Current Conditions

Walnut, California

66°F19°C

Clear

Wind

SE 1 mph2 km/h

Humidity

58%

Cloud Cover

As of Wednesday, September 2, 2026 at 8:40 AM PDT

Today's Outlook

Day

Mostly clear and warm, with a high of 81°F27°C and morning low of 66°F19°C. Breezy from the SW at 5 to 8 mph9 to 12 km/h. Dry air.

Night

Mostly clear, with a low around 61°F16°C. Light wind from the SSW around 2 mph4 km/h.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Clear	High 81°F27°C	Low 61°F16°C	Precip 0 in0 mm—	Cloud 2%	Wind SSW 4 mph7 km/h	Wednesday: Mostly clear and warm, with a high of 81°F27°C and morning low of 66°F19°C. Breezy from the SW at 5 to 8 mph9 to 12 km/h. Dry air. Wednesday Night: Mostly clear, with a low around 61°F16°C. Light wind from the SSW around 2 mph4 km/h.
Clear	High 80°F27°C	Low 62°F16°C	Precip 0 in0 mm—	Cloud 3%	Wind SSW 4 mph6 km/h	Thursday: Mostly clear and warm, with a high of 80°F27°C and morning low of 66°F19°C. Breezy from the SSW at 6 to 8 mph9 to 12 km/h. Thursday Night: Mostly clear, with a low around 62°F16°C. Light wind from the S around 2 mph4 km/h.
Clear	High 81°F27°C	Low 63°F17°C	Precip 0 in0 mm—	Cloud 10%	Wind SSW 4 mph6 km/h	Friday: Mostly clear and warm, with a high of 81°F27°C and morning low of 66°F19°C. Breezy from the SSW at 5 to 7 mph8 to 12 km/h. Friday Night: Mostly clear, with a low around 63°F17°C. Light wind from the SSW around 2 mph3 km/h.
Clear	High 86°F30°C	Low 62°F17°C	Precip 0 in0.1 mm4%	Cloud 8%	Wind SSW 3 mph5 km/h	Saturday: Mostly clear and warm, with a high of 86°F30°C and morning low of 68°F20°C. Breezy from the SSW at 5 to 7 mph8 to 11 km/h. Dry air. Saturday Night: Mostly clear, with a low around 62°F17°C. Light wind from the W around 2 mph3 km/h.
Drizzle	High 84°F29°C	Low 68°F20°C	Precip 0.09 in2.2 mm22%	Cloud 21%	Wind SW 3 mph5 km/h	Sunday: Mostly clear and warm, with a high of 84°F29°C and morning low of 70°F21°C. Breezy from the SW at 5 to 7 mph8 to 11 km/h. 22% chance of drizzle throughout the day. Sunday Night: Mostly clear, with a low around 68°F20°C. Light wind from the W around 2 mph3 km/h. 17% chance of drizzle before dawn.
Clear	High 86°F30°C	Low 64°F18°C	Precip 0 in0.1 mm3%	Cloud 14%	Wind SW 3 mph6 km/h	Monday: Mostly clear and hot, with a high of 86°F30°C and morning low of 70°F21°C. Breezy from the SW at 5 to 7 mph8 to 11 km/h. Monday Night: Mostly clear, with a low around 64°F18°C. Light wind from the ENE around 2 mph3 km/h.
Clear	High 87°F31°C	Low 64°F18°C	Precip 0.02 in0.5 mm4%	Cloud 24%	Wind SW 3 mph6 km/h	Tuesday: Mostly clear and hot, with a high of 87°F31°C and morning low of 69°F20°C. Breezy from the SW at 5 to 7 mph7 to 11 km/h. Tuesday Night: Mostly clear, with a low around 64°F18°C. Light wind from the SE around 2 mph4 km/h.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	WednesdaySep 2	81°F27°C	61°F16°C	0 in0 mm· —	2%	Clear	SSW 4 mph7 km/h
DayMostly clear and warm, with a high of 81°F27°C and morning low of 66°F19°C. Breezy from the SW at 5 to 8 mph9 to 12 km/h. Dry air. NightMostly clear, with a low around 61°F16°C. Light wind from the SSW around 2 mph4 km/h.
	ThursdaySep 3	80°F27°C	62°F16°C	0 in0 mm· —	3%	Clear	SSW 4 mph6 km/h
DayMostly clear and warm, with a high of 80°F27°C and morning low of 66°F19°C. Breezy from the SSW at 6 to 8 mph9 to 12 km/h. NightMostly clear, with a low around 62°F16°C. Light wind from the S around 2 mph4 km/h.
	FridaySep 4	81°F27°C	63°F17°C	0 in0 mm· —	10%	Clear	SSW 4 mph6 km/h
DayMostly clear and warm, with a high of 81°F27°C and morning low of 66°F19°C. Breezy from the SSW at 5 to 7 mph8 to 12 km/h. NightMostly clear, with a low around 63°F17°C. Light wind from the SSW around 2 mph3 km/h.
	SaturdaySep 5	86°F30°C	62°F17°C	0 in0.1 mm· 4%	8%	Clear	SSW 3 mph5 km/h
DayMostly clear and warm, with a high of 86°F30°C and morning low of 68°F20°C. Breezy from the SSW at 5 to 7 mph8 to 11 km/h. Dry air. NightMostly clear, with a low around 62°F17°C. Light wind from the W around 2 mph3 km/h.
	SundaySep 6	84°F29°C	68°F20°C	0.09 in2.2 mm· 22%	21%	Drizzle	SW 3 mph5 km/h
DayMostly clear and warm, with a high of 84°F29°C and morning low of 70°F21°C. Breezy from the SW at 5 to 7 mph8 to 11 km/h. 22% chance of drizzle throughout the day. NightMostly clear, with a low around 68°F20°C. Light wind from the W around 2 mph3 km/h. 17% chance of drizzle before dawn.
	MondaySep 7	86°F30°C	64°F18°C	0 in0.1 mm· 3%	14%	Clear	SW 3 mph6 km/h
DayMostly clear and hot, with a high of 86°F30°C and morning low of 70°F21°C. Breezy from the SW at 5 to 7 mph8 to 11 km/h. NightMostly clear, with a low around 64°F18°C. Light wind from the ENE around 2 mph3 km/h.
	TuesdaySep 8	87°F31°C	64°F18°C	0.02 in0.5 mm· 4%	24%	Clear	SW 3 mph6 km/h
DayMostly clear and hot, with a high of 87°F31°C and morning low of 69°F20°C. Breezy from the SW at 5 to 7 mph7 to 11 km/h. NightMostly clear, with a low around 64°F18°C. Light wind from the SE around 2 mph4 km/h.
	WednesdaySep 9	87°F31°C	66°F19°C	0.01 in0.3 mm· 3%	21%	Clear	SSW 3 mph5 km/h
DayMostly clear and hot, with a high of 87°F31°C and morning low of 71°F22°C. Breezy from the SW at 5 to 7 mph8 to 11 km/h. NightMostly clear, with a low around 66°F19°C. Light wind from the S around 2 mph3 km/h.
	ThursdaySep 10	86°F30°C	67°F19°C	0.03 in0.7 mm· 6%	21%	Clear	SSW 3 mph6 km/h
DayMostly clear and warm, with a high of 86°F30°C and morning low of 70°F21°C. Breezy from the SW at 5 to 7 mph8 to 11 km/h. NightMostly clear, with a low around 67°F19°C. Light wind from the S around 2 mph3 km/h.
	FridaySep 11	86°F30°C	66°F19°C	0.07 in1.7 mm· 9%	35%	Clear	SW 4 mph6 km/h
DayPartly cloudy and warm, with a high of 86°F30°C and morning low of 70°F21°C. Breezy from the SW at 5 to 7 mph8 to 11 km/h. NightPartly cloudy, with a low around 66°F19°C. Light wind from the SSW around 2 mph4 km/h.
	SaturdaySep 12	85°F29°C	67°F20°C	0.12 in3.1 mm· 10%	45%	Showers	SSW 4 mph6 km/h
DayPartly cloudy and warm, with a high of 85°F29°C and morning low of 71°F22°C. Breezy from the SSW at 5 to 7 mph8 to 11 km/h. 10% chance of showers throughout the day. NightPartly cloudy, with a low around 67°F20°C. Light wind from the S around 2 mph4 km/h.
	SundaySep 13	83°F29°C	67°F20°C	0.12 in3 mm· 20%	41%	Showers	SSW 4 mph6 km/h
DayPartly cloudy and warm, with a high of 83°F29°C and morning low of 71°F22°C. Light wind from the SSW around 5 mph8 km/h. 20% chance of drizzle throughout the day. NightPartly cloudy, with a low around 67°F20°C. Light wind from the SSW around 2 mph4 km/h. 15% chance of showers throughout the night.
	MondaySep 14	84°F29°C	67°F19°C	0.04 in1.1 mm· 9%	35%	Clear	SSW 4 mph6 km/h
DayPartly cloudy and warm, with a high of 84°F29°C and morning low of 70°F21°C. Breezy from the SW at 5 to 7 mph8 to 11 km/h. NightPartly cloudy, with a low around 67°F19°C. Light wind from the SSW around 2 mph4 km/h.
	TuesdaySep 15	85°F29°C	66°F19°C	0.02 in0.4 mm· 7%	26%	Clear	SW 3 mph5 km/h
DayPartly cloudy and warm, with a high of 85°F29°C and morning low of 71°F22°C. Breezy from the SW at 5 to 7 mph7 to 11 km/h. NightMostly clear, with a low around 66°F19°C. Light wind from the SW around 2 mph3 km/h.
	WednesdaySep 16	85°F30°C	67°F19°C	0 in0 mm· —	24%	Clear	SW 3 mph5 km/h
DayPartly cloudy and warm, with a high of 85°F30°C and morning low of 71°F22°C. Breezy from the SW at 5 to 7 mph8 to 11 km/h. NightMostly clear, with a low around 67°F19°C. Light wind from the SW around 2 mph3 km/h.

Nearby Cities

South San Jose Hills2 mi4 km Diamond Bar3 mi5 km Rowland Heights4 mi6 km Valinda5 mi8 km La Puente5 mi8 km Covina5 mi8 km

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.

WeatherMesh consistently outperforms legacy models in independent benchmarks. View Benchmarks →

Access WeatherMesh forecasts programmatically via our API. API Documentation →

How to Access Weather Forecasts

Pattern	Example	Description
/weather/{country}/{city}/	/weather/united-states/san-francisco/	City forecast (canonical URL)
/weather/{city}/	/weather/tokyo/	Shorthand — redirects to most populous match
/weather/{country}/{region}/{city}/	/weather/united-states/california/san-francisco/	With region — redirects to canonical
/weather/nearby?lat={lat}&lon={lon}	/weather/nearby?lat=48.1&lon=11.5	Find nearest city by coordinates
/weather/{country}/	/weather/germany/	Country index — all cities by region

Country and city names use lowercase slugs with hyphens (e.g. united-states, san-francisco). Arbitrary city names are supported — if not in our database, we geocode the name and serve the forecast for that location.

For programmatic access, use theWindBorne Forecast APIwhich returns structured JSON for any coordinates worldwide.

Coordinates: 34.0203°N, 117.8653°W·Elevation: 171m·Timezone: America/Los_Angeles·Population: 30,237