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O'Brien Lake, CA Weather Forecast
O'Brien Lake, CA Weather Forecast Date: 1129 AM PDT Sat Oct 17 2026
The area/counties/county of: San Luis Obispo County Interior Valleys, including: Carrizo Plain, Creston, and Shandon.or toggle through each period.
Today... Sunny. Highs in the mid 80s to mid 90s. East winds 15 to 25 mph with gusts to 35 mph.
Tonight... Clear. Lows in the mid 40s to mid 50s.
Sunday... Sunny. Highs in the upper 70s and 80s.
Sunday Night... Clear. Lows in the mid 40s to lower 50s. West winds around 15 mph in the evening.
Monday... Sunny. Highs in the 70s to lower 80s. Southwest winds around 15 mph in the afternoon.
Monday Night... Mostly clear in the evening then partly cloudy. Lows in the upper 30s to mid 40s except around 50 in the carrizo plain.
Tuesday... Partly cloudy in the morning then mostly cloudy. Highs in the mid 60s to mid 70s.
Tuesday Night... Mostly cloudy with a 40% chance of showers. Lows in the 40s to lower 50s.
Wednesday... A chance of showers in the morning, then showers likely in the afternoon. Highs in the 60s to around 70. Chance of precipitation 70%.
Wednesday Night... Showers likely in the evening, then a chance of showers after midnight. Lows in the 40s to around 50. Chance of precipitation 60%.
Thursday... Mostly cloudy with a 50% chance of showers. Highs in the upper 50s to mid 60s.
Thursday Night... Partly cloudy with a 20% chance of showers in the evening, becoming mostly clear after midnight. Lows in the upper 30s and 40s.
POP = Probability of Precipitation
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