10-Day Weather Forecast - Port Costa, CA

Sunny in the morning then becoming mostly cloudy. Highs in the lower 80s. Northeast winds up to 5 mph. . . Becoming west in the afternoon.

Mostly cloudy. Lows in the lower 50s. Southwest winds 5 to 10 mph.

Mostly cloudy. Highs in the upper 60s. Southwest winds around 5 mph. . . Becoming west 10 to 15 mph in the afternoon.

Partly cloudy in the evening then becoming mostly cloudy. Lows in the upper 40s. Southwest winds 5 to 10 mph.

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

Partly cloudy. Lows in the mid 40s. Highs in the upper 60s.

Partly cloudy. Lows in the mid 40s. Highs in the upper 60s.

Mostly cloudy. Lows in the upper 40s.

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

Mostly clear. Lows in the 40s.

Clear. Highs in the upper 60s. Lows in the upper 40s.

Clear. Highs in the upper 60s. Lows in the upper 40s.

Sunny. Highs around 70.

Clear. Low temperature around 47F. Dew point will be around 39F with an average humidity of 61%. Winds will be 5 mph from the NW.

Sunny. High temperature around 68F. Dew point will be around 43F with an average humidity of 50%. Winds will be 5 mph from the NW.

Mostly clear. Low temperature around 49F. Dew point will be around 43F with an average humidity of 67%. Winds will be 5 mph from the W.

Partly cloudy. High temperature around 67F. Dew point will be around 45F with an average humidity of 54%. Winds will be 5 mph from the NW.

Partly cloudy. Low temperature around 47F. Dew point will be around 43F with an average humidity of 68%. Winds will be 6 mph from the W.