RANCHO CUCAMONGA, CA 91739 Weather Forecast & Current Conditions

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ONTARIO, CA
Current Weather

6:53 AM PDT APR 21, 2026
Clear
55°F
Feels Like: 55°F
Dewpoint: 46°F
Rel. Hum.: 72%
Visibility: 10 miles
Wind: Calm
Pressure: 30.02 inches
Last 72 hours

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RANCHO CUCAMONGA, CA 91739
Weather Forecast

Snowfall Forecast pages
Snow Depth pages
TODAY
Mostly sunny this morning, then partly cloudy with a slight chance of showers this afternoon. Highs 71 to 76. Areas of winds south to 10 mph...becoming southwest 10 to 20 mph with gusts to 35 mph this afternoon. Chance of measurable precipitation 20 percent.
TONIGHT
Cloudy with a chance of showers in the evening, then partly cloudy overnight. Lows 45 to 50. Areas of winds west 10 to 20 mph. Gusts to 30 mph in the evening. Chance of measurable precipitation 50 percent.
WEDNESDAY
Partly cloudy. Highs 67 to 72. Areas of winds west 10 to 15 mph. Gusts to 25 mph in the afternoon.
WEDNESDAY NIGHT
Mostly clear. Lows 41 to 44 in wind sheltered areas to 43 to 49 in warmer locations. Areas of winds west 10 to 15 mph with gusts to 25 mph in the evening becoming light.
THURSDAY
Mostly sunny in the morning...becoming partly cloudy. Highs 73 to 78. Light winds becoming west 10 to 15 mph with gusts to 25 mph in the afternoon.
THURSDAY NIGHT
Mostly clear in the evening...becoming partly cloudy. Lows 46 to 52.
FRIDAY
Partly cloudy. Highs 72 to 78.
FRIDAY NIGHT
Mostly clear in the evening...becoming partly cloudy. Lows 47 to 53.
SATURDAY
Partly cloudy with a slight chance of showers. Highs 65 to 71.
SATURDAY NIGHT
Partly cloudy. A slight chance of showers overnight. Lows 45 to 51.
SUNDAY
Partly cloudy. Highs 64 to 71.
SUNDAY NIGHT
Partly cloudy. Lows 44 to 50.
MONDAY
Partly cloudy. Highs 71 to 76.

Visible Weather Satellite
RANCHO CUCAMONGA, CA 91739
Infrared Weather Satellite
RANCHO CUCAMONGA, CA 91739
NEXRAD Weather Radar
RANCHO CUCAMONGA, CA 91739

ONTARIO, CA 3 hourly weather forecast

weather forecast created  5:00 PM PDT  4/20/2026
Tuesday
21 APR 2026
RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 0 hours 11 PM 60° 60° Partly Cloudy 0%

0% Thunder
( 0% severe)
WSW   6 62% 47°
Low 53° RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 3 hours 2 AM 56° 56° Clear W   2 77% 49°
High 73° RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 6 hours 5 AM 54° 54° Partly Cloudy 0%

0% Thunder
( 0% severe)
  CALM 83% 49°

Partly Cloudy

Chance of Rain

RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 9 hours 8 AM 56° 56° Partly Cloudy   CALM 77% 49°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 12 hours 11 AM 65° 65° Clear 20%
RAIN
<.01 in
0% Thunder
( 5% severe)
SW   6 50% 46°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 15 hours 2 PM 71° 71° Clear SW   14 41% 46°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 18 hours 5 PM 66° 66° Mostly Cloudy 33%
RAIN
1–2 in
0% Thunder
( 5% severe)
WSW   15 58% 51°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 21 hours 8 PM 61° 59° Mostly Cloudy WSW   13 72% 52°
Wednesday
22 APR 2026
RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 0 hours 11 PM 58° 56° Partly Cloudy 1%

0% Thunder
( 1% severe)
WSW   9 77% 51°
Low 52° RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 3 hours 2 AM 55° 54° Partly Cloudy SW   6 86% 51°
High 71° RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 6 hours 5 AM 53° 53° Partly Cloudy 0%

0% Thunder
( 1% severe)
SSW   2 90% 50°

Partly Cloudy



RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 9 hours 8 AM 55° 55° Mostly Cloudy SSW   2 83% 50°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 12 hours 11 AM 62° 62° Partly Cloudy 0%

0% Thunder
( 0% severe)
SW   5 54% 45°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 15 hours 2 PM 69° 69° Partly Cloudy SW   12 35% 40°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 18 hours 5 PM 69° 69° Partly Cloudy 0%

0% Thunder
( 0% severe)
WSW   14 37% 42°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 21 hours 8 PM 63° 62° Clear WSW   10 48% 43°

ONTARIO, CA extended weather forecast

Thursday
23 APR 2026
Friday
24 APR 2026
Saturday
25 APR 2026
Sunday
26 APR 2026
Monday
27 APR 2026
Low 53° Low 55° Low 54° Low 52° Low 53°
High 76° High 72° High 66° High 70° High 72°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 3 RANCHO CUCAMONGA, CA 91739 weather forecast Day 4 RANCHO CUCAMONGA, CA 91739 weather forecast Day 5 RANCHO CUCAMONGA, CA 91739 weather forecast Day 6 RANCHO CUCAMONGA, CA 91739 weather forecast Day 7
Partly Cloudy
5% Rain
Mostly Cloudy
6% Rain
Overcast
36% Rain
Partly Cloudy
37% Rain
Partly Cloudy
13% Rain
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