RANCHO CUCAMONGA, CA 91739 Weather Forecast & Current Conditions

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ONTARIO, CA
Current Weather

12:53 AM PDT MAY 13, 2025
Broken Clouds
57°F
Feels Like: 55°F
Dewpoint: 52°F
Rel. Hum.: 83%
Visibility: 10 miles
Wind: SW at 8 mph
Pressure: 29.95 inches
Last 72 hours

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RANCHO CUCAMONGA, CA 91739
Weather Forecast

Snowfall Forecast pages
Snow Depth pages
TONIGHT
Partly cloudy this evening, then mostly cloudy with patchy drizzle and a slight chance of showers overnight. Colder. Lows 43 to 51. Areas of winds southwest 10 to 20 mph. Gusts to 30 mph...becoming 25 mph overnight. Chance of measurable precipitation 20 percent.
TUESDAY
Partly cloudy. Patchy drizzle in the morning. Patchy fog in the morning. Highs 64 to 71. Areas of winds southwest 10 to 15 mph. Gusts to 25 mph...becoming 30 mph in the afternoon.
TUESDAY NIGHT
Partly cloudy in the evening...becoming mostly clear. Lows 42 to 51. Areas of winds southwest 10 to 15 mph with gusts to 25 mph becoming south overnight.
WEDNESDAY
Mostly sunny. Warmer. Highs 74 to 78. Light winds becoming west 10 to 15 mph with gusts to 25 mph in the afternoon.
WEDNESDAY NIGHT
Mostly clear. Lows 46 to 53. Areas of winds west 10 to 15 mph with gusts to 25 mph in the evening becoming light.
THURSDAY
Mostly sunny. Highs 75 to 80.
THURSDAY NIGHT
Mostly clear in the evening...becoming partly cloudy. Lows 46 to 54.
FRIDAY
Partly cloudy. Highs 73 to 78.
FRIDAY NIGHT
Partly cloudy in the evening...becoming mostly cloudy overnight with patchy fog. Lows 48 to 55.
SATURDAY
Cloudy in the morning...becoming partly cloudy. Patchy fog in the morning. Highs 67 to 72.
SATURDAY NIGHT
Partly cloudy in the evening...becoming mostly cloudy overnight with patchy fog. Lows 46 to 54.
SUNDAY
Mostly cloudy with patchy fog in the morning...becoming partly cloudy. Highs 65 to 70.
SUNDAY NIGHT
Partly cloudy. Patchy fog overnight. Lows 45 to 52.

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  5/12/2025
Tuesday
13 MAY 2025
RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 0 hours 11 PM 58° 55° Mostly Cloudy 3%

0% Thunder
( 2% severe)
SW   14 75% 50°
Low 53° RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 3 hours 2 AM 56° 53° Mostly Cloudy SW   12 77% 49°
High 69° RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 6 hours 5 AM 54° 52° Mostly Cloudy 1%

0% Thunder
( 1% severe)
SW   7 80% 48°

Mostly Cloudy



RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 9 hours 8 AM 56° 55° Mostly Cloudy SSW   5 72% 47°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 12 hours 11 AM 62° 61° Partly Cloudy 0%

0% Thunder
( 0% severe)
SW   8 54% 45°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 15 hours 2 PM 67° 67° Partly Cloudy SW   14 45% 45°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 18 hours 5 PM 67° 67° Partly Cloudy 0%

0% Thunder
( 0% severe)
SW   15 45% 45°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 1, 21 hours 8 PM 61° 59° Partly Cloudy SW   13 56% 45°
Wednesday
14 MAY 2025
RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 0 hours 11 PM 57° 56° Partly Cloudy 0%

0% Thunder
( 0% severe)
SW   7 72% 48°
Low 52° RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 3 hours 2 AM 55° 55° Partly Cloudy NNW   3 77% 48°
High 75° RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 6 hours 5 AM 52° 52° Partly Cloudy 0%

0% Thunder
( 0% severe)
NE   3 83% 47°

Partly Cloudy



RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 9 hours 8 AM 56° 56° Partly Cloudy SSE   3 74% 48°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 12 hours 11 AM 66° 66° Clear 0%

0% Thunder
( 0% severe)
WSW   6 48% 46°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 15 hours 2 PM 73° 73° Clear WSW   13 37% 45°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 18 hours 5 PM 74° 74° Clear 0%

0% Thunder
( 0% severe)
WSW   14 38% 47°
RANCHO CUCAMONGA, CA 91739 weather forecast Day 2, 21 hours 8 PM 67° 67° Clear WSW   10 49% 47°

ONTARIO, CA extended weather forecast

Thursday
15 MAY 2025
Friday
16 MAY 2025
Saturday
17 MAY 2025
Sunday
18 MAY 2025
Monday
19 MAY 2025
Low 55° Low 56° Low 57° Low 56° Low 55°
High 75° High 74° High 69° High 72° High 78°
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
1% Rain
Mostly Cloudy
1% Rain
Overcast
29% Rain
Overcast
27% Rain
Partly Cloudy
10% Rain
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