10-Day Weather Forecast - Port Costa, CA

Mostly cloudy. Patchy fog in the morning. Highs in the upper 60s. West winds 5 to 10 mph.

Partly cloudy. Patchy fog after midnight. Lows in the upper 40s. West winds around 5 mph in the evening. . . Becoming light.

Mostly cloudy in the morning then becoming partly cloudy. Patchy fog in the morning. Highs around 70. North winds 5 to 10 mph.

Partly cloudy. Lows in the upper 40s. Northwest winds around 5 mph in the evening. . . Becoming light.

Mostly cloudy. Highs in the lower 70s.

Mostly cloudy. Lows near 50. Highs in the lower 70s.

Mostly cloudy. Lows near 50. Highs in the lower 70s.

Mostly cloudy. Lows near 50. Highs in the lower 70s.

Mostly cloudy in the morning then becoming partly cloudy. Highs in the upper 60s.

Partly cloudy. A slight chance of rain. Lows in the upper 40s.

Mostly cloudy in the morning then becoming sunny. Highs in the upper 60s.

Mostly clear. Lows in the mid to upper 40s. Highs in the lower 70s.

Mostly clear. Lows in the mid to upper 40s. Highs in the lower 70s.

Clear. Low temperature around 46F. Dew point will be around 46F with an average humidity of 88%. Winds will be 6 mph from the SW.

Mostly sunny. High temperature around 59F. Dew point will be around 48F with an average humidity of 72%. Winds will be 6 mph from the W.

Mostly clear. Low temperature around 45F. Dew point will be around 44F with an average humidity of 85%. Winds will be 6 mph from the SW.

Sunny. High temperature around 59F. Dew point will be around 44F with an average humidity of 66%. Winds will be 5 mph from the NW.

Clear. Low temperature around 44F. Dew point will be around 40F with an average humidity of 73%. Winds will be 5 mph from the W.