Weather in Port Costa, CA
Updated 2026-08-11 10:45 local time · ZIP codes 94569
Sunny
No government weather alerts were returned for this location at the latest update.
Next hours
70°34% rain66°13% rain69°9% rain72°7% rain74°5% rain74°5% rain72°5% rain70°7% rain68°8% rain60°11% rain
58°13% rain59°10% rain3-day weather forecast
Weather details
Sunrise, sunset and moon
Weather insights for today
Rain chance stays relatively low over the next 12 hours (up to 24%).
It feels like 70°F with winds near 5 mph.
70°F, 7% rain chance and 11 mph wind.
Visibility is around 10 mi; gusts may reach 14 mph.
Current temperature is 70°F, wind 5 mph, rain chance up to 24%.
UV index is 4. Sunscreen and sunglasses are sensible for longer outdoor time.
Port Costa weather today
Sunny and 70°F in Port Costa, CA. Today's high is 74°F with a 17% rain chance. Winds are around 5 mph with gusts near 6 mph. Relative humidity is 56%, pressure is 29.95 inHg, and visibility is about 10 miles.
Tonight and tomorrow in Port Costa
Sunrise is at 06:20 AM and sunset is at 08:07 PM. Tomorrow's forecast calls for Sunny with a high near 72°F and a low near 57°F. The maximum rain chance is 10%.