Port Costa, California 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Clear 82°F 28°C Heat Index: 81°F	Observed at: Port Costa, CA	Elevation: 305 ft | 93 m
	Last Updated: July 29, 5:30 PM Timezone: GMT -5/-4
	Sky Conditions: Clear	Temperature: 82°F | 28°C
	Pressure: 29.5 in | 998.9 mb	Dewpoint: 54°F | 12°C
	Humidity: 39%	Wind: W 12 mph | W 19 kph
	Feels Like: 78°F | 26°C	Visibility: 100.9 mi | 162.4 km
	Lat/Long: 38.0491 | -122.2011	Sunrise: 6:09 AM   Sunset: 8:20 PM

7 Day Graphical Forecast

Valid: 5:30 PM 7/29/2026

Today Mostly Clear 83 |57 °F 28 |14 °C 0% Chance Precipitation Thursday Clear 88 |57 °F 31 |14 °C 0% Chance Precipitation Friday Clear 82 |55 °F 28 |13 °C 0% Chance Precipitation Saturday Clear 83 |59 °F 29 |15 °C 0% Chance Precipitation Sunday Clear 85 |60 °F 29 |16 °C 0% Chance Precipitation Monday Clear 90 |61 °F 32 |16 °C 0% Chance Precipitation Tuesday Clear 88 |63 °F 31 |17 °C 0% Chance Precipitation

7 Hour Graphical Forecast

Valid: 5:30 PM 7/29/2026

5 PM Clear 82 °F 0% Chance Precipitation

6 PM Clear 81 °F 0% Chance Precipitation

7 PM Clear 78 °F 0% Chance Precipitation

8 PM Clear 73 °F 0% Chance Precipitation

9 PM Clear 69 °F 0% Chance Precipitation

10 PM Clear 68 °F 0% Chance Precipitation

11 PM Clear 66 °F 0% Chance Precipitation

7 Day Textual Forecast - with QPF, Max Wind, Humidity, Snowfall & UV Index

7 Day & Night Weather Forecast for Port Costa, CA - (Fahrenheit & Celsius) Valid: 5:30 PM 7/29/2026 Today Mostly Clear with a high near 83°F [28°C]. W wind to around 12 mph [19 kph], with gusts to near 18 mph [29 kph]. Dewpoint near 54°F [12°C] with humidity of 90%. Pressure around 29.50 in [998.9 mb]. UV Index: 8.1. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Tonight Mostly Clear with a low around 57°F [14°C]. W wind to around 12 mph [19 kph], with gusts to near 18 mph [29 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Thursday Clear with a high near 88°F [31°C]. W wind to around 13 mph [21 kph], with gusts to near 19 mph [30 kph]. Dewpoint near 54°F [12°C] with humidity of 68%. Pressure around 29.50 in [998.9 mb]. UV Index: 8.2. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Thursday Night Clear with a low around 57°F [14°C]. W wind to around 13 mph [21 kph], with gusts to near 19 mph [30 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Friday Clear with a high near 82°F [28°C]. WSW wind to around 10 mph [15 kph], with gusts to near 15 mph [24 kph]. Dewpoint near 54°F [12°C] with humidity of 71%. Pressure around 29.50 in [998.9 mb]. UV Index: 8.2. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Friday Night Clear with a low around 55°F [13°C]. WSW wind to around 10 mph [15 kph], with gusts to near 15 mph [24 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Saturday Clear with a high near 83°F [29°C]. SW wind to around 10 mph [16 kph], with gusts to near 14 mph [22 kph]. Dewpoint near 54°F [12°C] with humidity of 82%. Pressure around 29.50 in [998.9 mb]. UV Index: 8.1. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Saturday Night Clear with a low around 59°F [15°C]. SW wind to around 10 mph [16 kph], with gusts to near 14 mph [22 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Sunday Clear with a high near 85°F [29°C]. SW wind to around 9 mph [15 kph], with gusts to near 16 mph [26 kph]. Dewpoint near 54°F [12°C] with humidity of 81%. Pressure around 29.50 in [998.9 mb]. UV Index: 8.1. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Sunday Night Clear with a low around 60°F [16°C]. SW wind to around 9 mph [15 kph], with gusts to near 16 mph [26 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Monday Clear with a high near 90°F [32°C]. SW wind to around 9 mph [14 kph], with gusts to near 15 mph [25 kph]. Dewpoint near 54°F [12°C] with humidity of 71%. Pressure around 29.50 in [998.9 mb]. UV Index: 7.95. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Monday Night Clear with a low around 61°F [16°C]. SW wind to around 9 mph [14 kph], with gusts to near 15 mph [25 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Tuesday Clear with a high near 88°F [31°C]. SW wind to around 12 mph [19 kph], with gusts to near 19 mph [31 kph]. Dewpoint near 54°F [12°C] with humidity of 68%. Pressure around 29.50 in [998.9 mb]. UV Index: 7.95. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Tuesday Night Clear with a low around 63°F [17°C]. SW wind to around 12 mph [19 kph], with gusts to near 19 mph [31 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm].

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7 Day and Night - QPF Forecast for Port Costa, CA

Today: 0.0 mm | 0.00 in

Tonight: 0.0 mm | 0.00 in

Thursday: 0.0 mm | 0.00 in

Thursday Night: 0.0 mm | 0.00 in

Friday: 0.0 mm | 0.00 in

Friday Night: 0.0 mm | 0.00 in

Saturday: 0.0 mm | 0.00 in

Saturday Night: 0.0 mm | 0.00 in

Sunday: 0.0 mm | 0.00 in

Sunday Night: 0.0 mm | 0.00 in

Monday: 0.0 mm | 0.00 in

Monday Night: 0.0 mm | 0.00 in

Tuesday: 0.0 mm | 0.00 in

Tuesday Night: 0.0 mm | 0.00 in

7 Day and Night - Maximum Wind Speed Forecast for Port Costa, CA

Today: W @ 19 kph | 12 mph

Tonight: W @ 19 kph | 12 mph

Thursday: W @ 21 kph | 13 mph

Thursday Night: W @ 21 kph | 13 mph

Friday: WSW @ 15 kph | 10 mph

Friday Night: WSW @ 15 kph | 10 mph

Saturday: SW @ 16 kph | 10 mph

Saturday Night: SW @ 16 kph | 10 mph

Sunday: SW @ 15 kph | 9 mph

Sunday Night: SW @ 15 kph | 9 mph

Monday: SW @ 14 kph | 9 mph

Monday Night: SW @ 14 kph | 9 mph

Tuesday: SW @ 19 kph | 12 mph

Tuesday Night: SW @ 19 kph | 12 mph

7 Day and Night - Maximum Humidity Forecast for Port Costa, CA

Today: 90 %

Tonight: 90 %

Thursday: 68 %

Thursday Night: 68 %

Friday: 71 %

Friday Night: 71 %

Saturday: 82 %

Saturday Night: 82 %

Sunday: 81 %

Sunday Night: 81 %

Monday: 71 %

Monday Night: 71 %

Tuesday: 68 %

Tuesday Night: 68 %

7 Day and Night - Snowfall Totals Forecast for Port Costa, CA

Today: 0.0 cm | 0.00 in

Tonight: 0.0 cm | 0.00 in

Thursday: 0.0 cm | 0.00 in

Thursday Night: 0.0 cm | 0.00 in

Friday: 0.0 cm | 0.00 in

Friday Night: 0.0 cm | 0.00 in

Saturday: 0.0 cm | 0.00 in

Saturday Night: 0.0 cm | 0.00 in

Sunday: 0.0 cm | 0.00 in

Sunday Night: 0.0 cm | 0.00 in

Monday: 0.0 cm | 0.00 in

Monday Night: 0.0 cm | 0.00 in

Tuesday: 0.0 cm | 0.00 in

Tuesday Night: 0.0 cm | 0.00 in

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