Current Conditions

Rialto, California

70°F21°C

Clear

Wind

SW 4 mph7 km/h

Humidity

44%

Cloud Cover

As of Wednesday, September 2, 2026 at 8:23 PM PDT

Today's Outlook

Night

Mostly clear, with a low around 59°F15°C. Light wind from the S around 3 mph5 km/h.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Clear	High 81°F27°C	Low 59°F15°C	Precip 0 in0 mm—	Cloud 3%	Wind SSW 4 mph7 km/h	Thursday: Mostly clear and warm, with a high of 81°F27°C and morning low of 64°F18°C. Breezy from the SSW at 6 to 7 mph9 to 12 km/h. Dry air. Thursday Night: Mostly clear, with a low around 59°F15°C. Light wind from the S around 3 mph5 km/h.
Clear	High 82°F28°C	Low 60°F15°C	Precip 0 in0 mm—	Cloud 9%	Wind SSW 4 mph7 km/h	Friday: Mostly clear and warm, with a high of 82°F28°C and morning low of 64°F18°C. Breezy from the SSW at 5 to 7 mph9 to 12 km/h. Dry air. Friday Night: Mostly clear, with a low around 60°F15°C. Light wind from the S around 3 mph4 km/h.
Clear	High 84°F29°C	Low 60°F16°C	Precip 0.01 in0.3 mm7%	Cloud 9%	Wind S 4 mph6 km/h	Saturday: Mostly clear and warm, with a high of 84°F29°C and morning low of 68°F20°C. Breezy from the SSW at 6 to 8 mph9 to 13 km/h. Dry air. Saturday Night: Mostly clear, with a low around 60°F16°C. Light wind from the S around 2 mph4 km/h.
Showers	High 80°F27°C	Low 67°F19°C	Precip 0.11 in2.9 mm32%	Cloud 31%	Wind SSW 4 mph6 km/h	Sunday: Partly cloudy and warm, with a high of 80°F27°C and morning low of 69°F21°C. Light wind from the SSW around 5 mph8 km/h. 32% chance of showers throughout the day. Sunday Night: Partly cloudy, with a low around 67°F19°C. Light wind from the S around 2 mph4 km/h. 22% chance of drizzle overnight.
Clear	High 85°F29°C	Low 62°F17°C	Precip 0.02 in0.5 mm8%	Cloud 17%	Wind SSW 4 mph6 km/h	Monday: Mostly clear and warm, with a high of 85°F29°C and morning low of 69°F21°C. Light wind from the SSW around 5 mph8 km/h. Dry air. Monday Night: Mostly clear, with a low around 62°F17°C. Light wind from the S around 2 mph4 km/h.
Clear	High 87°F31°C	Low 63°F17°C	Precip 0.01 in0.2 mm3%	Cloud 27%	Wind SSW 3 mph5 km/h	Tuesday: Partly cloudy and hot, with a high of 87°F31°C and morning low of 68°F20°C. Light wind from the SW around 4 mph7 km/h. Dry air. Tuesday Night: Partly cloudy, with a low around 63°F17°C. Light wind from the SSE around 2 mph4 km/h.
Clear	High 87°F31°C	Low 66°F19°C	Precip 0.01 in0.3 mm7%	Cloud 23%	Wind SSW 3 mph5 km/h	Wednesday: Partly cloudy and hot, with a high of 87°F31°C and morning low of 71°F22°C. Light wind from the SW around 4 mph7 km/h. Dry air. Wednesday Night: Mostly clear, with a low around 66°F19°C. Light wind from the SSE around 2 mph4 km/h.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	ThursdaySep 3	81°F27°C	59°F15°C	0 in0 mm· —	3%	Clear	SSW 4 mph7 km/h
DayMostly clear and warm, with a high of 81°F27°C and morning low of 64°F18°C. Breezy from the SSW at 6 to 7 mph9 to 12 km/h. Dry air. NightMostly clear, with a low around 59°F15°C. Light wind from the S around 3 mph5 km/h.
	FridaySep 4	82°F28°C	60°F15°C	0 in0 mm· —	9%	Clear	SSW 4 mph7 km/h
DayMostly clear and warm, with a high of 82°F28°C and morning low of 64°F18°C. Breezy from the SSW at 5 to 7 mph9 to 12 km/h. Dry air. NightMostly clear, with a low around 60°F15°C. Light wind from the S around 3 mph4 km/h.
	SaturdaySep 5	84°F29°C	60°F16°C	0.01 in0.3 mm· 7%	9%	Clear	S 4 mph6 km/h
DayMostly clear and warm, with a high of 84°F29°C and morning low of 68°F20°C. Breezy from the SSW at 6 to 8 mph9 to 13 km/h. Dry air. NightMostly clear, with a low around 60°F16°C. Light wind from the S around 2 mph4 km/h.
	SundaySep 6	80°F27°C	67°F19°C	0.11 in2.9 mm· 32%	31%	Showers	SSW 4 mph6 km/h
DayPartly cloudy and warm, with a high of 80°F27°C and morning low of 69°F21°C. Light wind from the SSW around 5 mph8 km/h. 32% chance of showers throughout the day. NightPartly cloudy, with a low around 67°F19°C. Light wind from the S around 2 mph4 km/h. 22% chance of drizzle overnight.
	MondaySep 7	85°F29°C	62°F17°C	0.02 in0.5 mm· 8%	17%	Clear	SSW 4 mph6 km/h
DayMostly clear and warm, with a high of 85°F29°C and morning low of 69°F21°C. Light wind from the SSW around 5 mph8 km/h. Dry air. NightMostly clear, with a low around 62°F17°C. Light wind from the S around 2 mph4 km/h.
	TuesdaySep 8	87°F31°C	63°F17°C	0.01 in0.2 mm· 3%	27%	Clear	SSW 3 mph5 km/h
DayPartly cloudy and hot, with a high of 87°F31°C and morning low of 68°F20°C. Light wind from the SW around 4 mph7 km/h. Dry air. NightPartly cloudy, with a low around 63°F17°C. Light wind from the SSE around 2 mph4 km/h.
	WednesdaySep 9	87°F31°C	66°F19°C	0.01 in0.3 mm· 7%	23%	Clear	SSW 3 mph5 km/h
DayPartly cloudy and hot, with a high of 87°F31°C and morning low of 71°F22°C. Light wind from the SW around 4 mph7 km/h. Dry air. NightMostly clear, with a low around 66°F19°C. Light wind from the SSE around 2 mph4 km/h.
	ThursdaySep 10	88°F31°C	67°F19°C	0.02 in0.4 mm· 10%	19%	Drizzle	SSW 3 mph5 km/h
DayMostly clear 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. 10% chance of drizzle in the afternoon. NightMostly clear, with a low around 67°F19°C. Light wind from the S around 2 mph4 km/h.
	FridaySep 11	86°F30°C	66°F19°C	0.03 in0.8 mm· 6%	22%	Clear	SSW 4 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 66°F19°C. Light wind from the S around 2 mph4 km/h.
	SaturdaySep 12	84°F29°C	66°F19°C	0.03 in0.8 mm· 7%	31%	Clear	SSW 4 mph6 km/h
DayPartly cloudy and warm, with a high of 84°F29°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 S around 2 mph4 km/h.
	SundaySep 13	83°F28°C	65°F18°C	0.06 in1.6 mm· 11%	34%	Drizzle	SSW 4 mph6 km/h
DayPartly cloudy and warm, with a high of 83°F28°C and morning low of 68°F20°C. Light wind from the SW around 5 mph8 km/h. 11% chance of drizzle throughout the day. NightPartly cloudy, with a low around 65°F18°C. Light wind from the SSW around 2 mph4 km/h.
	MondaySep 14	84°F29°C	64°F18°C	0.04 in1.1 mm· 9%	28%	Clear	SSW 3 mph5 km/h
DayPartly cloudy and warm, with a high of 84°F29°C and morning low of 69°F20°C. Light wind from the SW around 4 mph7 km/h. NightPartly cloudy, with a low around 64°F18°C. Light wind from the S around 2 mph4 km/h.
	TuesdaySep 15	85°F30°C	65°F18°C	0.05 in1.3 mm· 12%	25%	Drizzle	SSW 3 mph5 km/h
DayPartly cloudy and warm, with a high of 85°F30°C and morning low of 69°F20°C. Light wind from the SSW around 4 mph7 km/h. 12% chance of drizzle throughout the day. NightMostly clear, with a low around 65°F18°C. Light wind from the S around 2 mph4 km/h.
	WednesdaySep 16	86°F30°C	65°F18°C	0.02 in0.4 mm· 9%	23%	Clear	SSW 3 mph5 km/h
DayPartly cloudy and warm, with a high of 86°F30°C and morning low of 71°F22°C. Light wind from the SW around 4 mph7 km/h. NightMostly clear, with a low around 65°F18°C. Light wind from the S around 2 mph3 km/h.
	ThursdaySep 17	86°F30°C	65°F18°C	0.04 in0.9 mm· 9%	26%	Clear	SW 3 mph5 km/h
DayPartly cloudy and hot, with a high of 86°F30°C and morning low of 70°F21°C. Light wind from the SW around 4 mph7 km/h. NightPartly cloudy, with a low around 65°F18°C. Light wind from the E around 2 mph3 km/h.

Nearby Cities

Bloomington3 mi5 km Fontana4 mi6 km Colton4 mi6 km San Bernardino5 mi7 km Loma Linda7 mi12 km Rubidoux8 mi13 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: 34.1064°N, 117.3703°W·Elevation: 383m·Timezone: America/Los_Angeles·Population: 103,132