Weather forecast for 10 daysPort Costa, CA
Weather forecast for the weekend
Sunday Oct 18, 2026
- 73°F
- 52°F
Sunny
- Precip. probability: 15%
- Precipitation: 0"
- Wind: 14mphWSW 239°
- Humidity: 66%
- UV index: 5
- Sunrise: 7:20 am PDT
- Sunset: 6:27 pm PDT
- details ▼
On Sunday, in Port Costa, sunshine is forecasted under mostly clear skies.
The maximum predicted temperature is a warm 73.4°F, while the minimum temperature will be a crisp 51.8°F.
The highest temperature for today is predicted to reflect October's average of 72.9°F.
Sunrise will be at 7:20 am and sunset at 6:27 pm; the daylight will last for 11h and 7min.
The maximum predicted temperature is a warm 73.4°F, while the minimum temperature will be a crisp 51.8°F.
The highest temperature for today is predicted to reflect October's average of 72.9°F.
Sunrise will be at 7:20 am and sunset at 6:27 pm; the daylight will last for 11h and 7min.
10-day overview
Daily temperatures
Warmest day: today 73°C.
Minimum temperature: 66°C.
Minimum temperature: 66°C.
Chance of precipitation
Highest chance: Wednesday 51%.
Long-term weather forecast
- Sunday
- Oct 18, 2026
- 73°F
- 52°F
Sunny
- Precip. probability: 15%
- Precipitation: 0"
- Wind: 14mphWSW 239°
- Humidity: 66%
- UV index: 5
- Sunrise: 7:20 am PDT
- Sunset: 6:27 pm PDT
- details ▼
- Monday
- Oct 19, 2026
- 66°F
- 50°F
Partly Cloudy
- Precip. probability: 7%
- Precipitation: 0"
- Wind: 14mphWSW 251°
- Humidity: 61%
- UV index: 5
- Sunrise: 7:21 am PDT
- Sunset: 6:25 pm PDT
- details ▼
- Tuesday
- Oct 20, 2026
- 70°F
- 54°F
Cloudy
- Precip. probability: 21%
- Precipitation: 0.12"
- Wind: 6mphWNW 301°
- Humidity: 63%
- UV index: 3
- Sunrise: 7:22 am PDT
- Sunset: 6:24 pm PDT
- details ▼
- Wednesday
- Oct 21, 2026
- 66°F
- 54°F
AM Showers
- Precip. probability: 51%
- Precipitation: 0.12"
- Wind: 7mphSW 220°
- Humidity: 73%
- UV index: 2
- Sunrise: 7:23 am PDT
- Sunset: 6:23 pm PDT
- details ▼
- Thursday
- Oct 22, 2026
- 68°F
- 50°F
Mostly Cloudy
- Precip. probability: 24%
- Precipitation: 0"
- Wind: 11mphSW 235°
- Humidity: 76%
- UV index: 3
- Sunrise: 7:24 am PDT
- Sunset: 6:21 pm PDT
- details ▼
- Friday
- Oct 23, 2026
- 72°F
- 48°F
Mostly Sunny
- Precip. probability: 21%
- Precipitation: 0"
- Wind: 8mphWSW 245°
- Humidity: 69%
- UV index: 4
- Sunrise: 7:25 am PDT
- Sunset: 6:20 pm PDT
- details ▼
- Saturday
- Oct 24, 2026
- 72°F
- 48°F
Partly Cloudy
- Precip. probability: 6%
- Precipitation: 0"
- Wind: 8mphSSW 213°
- Humidity: 60%
- UV index: 4
- Sunrise: 7:26 am PDT
- Sunset: 6:19 pm PDT
- details ▼
- Sunday
- Oct 25, 2026
- 70°F
- 48°F
AM Showers
- Precip. probability: 31%
- Precipitation: 0.04"
- Wind: 10mphSW 234°
- Humidity: 59%
- UV index: 4
- Sunrise: 7:27 am PDT
- Sunset: 6:17 pm PDT
- details ▼
- Monday
- Oct 26, 2026
- 68°F
- 46°F
Partly Cloudy
- Precip. probability: 17%
- Precipitation: 0"
- Wind: 9mphSW 234°
- Humidity: 60%
- UV index: 4
- Sunrise: 7:28 am PDT
- Sunset: 6:16 pm PDT
- details ▼
- Tuesday
- Oct 27, 2026
- 68°F
- 46°F
Partly Cloudy
- Precip. probability: 10%
- Precipitation: 0"
- Wind: 8mphSSW 210°
- Humidity: 60%
- UV index: 4
- Sunrise: 7:29 am PDT
- Sunset: 6:15 pm PDT
- details ▼
Over the next ten days, a mix of cloud-filled, bright and wet weather is anticipated.
Rain is predicted for Tuesday, Wednesday and next Sunday. The days with the most rainfall will be Tuesday and Wednesday, with minimal precipitation of 0.12".
In the upcoming days, the highest temperature will vary between 66.2°F and 73.4°F, while the minimum temperature is forecast to range between 46.4°F and 53.6°F.
With a high of 73.4°F, today is the warmest day; Monday and Wednesday, with the highest temperature of 66.2°F, will be the coldest days in Port Costa.
Rain is predicted for Tuesday, Wednesday and next Sunday. The days with the most rainfall will be Tuesday and Wednesday, with minimal precipitation of 0.12".
In the upcoming days, the highest temperature will vary between 66.2°F and 73.4°F, while the minimum temperature is forecast to range between 46.4°F and 53.6°F.
With a high of 73.4°F, today is the warmest day; Monday and Wednesday, with the highest temperature of 66.2°F, will be the coldest days in Port Costa.
Updated: Oct 18, 2026 @ 12:29:40 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Frequently asked questions
Today, bright and sunny weather is expected.
Today, the highest temperature will be 73.4°F, while the lowest temperature will be 51.8°F.
Today, the highest temperature will be in line with the average maximum temperature in October. The lowest temperature will be also in line with the average low of 54°F.
Today, the highest temperature will be in line with the average maximum temperature in October. The lowest temperature will be also in line with the average low of 54°F.
On Sunday, in Port Costa, sunrise will be at 7:20 am and sunset at 6:27 pm (PDT).
In Port Costa, the length of the day today will be 11h and 7min.
