudy with a slight chance of showers. Lows 63 to 69.
Sunday... Partly cloudy with a slight chance of showers. Highs around 86 towards the coast to 90 farther inland.
Sunday Night... Partly cloudy with a slight chance of showers. Lows 66 to 71.
POP = Probability of Precipitation
Upper Oso Reservoir Radar Loop
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