Weather in Port Costa, CA
Updated 2026-09-26 07:00 local time · ZIP codes 94569
Overcast
No government weather alerts were returned for this location at the latest update.
Next hours
57°25% rain58°24% rain59°20% rain62°16% rain64°14% rain66°12% rain68°11% rain68°11% rain68°12% rain67°11% rain
66°4% rain
64°4% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Key weather changes ahead
Weather insights for today
Rain chance stays relatively low over the next 12 hours (up to 25%).
It feels like 55°F with winds near 5 mph.
66°F, 4% rain chance and 11 mph wind.
Visibility is around 6 mi; gusts may reach 14 mph.
Current temperature is 57°F, wind 5 mph, rain chance up to 25%.
UV index is 0.
Local weather characteristics in Port Costa
California weather varies from cool marine conditions along parts of the Pacific coast to hot inland valleys, deserts and snowy mountain climates. Short distances can produce large temperature differences.
Port Costa is part of the West weather region. The forecast point is near 38.04°N latitude and 122.19°W longitude. Local temperature, wind and precipitation can still differ from nearby places, especially where terrain, coastlines or urban development create small-scale weather changes.
Port Costa weather today
Overcast and 57°F in Port Costa, CA. Today's high is 68°F with a 14% rain chance. Winds are around 5 mph with gusts near 7 mph. Relative humidity is 82%, pressure is 29.92 inHg, and visibility is about 6 miles.
Tonight and tomorrow in Port Costa
Sunrise is at 07:00 AM and sunset is at 07:00 PM. Tomorrow's forecast calls for Sunny with a high near 68°F and a low near 58°F. The maximum rain chance is 9%.