10-Day Weather Forecast - Port Costa, CA

Mostly cloudy. Highs around 80. West winds 5 to 10 mph.

Mostly cloudy. A slight chance of rain after midnight. Lows in the 50s. West winds 5 to 10 mph. Chance of rain 20 percent.

Mostly cloudy. A slight chance of rain in the morning then a chance of rain in the afternoon. Highs around 70. Southwest winds 5 to 10 mph. Chance of rain 40 percent.

Mostly cloudy in the evening then becoming partly cloudy. A chance of rain. Lows near 50.

Mostly cloudy. A chance of rain. Highs around 70. Lows in the mid 40s to lower 50s.

Mostly cloudy. A chance of rain. Highs around 70. Lows in the mid 40s to lower 50s.

Partly cloudy in the morning then becoming sunny. A slight chance of rain. Highs in the mid 60s.

Clear. Lows in the 40s. Highs in the upper 70s.

Clear. Lows in the 40s. Highs in the upper 70s.

Clear. Lows in the 40s. Highs in the upper 70s.

Clear. Lows in the 40s. Highs in the upper 70s.

Mostly clear. Low temperature around 49F. Dew point will be around 44F with an average humidity of 60%. Winds will be 5 mph from the W.

Sunny. High temperature around 77F. Dew point will be around 50F with an average humidity of 55%. Winds will be 4 mph from the W.

Mostly clear. Low temperature around 49F. Dew point will be around 47F with an average humidity of 75%. Winds will be 8 mph from the W.

Sunny. High temperature around 71F. Dew point will be around 51F with an average humidity of 60%. Winds will be 7 mph from the W.

Clear. Low temperature around 47F. Dew point will be around 48F with an average humidity of 81%. Winds will be 9 mph from the W.

Sunny. High temperature around 68F. Dew point will be around 50F with an average humidity of 63%. Winds will be 7 mph from the W.

Clear. Low temperature around 46F. Dew point will be around 47F with an average humidity of 80%. Winds will be 8 mph from the W.