Weather forecast for tomorrowPort Costa, CA
Weather forecast for tomorrow
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 ▼
Tomorrow, in Port Costa, sunlight and clouds will take turns dominating the sky.
Temperatures will oscillate between an enjoyable 66.2°F at their highest and a fresh 50°F at their lowest.
Forecast models suggest colder conditions, with a peak that mirrors November's climate average rather than October's.
Sunrise will be at 7:21 am and sunset at 6:25 pm; tomorrow's daylight will last for 11h and 4min.
Temperatures will oscillate between an enjoyable 66.2°F at their highest and a fresh 50°F at their lowest.
Forecast models suggest colder conditions, with a peak that mirrors November's climate average rather than October's.
Sunrise will be at 7:21 am and sunset at 6:25 pm; tomorrow's daylight will last for 11h and 4min.
Hourly overview
Hourly temperatures
Warmest hour: 3 pm 64°C.
Coldest period: 3 am - 6 am 54°C.
Coldest period: 3 am - 6 am 54°C.
Chance of precipitation
Highest chance: 12 am - 6 am 7%.
Hourly weather forecast
- 12 am
- 55°F
- Feels like:54°F
Mostly Clear
- Precip. probability: 7%
- Precipitation: 0"
- Wind: 11mphSW 233°
- Humidity: 84%
- Pressure: 29.97"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 2 am
- 54°F
- Feels like:52°F
Mostly Clear
- Precip. probability: 7%
- Precipitation: 0"
- Wind: 10mphWSW 238°
- Humidity: 85%
- Pressure: 29.97"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 4 am
- 54°F
- Feels like:50°F
Partly Cloudy
- Precip. probability: 7%
- Precipitation: 0"
- Wind: 10mphWSW 245°
- Humidity: 85%
- Pressure: 29.94"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 6 am
- 54°F
- Feels like:50°F
Partly Cloudy
- Precip. probability: 7%
- Precipitation: 0"
- Wind: 10mphWSW 245°
- Humidity: 83%
- Pressure: 29.94"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
Sunrise: 7:21 am
- 8 am
- 54°F
- Feels like:50°F
Partly Cloudy
- Precip. probability: 7%
- Precipitation: 0"
- Wind: 10mphWSW 246°
- Humidity: 81%
- Pressure: 29.97"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 10 am
- 57°F
- Feels like:55°F
Partly Cloudy
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 12mphWSW 250°
- Humidity: 70%
- Pressure: 29.97"Hg
- Visibility: 10mi
- UV index: 2
- details ▼
- 12 pm
- 63°F
- Feels like:61°F
Mostly Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 12mphWSW 251°
- Humidity: 54%
- Pressure: 29.94"Hg
- Visibility: 10mi
- UV index: 4
- details ▼
- 2 pm
- 64°F
- Feels like:63°F
Mostly Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 14mphWSW 248°
- Humidity: 49%
- Pressure: 29.91"Hg
- Visibility: 10mi
- UV index: 4
- details ▼
- 4 pm
- 64°F
- Feels like:63°F
Cloudy
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 14mphWSW 250°
- Humidity: 48%
- Pressure: 29.88"Hg
- Visibility: 10mi
- UV index: 1
- details ▼
- 6 pm
- 61°F
- Feels like:59°F
Cloudy
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 13mphW 259°
- Humidity: 57%
- Pressure: 29.88"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
Sunset: 6:25 pm
- 8 pm
- 57°F
- Feels like:55°F
Cloudy
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 10mphWSW 256°
- Humidity: 66%
- Pressure: 29.88"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 10 pm
- 55°F
- Feels like:54°F
Cloudy
- Precip. probability: 18%
- Precipitation: 0"
- Wind: 9mphWSW 246°
- Humidity: 72%
- Pressure: 29.88"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
Tomorrow, on Monday, a combination of dull and bright weather is predicted.
The temperature will be between the lowest temperature of 53.6°F and the highest temperature of 64.4°F. The warmest part of the day will be from 1 pm to 4 pm.
The temperature will be more consistent with what’s typical for November than the usual maximum in October. The lowest temperature is expected to be relatively lower than the average minimum in October, typically 54°F.
The temperature will be between the lowest temperature of 53.6°F and the highest temperature of 64.4°F. The warmest part of the day will be from 1 pm to 4 pm.
The temperature will be more consistent with what’s typical for November than the usual maximum in October. The lowest temperature is expected to be relatively lower than the average minimum in October, typically 54°F.
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
On Monday, a pleasant mix of sun and clouds will define the day.
Tomorrow, the maximum temperature in Port Costa will be 66.2°F, while the minimum temperature will be 50°F.
The maximum temperature will be a couple of degrees lower than the average highest temperature of 72.9°F in October. The lowest temperature will be also a few degrees lower than the average low of 54°F.
The maximum temperature will be a couple of degrees lower than the average highest temperature of 72.9°F in October. The lowest temperature will be also a few degrees lower than the average low of 54°F.
On Monday, in Port Costa, sunrise will be at 7:21 am and sunset at 6:25 pm (PDT).
In Port Costa, tomorrow, there will be 11h and 4min of daylight.
