Weather forecast for todayPort Costa, CA

Weather forecast for today

Current condition 1:48 pm PDT

  • 81°F
  • Feels like:
    81°F
Sunny
Sunny
  • Precipitation: 0"
  • Wind: 7mphENE 60°
  • Humidity: 28%
  • Dewpoint: 45°F
  • Pressure: 30.02"Hg
  • Visibility: 9mi
  • UV index: 5
  • ▼
In Port Costa, at the moment, the sun is shining uninterrupted, making for an excellent day outdoors.
The temperature is a warm 80.6°F. The current temperature is only a few degrees off the highest temperature for today.

Saturday Oct 17, 2026

  • 86°F
  • 54°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 7mphSSW 201°
  • Humidity: 26%
  • UV index: 5
  • Sunrise: 7:19 am PDT
  • Sunset: 6:28 pm PDT
  • ▼
Today, on Saturday, October 17, sunny conditions are expected to continue.
Temperature values will vary noticeably, extending from a humid 86°F to a fresh 53.6°F.
Temperatures are higher than average, more in line with September's norm of 80.1°F than with October's 72.9°F.
Sunrise was at 7:19 am and sunset will be at 6:28 pm; the daylight will last for 11h and 9min.

Hourly overview

Hourly temperatures

Warmest hour: 5 pm 86°C.
Coldest hour: 11 pm 63°C.

Chance of precipitation

Highest chance: 10 pm - 11 pm 1%.

Hourly weather forecast

  • 2 pm
  • 81°F
  • Feels like:
    81°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 7mphE 82°
  • Humidity: 26%
  • Pressure: 30"Hg
  • Visibility: 10mi
  • UV index: 4
  • ▼
  • 3 pm
  • 84°F
  • Feels like:
    84°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 6mphESE 107°
  • Humidity: 24%
  • Pressure: 29.97"Hg
  • Visibility: 10mi
  • UV index: 3
  • ▼
  • 4 pm
  • 84°F
  • Feels like:
    84°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 6mphSW 231°
  • Humidity: 23%
  • Pressure: 29.94"Hg
  • Visibility: 10mi
  • UV index: 2
  • ▼
  • 5 pm
  • 86°F
  • Feels like:
    86°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 7mphWSW 241°
  • Humidity: 23%
  • Pressure: 29.94"Hg
  • Visibility: 10mi
  • UV index: 1
  • ▼
  • 6 pm
  • 82°F
  • Feels like:
    82°F
Sunny
Sunny
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 7mphWSW 255°
  • Humidity: 28%
  • Pressure: 29.94"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
Sunset: 6:28 pm
  • 7 pm
  • 75°F
  • Feels like:
    75°F
Clear
Clear
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 7mphWSW 253°
  • Humidity: 36%
  • Pressure: 29.94"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 8 pm
  • 72°F
  • Feels like:
    72°F
Clear
Clear
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 6mphWSW 257°
  • Humidity: 43%
  • Pressure: 29.94"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 9 pm
  • 68°F
  • Feels like:
    68°F
Clear
Clear
  • Precip. probability: 0%
  • Precipitation: 0"
  • Wind: 6mphWSW 240°
  • Humidity: 52%
  • Pressure: 29.97"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 10 pm
  • 64°F
  • Feels like:
    64°F
Clear
Clear
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 6mphWSW 237°
  • Humidity: 61%
  • Pressure: 29.97"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
  • 11 pm
  • 63°F
  • Feels like:
    63°F
Clear
Clear
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 5mphSW 225°
  • Humidity: 63%
  • Pressure: 29.97"Hg
  • Visibility: 10mi
  • UV index: 0
  • ▼
For the rest of Saturday, sunshine is expected.
The temperature will vary between a maximum of 86°F and a minimum of 62.6°F. The hottest part of the day is anticipated around 5 pm.
Today, the temperature will be closer to September's norm than to October's average of 72.9°F. The temperature low is forecasted to be comparable to the usual October value of 54°F.
Updated: Oct 17, 2026 @ 20:48:08 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

The temperature at 1:48 pm PDT is 80.6°F.

On Saturday, sunshine is expected with little to no cloud cover.

Today, the highest temperature will be 86°F, while the lowest temperature will be 53.6°F.
The highest temperature will be uncommonly higher than the average maximum of 72.9°F in October. Today, the lowest temperature will be in line with the average low temperature.

On Saturday, in Port Costa, sunrise was at 7:19 am and sunset will be at 6:28 pm (PDT).

In Port Costa, today, there will be 11h and 9min of daylight.