Current Conditions

Ontario, California

69°F21°C

Cloudy

Wind

SSW 3 mph4 km/h

Humidity

74%

Cloud Cover

91%

As of Thursday, August 13, 2026 at 6:30 AM PDT

Today's Outlook

Day

Overcast and warm, with a high of 81°F27°C and morning low of 69°F21°C. Breezy from the SSW at 5 to 7 mph9 to 11 km/h.

Night

Overcast, with a low around 67°F19°C. Light wind from the SW around 3 mph5 km/h.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Cloudy	High 81°F27°C	Low 67°F19°C	Precip 0 in0 mm—	Cloud 92%	Wind SSW 4 mph7 km/h	Thursday: Overcast and warm, with a high of 81°F27°C and morning low of 69°F21°C. Breezy from the SSW at 5 to 7 mph9 to 11 km/h. Thursday Night: Overcast, with a low around 67°F19°C. Light wind from the SW around 3 mph5 km/h.
Clear	High 84°F29°C	Low 66°F19°C	Precip 0 in0.1 mm2%	Cloud 19%	Wind SW 4 mph6 km/h	Friday: Mostly clear and warm, with a high of 84°F29°C and morning low of 69°F21°C. Breezy from the SSW at 5 to 7 mph8 to 12 km/h. Friday Night: Mostly clear, with a low around 66°F19°C. Light wind from the SW around 3 mph4 km/h.
Clear	High 86°F30°C	Low 66°F19°C	Precip 0 in0 mm—	Cloud 9%	Wind SW 3 mph5 km/h	Saturday: Mostly clear and warm, with a high of 86°F30°C and morning low of 70°F21°C. Light wind from the SW around 4 mph7 km/h. Saturday Night: Mostly clear, with a low around 66°F19°C. Light wind from the SW around 2 mph3 km/h.
Clear	High 90°F32°C	Low 66°F19°C	Precip 0 in0 mm—	Cloud 24%	Wind SW 3 mph5 km/h	Sunday: Mostly clear and hot, with a high of 90°F32°C and morning low of 71°F22°C. Breezy from the SW at 4 to 7 mph7 to 11 km/h. Sunday Night: Partly cloudy, with a low around 66°F19°C. Light wind from the WSW around 2 mph3 km/h.
Partly Cloudy	High 91°F33°C	Low 68°F20°C	Precip 0 in0 mm—	Cloud 48%	Wind SW 3 mph5 km/h	Monday: Partly cloudy and hot, with a high of 91°F33°C and morning low of 73°F23°C. Breezy from the SW at 5 to 7 mph7 to 11 km/h. Monday Night: Mostly cloudy, with a low around 68°F20°C. Light wind from the SW around 2 mph3 km/h.
Clear	High 92°F33°C	Low 69°F20°C	Precip 0 in0 mm—	Cloud 33%	Wind SW 3 mph5 km/h	Tuesday: Partly cloudy and hot, with a high of 92°F33°C and morning low of 74°F24°C. Breezy from the SW at 5 to 7 mph7 to 11 km/h. Tuesday Night: Partly cloudy, with a low around 69°F20°C. Light wind from the SW around 2 mph3 km/h.
Clear	High 92°F33°C	Low 69°F21°C	Precip 0 in0 mm—	Cloud 21%	Wind SW 3 mph5 km/h	Wednesday: Mostly clear and hot, with a high of 92°F33°C and morning low of 75°F24°C. Breezy from the SW at 5 to 7 mph8 to 11 km/h. Wednesday Night: Mostly clear, with a low around 69°F21°C. Light wind from the SSW around 2 mph3 km/h.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	ThursdayAug 13	81°F27°C	67°F19°C	0 in0 mm· —	92%	Cloudy	SSW 4 mph7 km/h
DayOvercast and warm, with a high of 81°F27°C and morning low of 69°F21°C. Breezy from the SSW at 5 to 7 mph9 to 11 km/h. NightOvercast, with a low around 67°F19°C. Light wind from the SW around 3 mph5 km/h.
	FridayAug 14	84°F29°C	66°F19°C	0 in0.1 mm· 2%	19%	Clear	SW 4 mph6 km/h
DayMostly clear and warm, with a high of 84°F29°C and morning low of 69°F21°C. Breezy from the SSW at 5 to 7 mph8 to 12 km/h. NightMostly clear, with a low around 66°F19°C. Light wind from the SW around 3 mph4 km/h.
	SaturdayAug 15	86°F30°C	66°F19°C	0 in0 mm· —	9%	Clear	SW 3 mph5 km/h
DayMostly clear and warm, with a high of 86°F30°C and morning low of 70°F21°C. Light wind from the SW around 4 mph7 km/h. NightMostly clear, with a low around 66°F19°C. Light wind from the SW around 2 mph3 km/h.
	SundayAug 16	90°F32°C	66°F19°C	0 in0 mm· —	24%	Clear	SW 3 mph5 km/h
DayMostly clear and hot, with a high of 90°F32°C and morning low of 71°F22°C. Breezy from the SW at 4 to 7 mph7 to 11 km/h. NightPartly cloudy, with a low around 66°F19°C. Light wind from the WSW around 2 mph3 km/h.
	MondayAug 17	91°F33°C	68°F20°C	0 in0 mm· —	48%	Partly Cloudy	SW 3 mph5 km/h
DayPartly cloudy and hot, with a high of 91°F33°C and morning low of 73°F23°C. Breezy from the SW at 5 to 7 mph7 to 11 km/h. NightMostly cloudy, with a low around 68°F20°C. Light wind from the SW around 2 mph3 km/h.
	TuesdayAug 18	92°F33°C	69°F20°C	0 in0 mm· —	33%	Clear	SW 3 mph5 km/h
DayPartly cloudy and hot, with a high of 92°F33°C and morning low of 74°F24°C. Breezy from the SW at 5 to 7 mph7 to 11 km/h. NightPartly cloudy, with a low around 69°F20°C. Light wind from the SW around 2 mph3 km/h.
	WednesdayAug 19	92°F33°C	69°F21°C	0 in0 mm· —	21%	Clear	SW 3 mph5 km/h
DayMostly clear and hot, with a high of 92°F33°C and morning low of 75°F24°C. Breezy from the SW at 5 to 7 mph8 to 11 km/h. NightMostly clear, with a low around 69°F21°C. Light wind from the SSW around 2 mph3 km/h.
	ThursdayAug 20	92°F33°C	69°F21°C	0 in0 mm· —	28%	Clear	SW 3 mph5 km/h
DayPartly cloudy and hot, with a high of 92°F33°C and morning low of 75°F24°C. Breezy from the SW at 5 to 7 mph7 to 11 km/h. NightPartly cloudy, with a low around 69°F21°C. Light wind from the SW around 2 mph3 km/h.
	FridayAug 21	92°F33°C	69°F21°C	0 in0 mm· —	26%	Clear	SW 3 mph5 km/h
DayPartly cloudy and hot, with a high of 92°F33°C and morning low of 75°F24°C. Light wind from the SW around 5 mph7 km/h. NightPartly cloudy, with a low around 69°F21°C. Light wind from the SW around 2 mph3 km/h.
	SaturdayAug 22	92°F33°C	69°F20°C	0 in0.1 mm· 5%	19%	Clear	SW 3 mph5 km/h
DayMostly clear and hot, with a high of 92°F33°C and morning low of 75°F24°C. Light wind from the SW around 5 mph7 km/h. NightMostly clear, with a low around 69°F20°C. Light wind from the SW around 2 mph3 km/h.
	SundayAug 23	92°F33°C	69°F20°C	0 in0.1 mm· 2%	16%	Clear	SW 3 mph5 km/h
DayMostly clear and hot, with a high of 92°F33°C and morning low of 74°F23°C. Light wind from the SW around 4 mph7 km/h. NightMostly clear, with a low around 69°F20°C. Light wind from the SW around 2 mph3 km/h.
	MondayAug 24	92°F33°C	68°F20°C	0 in0.1 mm· 4%	15%	Clear	SW 3 mph5 km/h
DayMostly clear and hot, with a high of 92°F33°C and morning low of 74°F24°C. Light wind from the SW around 4 mph7 km/h. NightMostly clear, with a low around 68°F20°C. Light wind from the SW around 2 mph3 km/h.
	TuesdayAug 25	92°F33°C	69°F20°C	0.01 in0.2 mm· 6%	17%	Clear	SW 3 mph5 km/h
DayMostly clear and hot, with a high of 92°F33°C and morning low of 74°F23°C. Light wind from the SW around 4 mph7 km/h. NightMostly clear, with a low around 69°F20°C. Light wind from the SW around 2 mph3 km/h.
	WednesdayAug 26	92°F33°C	69°F20°C	0.02 in0.4 mm· 7%	25%	Clear	SW 3 mph5 km/h
DayPartly cloudy and hot, with a high of 92°F33°C and morning low of 75°F24°C. Light wind from the SW around 4 mph7 km/h. NightMostly clear, with a low around 69°F20°C. Light wind from the SW around 2 mph3 km/h.
	ThursdayAug 27	90°F32°C	69°F21°C	0.03 in0.8 mm· 9%	34%	Clear	SW 3 mph5 km/h
DayPartly cloudy and hot, with a high of 90°F32°C and morning low of 74°F23°C. Light wind from the SW around 4 mph7 km/h. NightPartly cloudy, with a low around 69°F21°C. Light wind from the SW around 2 mph3 km/h.

Nearby Cities

Upland2 mi4 km Montclair2 mi4 km Chino4 mi7 km Rancho Cucamonga4 mi7 km Claremont5 mi7 km Pomona6 mi9 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: 34.0633°N, 117.6509°W·Elevation: 306m·Timezone: America/Los_Angeles·Population: 171,214