ONTARIO, CA 91758 Weather Forecast & Current Conditions

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ONTARIO, CA
Current Weather

10:53 PM PDT MAR 18, 2026
Clear
79°F
Feels Like: 78°F
Dewpoint: 43°F
Rel. Hum.: 28%
Visibility: 10 miles
Wind: Calm
Pressure: 30.07 inches
Last 72 hours

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ONTARIO, CA 91758
Weather Forecast

Snowfall Forecast pages
Snow Depth pages
TONIGHT
Clear. Lows 59 to 62 in wind sheltered areas to 62 to 71 in warmer locations. Areas of winds west 10 to 15 mph with gusts to 25 mph this evening becoming light.
THURSDAY
Sunny, hot. Highs 97 to 102. Light winds becoming west 10 to 15 mph in the afternoon.
THURSDAY NIGHT
Clear. Lows 60 to 64 in wind sheltered areas to 64 to 73 in warmer locations. Areas of winds west 10 to 15 mph in the evening becoming light.
FRIDAY
Sunny, hot. Highs 97 to 103. Areas of winds east to 10 mph becoming west with gusts to 25 mph in the afternoon.
FRIDAY NIGHT
Clear. Lows 56 to 60 in wind sheltered areas to 60 to 69 in warmer locations. Areas of winds west 10 to 15 mph with gusts to 25 mph in the evening becoming light.
SATURDAY
Mostly sunny. Highs 89 to 94.
SATURDAY NIGHT
Partly cloudy. Lows 54 to 62.
SUNDAY
Partly cloudy in the morning...becoming mostly sunny. Highs 86 to 92.
SUNDAY NIGHT
Clear. Lows 55 to 62.
MONDAY
Mostly sunny. Highs 89 to 94.
MONDAY NIGHT
Mostly clear. Lows 54 to 63.
TUESDAY
Partly cloudy in the morning...becoming mostly sunny. Highs 89 to 95.
TUESDAY NIGHT
Mostly clear. Lows 55 to 62.

Visible Weather Satellite
ONTARIO, CA 91758
Infrared Weather Satellite
ONTARIO, CA 91758
NEXRAD Weather Radar
ONTARIO, CA 91758

ONTARIO, CA 3 hourly weather forecast

weather forecast created  4:00 PM PST  3/18/2026
Thursday
19 MAR 2026
ONTARIO, CA 91758 weather forecast Day 1, 0 hours 10 PM 75° 75° Clear 0%

0% Thunder
( 0% severe)
NW   1 43% 51°
Low 67° ONTARIO, CA 91758 weather forecast Day 1, 3 hours 1 AM 70° 70° Clear   CALM 49% 50°
High 98° ONTARIO, CA 91758 weather forecast Day 1, 6 hours 4 AM 68° 68° Clear 0%

0% Thunder
( 0% severe)
  CALM 51% 49°

Clear



ONTARIO, CA 91758 weather forecast Day 1, 9 hours 7 AM 68° 68° Clear   CALM 53% 50°
ONTARIO, CA 91758 weather forecast Day 1, 12 hours 10 AM 85° 83° Clear 0%

0% Thunder
( 0% severe)
  CALM 28% 48°
ONTARIO, CA 91758 weather forecast Day 1, 15 hours 1 PM 96° 92° Clear WSW   7 17% 44°
ONTARIO, CA 91758 weather forecast Day 1, 18 hours 4 PM 97° 93° Clear 0%

0% Thunder
( 0% severe)
W   9 17% 45°
ONTARIO, CA 91758 weather forecast Day 1, 21 hours 7 PM 84° 82° Clear WSW   5 31% 50°
Friday
20 MAR 2026
ONTARIO, CA 91758 weather forecast Day 2, 0 hours 10 PM 77° 78° Clear 0%

0% Thunder
( 0% severe)
N   1 40% 51°
Low 66° ONTARIO, CA 91758 weather forecast Day 2, 3 hours 1 AM 72° 72° Clear   CALM 48% 51°
High 98° ONTARIO, CA 91758 weather forecast Day 2, 6 hours 4 AM 70° 70° Clear 0%

0% Thunder
( 0% severe)
  CALM 47% 49°

Clear



ONTARIO, CA 91758 weather forecast Day 2, 9 hours 7 AM 70° 70° Clear   CALM 45% 48°
ONTARIO, CA 91758 weather forecast Day 2, 12 hours 10 AM 86° 83° Clear 0%

0% Thunder
( 0% severe)
  CALM 26% 47°
ONTARIO, CA 91758 weather forecast Day 2, 15 hours 1 PM 96° 92° Clear WSW   8 16% 43°
ONTARIO, CA 91758 weather forecast Day 2, 18 hours 4 PM 95° 91° Clear 0%

0% Thunder
( 0% severe)
WSW   12 18% 45°
ONTARIO, CA 91758 weather forecast Day 2, 21 hours 7 PM 82° 81° Clear WSW   6 32% 49°

ONTARIO, CA extended weather forecast

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Low 63° Low 63° Low 60° Low 60° Low 60°
High 100° High 91° High 88° High 88° High 85°
ONTARIO, CA 91758 weather forecast Day 3 ONTARIO, CA 91758 weather forecast Day 4 ONTARIO, CA 91758 weather forecast Day 5 ONTARIO, CA 91758 weather forecast Day 6 ONTARIO, CA 91758 weather forecast Day 7
Clear
1% Rain
Partly Cloudy
2% Rain
Partly Cloudy
5% Rain
Partly Cloudy
7% Rain
Partly Cloudy
8% Rain
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