RANCHO CUCAMONGA, CA 91739 Weather Forecast & Current Conditions

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91739 WEATHER WARNINGS (SEVERE T-STORM & TORNADO)

CURRENT WEATHER
ONTARIO, CA Current Weather
11:53 AM PDT AUG 21, 2025
Broken Clouds 97°F
Feels Like:	94°F
Dewpoint:	48°F
Rel. Hum.:	19%
Visibility:	10 miles
Wind:	SW at 8 mph
Pressure:	29.87 inches
Last 72 hours
Local Area Snow Depth
California Current Weather
California MOS Forecast Weather

Regional Weather Maps

(Automated weather data from NWS/FAA)

91739 WEATHER FORECAST
10-Day model forecast maps 2025 Hurricanes	RANCHO CUCAMONGA, CA 91739 Weather Forecast	Snowfall Forecast pages Snow Depth pages

TODAY
Partly cloudy this morning...becoming mostly sunny. Highs 100 to 107. Light winds becoming west 10 to 15 mph this afternoon.

TONIGHT
Mostly clear. Lows 69 to 75. Areas of winds west to 10 mph in the evening becoming light.

FRIDAY
Partly cloudy in the morning...becoming mostly sunny. Highs 100 to 107. Areas of winds west to 10 mph...becoming 10 to 15 mph with gusts to 25 mph in the afternoon.

FRIDAY NIGHT
A slight chance of thunderstorms in the evening. Partly cloudy with a slight chance of showers. Lows 69 to 75. Areas of winds west 10 to 15 mph in the evening becoming light. Chance of measurable precipitation 20 percent.

SATURDAY
Partly cloudy. A slight chance of showers and thunderstorms in the afternoon. Highs 98 to 105. Light winds becoming west 10 mph in the afternoon. Chance of measurable precipitation 20 percent.

SATURDAY NIGHT
Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly clear overnight. Lows 69 to 74.

SUNDAY
Partly cloudy. A chance of showers and thunderstorms in the afternoon. Highs 96 to 104.

SUNDAY NIGHT
Partly cloudy in the evening...becoming mostly clear. A slight chance of thunderstorms in the evening. A slight chance of showers. Lows 68 to 73.

MONDAY
Partly cloudy with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs 93 to 100.

MONDAY NIGHT
Partly cloudy in the evening...becoming mostly clear. A slight chance of thunderstorms in the evening. A slight chance of showers. Lows 65 to 70.

TUESDAY
Partly cloudy with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs 89 to 96.

TUESDAY NIGHT
Mostly clear. A slight chance of showers and thunderstorms in the evening. Lows 61 to 66.

WEDNESDAY
Mostly sunny in the morning, then partly cloudy with a slight chance of showers and thunderstorms in the afternoon. Highs 87 to 94.

91739 WEATHER SATELLITE LOOPS

Visible Weather Satellite
RANCHO CUCAMONGA, CA 91739

Infrared Weather Satellite
RANCHO CUCAMONGA, CA 91739

91739 WEATHER RADAR LOOP

NEXRAD Weather Radar
RANCHO CUCAMONGA, CA 91739

MOS COMPUTER WEATHER FORECAST

ONTARIO, CA 3 hourly weather forecast

weather forecast created 5:00 AM PDT 8/21/2025

DAY/DATE &
WEATHER FORECAST SUMMARY

Thursday
21 AUG 2025

11 AM

91°

89°

Partly Cloudy

3%

0% Thunder
( 0% severe)

SW 3

28%

53°

High 102°

2 PM

101°

99°

Partly Cloudy

WSW 9

20%

52°

Partly Cloudy

5 PM

99°

97°

Clear

4%

0% Thunder
( 0% severe)

WSW 13

22%

53°

8 PM

88°

86°

Partly Cloudy

WSW 8

29%

52°

Friday
22 AUG 2025

11 PM

81°

81°

Partly Cloudy

2%

0% Thunder
( 0% severe)

W 5

41%

55°

Low 74°

2 AM

78°

79°

Partly Cloudy

SW 2

47%

56°

High 102°

5 AM

76°

78°

Partly Cloudy

2%

0% Thunder
( 1% severe)

NNE 2

50%

56°

Partly Cloudy

8 AM

79°

80°

Partly Cloudy

E 1

45%

56°

11 AM

92°

90°

Partly Cloudy

8%

0% Thunder
( 5% severe)

SW 5

30%

56°

2 PM

100°

98°

Partly Cloudy

WSW 10

22%

54°

5 PM

97°

95°

Partly Cloudy

9%

0% Thunder
( 2% severe)

WSW 13

24%

54°

8 PM

87°

85°

Partly Cloudy

WSW 9

32%

54°

Saturday
23 AUG 2025

11 PM

80°

80°

Partly Cloudy

12%
RAIN
<.01 in

0% Thunder
( 4% severe)

WSW 5

44%

56°

Low 74°

2 AM

78°

79°

Partly Cloudy

WSW 3

48%

57°

High 100°

5 AM

76°

78°

Partly Cloudy

14%
RAIN
<.01 in

0% Thunder
( 6% severe)

W 2

54%

58°

Partly Cloudy

8 AM

78°

79°

Partly Cloudy

NW 2

52%

59°

11 AM

88°

87°

Partly Cloudy

15%
RAIN
<.01 in

0% Thunder
( 13% severe)

WSW 3

38%

59°

2 PM

97°

96°

Partly Cloudy

WSW 8

27%

57°

5 PM

95°

94°

Partly Cloudy

WSW 12

29%

58°


ONTARIO, CA extended weather forecast
Sunday 24 AUG 2025	Monday 25 AUG 2025	Tuesday 26 AUG 2025	Wednesday 27 AUG 2025	Thursday 28 AUG 2025
Low 74°	Low 72°	Low 68°	Low 66°	Low 64°
High 102°	High 99°	High 96°	High 93°	High 92°

Clear 2% Rain	Clear 2% Rain	Partly Cloudy 4% Rain	Partly Cloudy 2% Rain	Clear 2% Rain

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