RANCHO CUCAMONGA, CA 91737 Weather Forecast & Current Conditions

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ONTARIO, CA
Current Weather

1:53 PM PDT AUG 20, 2025
Scattered Clouds
97°F
Feels Like: 94°F
Dewpoint: 48°F
Rel. Hum.: 19%
Visibility: 10 miles
Wind: SW at 7 mph, gusts to 16
Pressure: 29.92 inches
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RANCHO CUCAMONGA, CA 91737
Weather Forecast

Snowfall Forecast pages
Snow Depth pages
TONIGHT
Mostly clear. Lows 67 to 72. Areas of winds west to 10 mph this evening becoming light.
THURSDAY
Mostly sunny. Highs 100 to 107. Light winds becoming west 10 mph in the afternoon.
THURSDAY NIGHT
Mostly clear. Lows 69 to 74. Areas of winds west to 10 mph in the evening becoming light.
FRIDAY
Mostly sunny in the morning, then partly cloudy with a slight chance of showers and thunderstorms in the afternoon. Highs 99 to 106. Light winds becoming southwest 10 to 15 mph in the afternoon. Chance of measurable precipitation 20 percent.
FRIDAY NIGHT
Partly cloudy with a slight chance of showers and thunderstorms. Lows 69 to 74. Areas of winds southwest to 10 mph in the evening becoming light. Chance of measurable precipitation 20 percent.
SATURDAY
Partly cloudy with a slight chance of thunderstorms. A slight chance of showers in the morning, then a chance of showers in the afternoon. Highs 96 to 103.
SATURDAY NIGHT
Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly clear overnight. Lows 68 to 73.
SUNDAY
Partly cloudy. A chance of showers and a slight chance of thunderstorms in the afternoon. Highs 96 to 103.
SUNDAY NIGHT
Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly clear overnight. Lows 67 to 72.
MONDAY
Partly cloudy. A slight chance of showers and thunderstorms in the afternoon. Highs 92 to 99.
MONDAY NIGHT
Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly clear overnight. Lows 63 to 68.
TUESDAY
Partly cloudy with a slight chance of showers and thunderstorms. Highs 89 to 96.
TUESDAY NIGHT
Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly clear overnight. Lows 60 to 65.

Visible Weather Satellite
RANCHO CUCAMONGA, CA 91737
Infrared Weather Satellite
RANCHO CUCAMONGA, CA 91737
NEXRAD Weather Radar
RANCHO CUCAMONGA, CA 91737

ONTARIO, CA 3 hourly weather forecast

weather forecast created  5:00 AM PDT  8/20/2025
Wednesday
20 AUG 2025
RANCHO CUCAMONGA, CA 91737 weather forecast Day 1, 12 hours 11 AM 85° 84° Clear 0%

0% Thunder
( 0% severe)
SW   3 35% 54°
High 97° RANCHO CUCAMONGA, CA 91737 weather forecast Day 1, 15 hours 2 PM 96° 93° Clear WSW   7 20% 49°
Clear



RANCHO CUCAMONGA, CA 91737 weather forecast Day 1, 18 hours 5 PM 95° 92° Clear 0%

0% Thunder
( 0% severe)
WSW   12 24% 52°
RANCHO CUCAMONGA, CA 91737 weather forecast Day 1, 21 hours 8 PM 85° 83° Partly Cloudy WSW   7 33% 53°
Thursday
21 AUG 2025
RANCHO CUCAMONGA, CA 91737 weather forecast Day 2, 0 hours 11 PM 78° 79° Partly Cloudy 1%

0% Thunder
( 0% severe)
W   5 43% 54°
Low 71° RANCHO CUCAMONGA, CA 91737 weather forecast Day 2, 3 hours 2 AM 75° 75° Partly Cloudy NNE   3 50% 55°
High 102° RANCHO CUCAMONGA, CA 91737 weather forecast Day 2, 6 hours 5 AM 73° 73° Clear 1%

0% Thunder
( 0% severe)
NE   3 53% 55°

Partly Cloudy



RANCHO CUCAMONGA, CA 91737 weather forecast Day 2, 9 hours 8 AM 77° 79° Partly Cloudy ENE   2 48% 56°
RANCHO CUCAMONGA, CA 91737 weather forecast Day 2, 12 hours 11 AM 90° 88° Partly Cloudy 3%

0% Thunder
( 1% severe)
SW   3 30% 54°
RANCHO CUCAMONGA, CA 91737 weather forecast Day 2, 15 hours 2 PM 100° 98° Partly Cloudy WSW   9 21% 53°
RANCHO CUCAMONGA, CA 91737 weather forecast Day 2, 18 hours 5 PM 99° 97° Clear 3%

0% Thunder
( 1% severe)
WSW   12 22% 54°
RANCHO CUCAMONGA, CA 91737 weather forecast Day 2, 21 hours 8 PM 88° 86° Partly Cloudy WSW   8 31% 54°
Friday
22 AUG 2025
RANCHO CUCAMONGA, CA 91737 weather forecast Day 3, 0 hours 11 PM 80° 80° Clear 1%

0% Thunder
( 0% severe)
WSW   5 44% 56°
Low 73° RANCHO CUCAMONGA, CA 91737 weather forecast Day 3, 3 hours 2 AM 77° 79° Clear WNW   2 50% 57°
High 102° RANCHO CUCAMONGA, CA 91737 weather forecast Day 3, 6 hours 5 AM 76° 78° Partly Cloudy 2%

0% Thunder
( 1% severe)
NNW   2 54% 58°

Partly Cloudy



RANCHO CUCAMONGA, CA 91737 weather forecast Day 3, 9 hours 8 AM 78° 79° Partly Cloudy E   1 52% 59°
RANCHO CUCAMONGA, CA 91737 weather forecast Day 3, 15 hours 11 AM 90° 89° Clear 8%

0% Thunder
( 7% severe)
SW   5 34% 58°
RANCHO CUCAMONGA, CA 91737 weather forecast Day 3, 18 hours 2 PM 100° 99° Clear WSW   9 23% 56°
RANCHO CUCAMONGA, CA 91737 weather forecast Day 3, 21 hours 5 PM 97° 96° Clear     WSW   13 26% 56°

ONTARIO, CA extended weather forecast

Saturday
23 AUG 2025
Sunday
24 AUG 2025
Monday
25 AUG 2025
Tuesday
26 AUG 2025
Wednesday
27 AUG 2025
Low 74° Low 73° Low 71° Low 69° Low 65°
High 102° High 103° High 98° High 91° High 89°
RANCHO CUCAMONGA, CA 91737 weather forecast Day 4 RANCHO CUCAMONGA, CA 91737 weather forecast Day 5 RANCHO CUCAMONGA, CA 91737 weather forecast Day 6 RANCHO CUCAMONGA, CA 91737 weather forecast Day 7 <!--SEARCHED_TOWN_NAME--> weather forecast Day 8
Mostly Cloudy
17% Rain
Clear
2% Rain
Partly Cloudy
4% Rain
Partly Cloudy
9% Rain
Clear
4% Rain
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