RANCHO CUCAMONGA, CA 91739 Weather Forecast & Current Conditions

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ONTARIO, CA
Current Weather

6:53 PM PDT MAY 17, 2025
Broken Clouds
57°F
Feels Like: 54°F
Dewpoint: 54°F
Rel. Hum.: 90%
Visibility: 8 miles
Wind: SW at 12 mph, gusts to 21
Pressure: 29.91 inches
Last 72 hours

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RANCHO CUCAMONGA, CA 91739
Weather Forecast

Snowfall Forecast pages
Snow Depth pages
TONIGHT
Cloudy with a slight chance of showers. Patchy fog. Lows 44 to 53. Areas of winds southwest 10 to 15 mph with gusts to 30 mph becoming south overnight. Chance of measurable precipitation 20 percent.
SUNDAY
Cloudy with patchy fog in the morning...becoming mostly sunny. Warmer. Highs 71 to 76. Areas of winds south to 10 mph becoming southwest with gusts to 25 mph in the afternoon.
SUNDAY NIGHT
Partly cloudy. Lows 47 to 53. Areas of winds southwest 10 to 15 mph with gusts to 25 mph in the evening becoming light.
MONDAY
Partly cloudy in the morning...becoming mostly sunny. Warmer. Highs 83 to 87. Areas of winds west to 10 mph with gusts to 25 mph...becoming 10 to 15 mph with gusts to 30 mph in the afternoon.
MONDAY NIGHT
Mostly clear. Lows 54 to 57 in wind sheltered areas to 55 to 61 in warmer locations. Areas of winds west 10 to 15 mph with gusts to 30 mph becoming east overnight.
TUESDAY
Mostly sunny. Highs 89 to 93.
TUESDAY NIGHT
Mostly clear. Lows 57 to 64.
WEDNESDAY
Mostly sunny. Highs 94 to 101.
WEDNESDAY NIGHT
Mostly clear. Lows 59 to 66.
THURSDAY
Mostly sunny. Highs 94 to 99.
THURSDAY NIGHT
Mostly clear in the evening...becoming partly cloudy. Lows 58 to 65.
FRIDAY
Patchy fog in the morning. Partly cloudy. Highs 87 to 92.
FRIDAY NIGHT
Partly cloudy. Lows 54 to 60.

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 AM PDT  5/17/2025
Saturday
17 MAY 2025
RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 12 hours 11 AM 61° 60° Mostly Cloudy 2%

0% Thunder
( 2% severe)
SW   7 70% 51°
High 66° RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 15 hours 2 PM 65° 65° Mostly Cloudy WSW   12 63% 52°
Mostly Cloudy



RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 18 hours 5 PM 64° 63° Mostly Cloudy 5%

0% Thunder
( 3% severe)
WSW   14 65% 52°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 21 hours 8 PM 60° 58° Mostly Cloudy WSW   13 72% 51°
Sunday
18 MAY 2025
RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 0 hours 11 PM 57° 55° Mostly Cloudy 5%

0% Thunder
( 1% severe)
WSW   9 83% 52°
Low 55° RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 3 hours 2 AM 57° 56° Mostly Cloudy WSW   6 80% 51°
High 74° RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 6 hours 5 AM 56° 56° Mostly Cloudy 2%

0% Thunder
( 0% severe)
WSW   3 83% 51°

Decreasing Clouds



RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 9 hours 8 AM 58° 59° Mostly Cloudy SSE   2 80% 52°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 12 hours 11 AM 65° 65° Clear 0%

0% Thunder
( 0% severe)
WSW   5 58% 50°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 15 hours 2 PM 72° 72° Clear WSW   13 46% 50°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 18 hours 5 PM 71° 71° Clear 0%

0% Thunder
( 0% severe)
WSW   15 49% 51°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 21 hours 8 PM 65° 65° Clear WSW   12 60% 51°
Monday
19 MAY 2025
RANCHO CUCAMONGA, CA 91739 weather forecast Day 3, 0 hours 11 PM 60° 60° Clear 0%

0% Thunder
( 0% severe)
WSW   6 72% 51°
Low 55° RANCHO CUCAMONGA, CA 91739 weather forecast Day 3, 3 hours 2 AM 57° 57° Clear WNW   3 77% 50°
High 84° RANCHO CUCAMONGA, CA 91739 weather forecast Day 3, 6 hours 5 AM 56° 56° Partly Cloudy 0%

0% Thunder
( 0% severe)
N   2 77% 49°

Partly Cloudy



RANCHO CUCAMONGA, CA 91739 weather forecast Day 3, 9 hours 8 AM 61° 62° Partly Cloudy N   3 65% 49°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 3, 15 hours 11 AM 73° 73° Clear 0%

0% Thunder
( 0% severe)
NW   7 40% 47°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 3, 18 hours 2 PM 82° 80° Clear W   10 27% 45°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 3, 21 hours 5 PM 82° 80° Clear     W   12 28% 46°

ONTARIO, CA extended weather forecast

Tuesday
20 MAY 2025
Wednesday
21 MAY 2025
Thursday
22 MAY 2025
Friday
23 MAY 2025
Saturday
24 MAY 2025
Low 58° Low 63° Low 64° Low 61° Low 60°
High 91° High 94° High 93° High 85° High 83°
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 <!--SEARCHED_TOWN_NAME--> weather forecast Day 8
Clear
1% Rain
Clear
1% Rain
Clear
2% Rain
Partly Cloudy
3% Rain
Partly Cloudy
2% Rain
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