Current Conditions

Walnut Creek, California

65°F18°C
Clear

Wind

SW 6 mph10 km/h

Humidity

70%

Cloud Cover

58%

As of Tuesday, September 22, 2026 at 11:46 AM PDT

Today's Outlook

Day

Mostly clear and warm, with a high of 73°F23°C and morning low of 65°F18°C. Breezy from the WSW at 8 to 9 mph12 to 14 km/h.

Night

Mostly clear, with a low around 59°F15°C. Light wind from the SW around 6 mph9 km/h.

7-Day Forecast

DayConditionHigh (°F)Low (°F)Precip (mm)Cloud Cover (%)Wind (mph)
ClearHigh 73°F23°CLow 59°F15°CPrecip 0 in0 mmCloud 17%Wind SW 7 mph11 km/hTuesday: Mostly clear and warm, with a high of 73°F23°C and morning low of 65°F18°C. Breezy from the WSW at 8 to 9 mph12 to 14 km/h. Tuesday Night: Mostly clear, with a low around 59°F15°C. Light wind from the SW around 6 mph9 km/h.
ClearHigh 85°F29°CLow 55°F13°CPrecip 0 in0 mmCloud 30%Wind WSW 3 mph5 km/hWednesday: Partly cloudy and warm, with a high of 85°F29°C and morning low of 57°F14°C. Light wind from the WNW around 3 mph4 km/h. Wednesday Night: Partly cloudy, with a low around 55°F13°C. Light wind from the SW around 4 mph6 km/h.
Partly CloudyHigh 83°F29°CLow 57°F14°CPrecip 0 in0 mmCloud 51%Wind SW 5 mph8 km/hThursday: Mostly cloudy and warm, with a high of 83°F29°C and morning low of 58°F15°C. Breezy from the WSW at 5 to 9 mph9 to 15 km/h. Thursday Night: Partly cloudy, with a low around 57°F14°C. Breezy from the SW at 5 to 7 mph8 to 11 km/h.
ClearHigh 79°F26°CLow 59°F15°CPrecip 0 in0 mmCloud 26%Wind WSW 7 mph11 km/hFriday: Mostly clear and warm, with a high of 79°F26°C and morning low of 61°F16°C. Breezy from the WSW at 8 to 10 mph13 to 15 km/h. Friday Night: Partly cloudy, with a low around 59°F15°C. Light wind from the SW around 6 mph9 km/h.
ClearHigh 77°F25°CLow 54°F12°CPrecip 0 in0 mmCloud 38%Wind WSW 5 mph8 km/hSaturday: Partly cloudy and warm, with a high of 77°F25°C and morning low of 56°F13°C. Breezy from the WSW at 5 to 8 mph8 to 13 km/h. Saturday Night: Partly cloudy, with a low around 54°F12°C. Light wind from the SW around 5 mph8 km/h.
ClearHigh 74°F24°CLow 55°F13°CPrecip 0 in0.1 mm4%Cloud 40%Wind WSW 7 mph11 km/hSunday: Partly cloudy and warm, with a high of 74°F24°C and morning low of 57°F14°C. Breezy from the WSW at 7 to 9 mph12 to 14 km/h. Sunday Night: Partly cloudy, with a low around 55°F13°C. Light wind from the SW around 6 mph9 km/h.
ClearHigh 77°F25°CLow 55°F13°CPrecip 0 in0 mmCloud 26%Wind WSW 5 mph8 km/hMonday: Partly cloudy and warm, with a high of 77°F25°C and morning low of 56°F13°C. Breezy from the WSW at 5 to 7 mph8 to 12 km/h. Monday Night: Partly cloudy, with a low around 55°F13°C. Light wind from the SW around 5 mph8 km/h.

15-Day Forecast

Day High Low Precip Cloud Cover Condition Wind
TuesdaySep 2273°F23°C59°F15°C0 in0 mm· —17%ClearSW 7 mph11 km/h
WednesdaySep 2385°F29°C55°F13°C0 in0 mm· —30%ClearWSW 3 mph5 km/h
ThursdaySep 2483°F29°C57°F14°C0 in0 mm· —51%Partly CloudySW 5 mph8 km/h
FridaySep 2579°F26°C59°F15°C0 in0 mm· —26%ClearWSW 7 mph11 km/h
SaturdaySep 2677°F25°C54°F12°C0 in0 mm· —38%ClearWSW 5 mph8 km/h
SundaySep 2774°F24°C55°F13°C0 in0.1 mm· 4%40%ClearWSW 7 mph11 km/h
MondaySep 2877°F25°C55°F13°C0 in0 mm· —26%ClearWSW 5 mph8 km/h
TuesdaySep 2979°F26°C55°F13°C0.01 in0.2 mm· 2%24%ClearWSW 5 mph8 km/h
WednesdaySep 3079°F26°C57°F14°C0 in0.1 mm· 2%28%ClearWSW 5 mph8 km/h
ThursdayOct 179°F26°C57°F14°C0 in0.1 mm· 2%32%ClearWSW 6 mph9 km/h
FridayOct 282°F28°C57°F14°C0.01 in0.2 mm· 2%19%ClearWSW 5 mph8 km/h
SaturdayOct 383°F29°C58°F14°C0 in0.1 mm· 1%24%ClearWSW 4 mph7 km/h
SundayOct 481°F27°C58°F15°C0.02 in0.4 mm· 4%25%ClearWSW 5 mph7 km/h
MondayOct 582°F28°C58°F15°C0.01 in0.3 mm· 4%22%ClearWSW 4 mph7 km/h
TuesdayOct 682°F28°C59°F15°C0.01 in0.2 mm· 3%25%ClearWSW 5 mph7 km/h

Nearby Cities

About This Forecast

This forecast is powered by WeatherMesh, the world's most advanced and accurate weather model powered by AI. WeatherMesh is built on proprietary data from WindBorne's Global Sounding Balloon constellation — the world's largest fleet of autonomous, long-duration weather balloons — collecting observations across 100% of Earth, including over oceans and remote regions where no other data exists.

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Coordinates: 37.9063°N, 122.0650°W·Elevation: 52m·Timezone: America/Los_Angeles·Population: 68,910