Current Conditions

Walnut, California

92°F33°C

Drizzle

Wind

WNW 6 mph10 km/h

Humidity

38%

Cloud Cover

35%

As of Tuesday, September 8, 2026 at 4:40 PM PDT

Today's Outlook

Day

Mostly cloudy and hot, with a high of 92°F33°C. Light wind from the W around 4 mph7 km/h. 13% chance of drizzle in the afternoon.

Night

Mostly clear, with a low around 80°F27°C. Light wind from the NNW around 3 mph5 km/h.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Drizzle	High 92°F33°C	Low 80°F27°C	Precip 0.01 in0.2 mm13%	Cloud 41%	Wind WNW 4 mph6 km/h	Tuesday: Mostly cloudy and hot, with a high of 92°F33°C. Light wind from the W around 4 mph7 km/h. 13% chance of drizzle in the afternoon. Tuesday Night: Mostly clear, with a low around 80°F27°C. Light wind from the NNW around 3 mph5 km/h.
Drizzle	High 100°F38°C	Low 75°F24°C	Precip 0.01 in0.3 mm22%	Cloud 23%	Wind WNW 3 mph6 km/h	Wednesday: Mostly clear and hot, with a high of 100°F38°C and morning low of 80°F27°C. Light wind from the W around 4 mph7 km/h. 22% chance of drizzle in the afternoon. Heat risk in the afternoon. Wednesday Night: Partly cloudy, with a low around 75°F24°C. Light wind from the NNE around 3 mph5 km/h.
Clear	High 94°F34°C	Low 77°F25°C	Precip 0 in0.1 mm4%	Cloud 18%	Wind SSW 4 mph6 km/h	Thursday: Mostly clear and hot, with a high of 94°F34°C and morning low of 81°F27°C. Breezy from the SSW at 5 to 7 mph8 to 11 km/h. Humid. Thursday Night: Mostly clear, with a low around 77°F25°C. Light wind from the SE around 2 mph4 km/h.
Clear	High 89°F32°C	Low 74°F23°C	Precip 0 in0 mm—	Cloud 4%	Wind SSW 3 mph5 km/h	Friday: Mostly clear and hot, with a high of 89°F32°C and morning low of 77°F25°C. Breezy from the SSW at 5 to 7 mph8 to 11 km/h. Humid. Friday Night: Mostly clear, with a low around 74°F23°C. Light wind from the S around 2 mph3 km/h.
Clear	High 86°F30°C	Low 71°F22°C	Precip 0 in0 mm—	Cloud 8%	Wind SSW 3 mph5 km/h	Saturday: Mostly clear and hot, with a high of 86°F30°C and morning low of 74°F23°C. Light wind from the SSW around 5 mph7 km/h. Saturday Night: Mostly clear, with a low around 71°F22°C. Light wind from the SSW around 2 mph3 km/h.
Clear	High 87°F31°C	Low 68°F20°C	Precip 0 in0 mm—	Cloud 12%	Wind SSW 3 mph5 km/h	Sunday: Mostly clear and hot, with a high of 87°F31°C and morning low of 72°F22°C. Light wind from the SW around 5 mph7 km/h. Sunday Night: Mostly clear, with a low around 68°F20°C. Light wind from the SSW around 2 mph3 km/h.
Clear	High 86°F30°C	Low 68°F20°C	Precip 0 in0 mm—	Cloud 10%	Wind SSW 3 mph5 km/h	Monday: Mostly clear and hot, with a high of 86°F30°C and morning low of 72°F22°C. Breezy from the SSW at 5 to 7 mph8 to 11 km/h. Monday Night: Mostly clear, with a low around 68°F20°C. Light wind from the S around 2 mph3 km/h.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	TuesdaySep 8	92°F33°C	80°F27°C	0.01 in0.2 mm· 13%	41%	Drizzle	WNW 4 mph6 km/h
DayMostly cloudy and hot, with a high of 92°F33°C. Light wind from the W around 4 mph7 km/h. 13% chance of drizzle in the afternoon. NightMostly clear, with a low around 80°F27°C. Light wind from the NNW around 3 mph5 km/h.
	WednesdaySep 9	100°F38°C	75°F24°C	0.01 in0.3 mm· 22%	23%	Drizzle	WNW 3 mph6 km/h
DayMostly clear and hot, with a high of 100°F38°C and morning low of 80°F27°C. Light wind from the W around 4 mph7 km/h. 22% chance of drizzle in the afternoon. Heat risk in the afternoon. NightPartly cloudy, with a low around 75°F24°C. Light wind from the NNE around 3 mph5 km/h.
	ThursdaySep 10	94°F34°C	77°F25°C	0 in0.1 mm· 4%	18%	Clear	SSW 4 mph6 km/h
DayMostly clear and hot, with a high of 94°F34°C and morning low of 81°F27°C. Breezy from the SSW at 5 to 7 mph8 to 11 km/h. Humid. NightMostly clear, with a low around 77°F25°C. Light wind from the SE around 2 mph4 km/h.
	FridaySep 11	89°F32°C	74°F23°C	0 in0 mm· —	4%	Clear	SSW 3 mph5 km/h
DayMostly clear and hot, with a high of 89°F32°C and morning low of 77°F25°C. Breezy from the SSW at 5 to 7 mph8 to 11 km/h. Humid. NightMostly clear, with a low around 74°F23°C. Light wind from the S around 2 mph3 km/h.
	SaturdaySep 12	86°F30°C	71°F22°C	0 in0 mm· —	8%	Clear	SSW 3 mph5 km/h
DayMostly clear and hot, with a high of 86°F30°C and morning low of 74°F23°C. Light wind from the SSW around 5 mph7 km/h. NightMostly clear, with a low around 71°F22°C. Light wind from the SSW around 2 mph3 km/h.
	SundaySep 13	87°F31°C	68°F20°C	0 in0 mm· —	12%	Clear	SSW 3 mph5 km/h
DayMostly clear and hot, with a high of 87°F31°C and morning low of 72°F22°C. Light wind from the SW around 5 mph7 km/h. NightMostly clear, with a low around 68°F20°C. Light wind from the SSW around 2 mph3 km/h.
	MondaySep 14	86°F30°C	68°F20°C	0 in0 mm· —	10%	Clear	SSW 3 mph5 km/h
DayMostly clear and hot, with a high of 86°F30°C and morning low of 72°F22°C. Breezy from the SSW at 5 to 7 mph8 to 11 km/h. NightMostly clear, with a low around 68°F20°C. Light wind from the S around 2 mph3 km/h.
	TuesdaySep 15	84°F29°C	67°F19°C	0 in0 mm· —	16%	Clear	SSW 3 mph5 km/h
DayMostly clear and warm, with a high of 84°F29°C and morning low of 71°F22°C. Light wind from the SSW around 5 mph7 km/h. NightMostly clear, with a low around 67°F19°C. Light wind from the SSW around 2 mph3 km/h.
	WednesdaySep 16	84°F29°C	66°F19°C	0.01 in0.3 mm· 2%	20%	Clear	SSW 3 mph5 km/h
DayMostly clear and warm, with a high of 84°F29°C and morning low of 69°F21°C. Light wind from the SSW around 5 mph7 km/h. NightMostly clear, with a low around 66°F19°C. Light wind from the SW around 2 mph3 km/h.
	ThursdaySep 17	84°F29°C	65°F18°C	0.01 in0.3 mm· 3%	22%	Clear	SW 3 mph5 km/h
DayMostly clear and warm, with a high of 84°F29°C and morning low of 70°F21°C. Light wind from the SW around 5 mph7 km/h. NightMostly clear, with a low around 65°F18°C. Light wind from the SW around 2 mph3 km/h.
	FridaySep 18	87°F30°C	65°F19°C	0.01 in0.3 mm· 2%	24%	Clear	SW 3 mph5 km/h
DayPartly cloudy and hot, with a high of 87°F30°C and morning low of 69°F21°C. Light wind from the SW around 4 mph7 km/h. NightMostly clear, with a low around 65°F19°C. Light wind from the SW around 2 mph3 km/h.
	SaturdaySep 19	88°F31°C	67°F19°C	0 in0.1 mm· 2%	26%	Clear	SW 3 mph5 km/h
DayPartly cloudy and hot, with a high of 88°F31°C and morning low of 71°F22°C. Light wind from the SW around 4 mph7 km/h. NightPartly cloudy, with a low around 67°F19°C. Light wind from the SSW around 2 mph3 km/h.
	SundaySep 20	87°F31°C	67°F19°C	0 in0.1 mm· 2%	31%	Clear	SW 3 mph5 km/h
DayPartly cloudy and hot, with a high of 87°F31°C and morning low of 70°F21°C. Light wind from the SW around 5 mph7 km/h. NightPartly cloudy, with a low around 67°F19°C. Light wind from the SSW around 2 mph3 km/h.
	MondaySep 21	85°F30°C	66°F19°C	0.04 in1.1 mm· 3%	31%	Clear	SW 3 mph5 km/h
DayPartly cloudy and warm, with a high of 85°F30°C and morning low of 69°F21°C. Light wind from the SW around 5 mph8 km/h. NightPartly cloudy, with a low around 66°F19°C. Light wind from the SSW around 2 mph3 km/h.
	TuesdaySep 22	86°F30°C	66°F19°C	0.04 in0.9 mm· 6%	31%	Clear	SW 3 mph6 km/h
DayPartly cloudy and warm, with a high of 86°F30°C and morning low of 69°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 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