ONTARIO, CA 91758 Weather Forecast & Current Conditions

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ONTARIO, CA
Current Weather

12:53 AM PDT AUG 17, 2026
Few Clouds
75°F
Feels Like: 75°F
Dewpoint: 57°F
Rel. Hum.: 54%
Visibility: 10 miles
Wind: SSW at 5 mph
Pressure: 30.03 inches
Last 72 hours

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ONTARIO, CA 91758
Weather Forecast

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Snow Depth pages
TODAY
Mostly sunny. Highs 93 to 100. Light winds becoming west 10 to 15 mph with gusts to 25 mph this afternoon.
TONIGHT
Mostly clear. Lows 64 to 69. Areas of winds west to 10 mph in the evening becoming light.
TUESDAY
Mostly sunny in the morning...becoming partly cloudy. Highs 95 to 101. Areas of winds west to 10 mph...becoming 10 to 15 mph in the afternoon.
TUESDAY NIGHT
Mostly clear in the evening...becoming partly cloudy. Lows 65 to 70. Areas of winds west to 10 mph in the evening becoming light.
WEDNESDAY
Partly cloudy in the morning...becoming mostly sunny. Highs 96 to 103. Light winds becoming west 10 to 15 mph in the afternoon.
WEDNESDAY NIGHT
Mostly clear in the evening...becoming partly cloudy. Lows 66 to 71.
THURSDAY
Mostly sunny. Highs 97 to 104.
THURSDAY NIGHT
Mostly clear. Lows 66 to 72.
FRIDAY
Mostly sunny. Highs 96 to 103.
FRIDAY NIGHT
Mostly clear. Lows 66 to 71.
SATURDAY
Mostly sunny. Highs 96 to 102.
SATURDAY NIGHT
Mostly clear. Lows 66 to 71.
SUNDAY
Mostly sunny. Highs 95 to 101.

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  5:00 PM PDT  8/16/2026
Monday
17 AUG 2026
ONTARIO, CA 91758 weather forecast Day 1, 0 hours 11 PM 74° 74° Partly Cloudy 0%

0% Thunder
( 0% severe)
WSW   6 57% 58°
Low 67° ONTARIO, CA 91758 weather forecast Day 1, 3 hours 2 AM 71° 71° Clear W   5 68% 60°
High 95° ONTARIO, CA 91758 weather forecast Day 1, 6 hours 5 AM 68° 68° Clear 1%

0% Thunder
( 0% severe)
W   5 78% 61°

Partly Cloudy



ONTARIO, CA 91758 weather forecast Day 1, 9 hours 8 AM 70° 70° Partly Cloudy   CALM 73% 61°
ONTARIO, CA 91758 weather forecast Day 1, 12 hours 11 AM 82° 82° Partly Cloudy 2%

0% Thunder
( 0% severe)
SW   5 46% 59°
ONTARIO, CA 91758 weather forecast Day 1, 15 hours 2 PM 91° 89° Partly Cloudy WSW   9 30% 55°
ONTARIO, CA 91758 weather forecast Day 1, 18 hours 5 PM 92° 90° Partly Cloudy 2%

0% Thunder
( 0% severe)
WSW   12 30% 56°
ONTARIO, CA 91758 weather forecast Day 1, 21 hours 8 PM 82° 82° Partly Cloudy WSW   7 41% 56°
Tuesday
18 AUG 2026
ONTARIO, CA 91758 weather forecast Day 2, 0 hours 11 PM 75° 75° Partly Cloudy 1%

0% Thunder
( 0% severe)
WSW   5 55% 58°
Low 68° ONTARIO, CA 91758 weather forecast Day 2, 3 hours 2 AM 72° 72° Partly Cloudy N   5 66% 60°
High 95° ONTARIO, CA 91758 weather forecast Day 2, 6 hours 5 AM 69° 69° Partly Cloudy 0%

0% Thunder
( 0% severe)
NE   3 73% 60°

Partly Cloudy



ONTARIO, CA 91758 weather forecast Day 2, 9 hours 8 AM 72° 72° Mostly Cloudy   CALM 68% 61°
ONTARIO, CA 91758 weather forecast Day 2, 12 hours 11 AM 84° 84° Partly Cloudy 0%

0% Thunder
( 0% severe)
SW   5 43% 59°
ONTARIO, CA 91758 weather forecast Day 2, 15 hours 2 PM 93° 91° Partly Cloudy WSW   8 29% 56°
ONTARIO, CA 91758 weather forecast Day 2, 18 hours 5 PM 93° 91° Partly Cloudy 0%

0% Thunder
( 0% severe)
WSW   10 29% 56°
ONTARIO, CA 91758 weather forecast Day 2, 21 hours 8 PM 83° 82° Clear WSW   7 41% 57°

ONTARIO, CA extended weather forecast

Wednesday
19 AUG 2026
Thursday
20 AUG 2026
Friday
21 AUG 2026
Saturday
22 AUG 2026
Sunday
23 AUG 2026
Low 69° Low 71° Low 71° Low 71° Low 73°
High 102° High 101° High 99° High 100° High 102°
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
Clear
Partly Cloudy
2% Rain
Clear
1% Rain
Clear
7% Rain
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