ONTARIO, CA 91758 Weather Forecast & Current Conditions

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ONTARIO, CA
Current Weather

1:53 PM PDT MAY 17, 2026
Overcast
66°F
Feels Like: 66°F
Dewpoint: 52°F
Rel. Hum.: 61%
Visibility: 10 miles
Wind: WSW at 7 mph
Pressure: 29.77 inches
Last 72 hours

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ONTARIO, CA 91758
Weather Forecast

Snowfall Forecast pages
Snow Depth pages
TONIGHT
Mostly cloudy this evening...becoming partly cloudy. Patchy fog. Lows 48 to 54. Areas of winds south 10 to 20 mph. Gusts to 30 mph...becoming 35 mph overnight.
MONDAY
Partly cloudy with patchy fog in the morning...becoming mostly sunny. Highs 77 to 83. Areas of winds north 10 to 20 mph with gusts to 35 mph becoming west with gusts to 30 mph in the afternoon.
MONDAY NIGHT
Partly cloudy in the evening...becoming mostly clear. Lows around 50 in wind sheltered areas to 49 to 55 in warmer locations. Areas of winds west 10 to 20 mph with gusts to 30 mph in the evening becoming light.
TUESDAY
Mostly sunny. Highs 83 to 89. Areas of winds north to 10 mph becoming west in the afternoon. Gusts to 25 mph.
TUESDAY NIGHT
Mostly clear. Lows 50 to 53 in wind sheltered areas to 52 to 58 in warmer locations. Areas of winds west 10 to 15 mph with gusts to 25 mph in the evening becoming light.
WEDNESDAY
Mostly sunny. Highs 84 to 91.
WEDNESDAY NIGHT
Mostly clear. Lows 51 to 58.
THURSDAY
Mostly sunny. Highs 84 to 90.
THURSDAY NIGHT
Clear. Lows 51 to 58.
FRIDAY
Mostly sunny. Highs 82 to 89.
FRIDAY NIGHT
Mostly clear. Lows 51 to 57.
SATURDAY
Mostly sunny. Highs 81 to 88.
SATURDAY NIGHT
Clear. Lows 51 to 57.

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 AM PDT  5/17/2026
Sunday
17 MAY 2026
ONTARIO, CA 91758 weather forecast Day 1, 12 hours 11 AM 65° 65° Partly Cloudy 0%

0% Thunder
( 0% severe)
WSW   7 68% 54°
High 73° ONTARIO, CA 91758 weather forecast Day 1, 15 hours 2 PM 72° 72° Partly Cloudy WSW   12 49% 52°
Partly Cloudy



ONTARIO, CA 91758 weather forecast Day 1, 18 hours 5 PM 71° 71° Partly Cloudy 0%

0% Thunder
( 0% severe)
WSW   15 55% 54°
ONTARIO, CA 91758 weather forecast Day 1, 21 hours 8 PM 65° 65° Partly Cloudy WSW   13 70% 55°
Monday
18 MAY 2026
ONTARIO, CA 91758 weather forecast Day 2, 0 hours 11 PM 61° 60° Partly Cloudy 0%

0% Thunder
( 0% severe)
W   7 81% 55°
Low 55° ONTARIO, CA 91758 weather forecast Day 2, 3 hours 2 AM 59° 60° Partly Cloudy NW   3 80% 53°
High 83° ONTARIO, CA 91758 weather forecast Day 2, 6 hours 5 AM 56° 56° Clear 0%

0% Thunder
( 0% severe)
N   3 77% 49°

Clear



ONTARIO, CA 91758 weather forecast Day 2, 9 hours 8 AM 60° 60° Clear N   6 58% 45°
ONTARIO, CA 91758 weather forecast Day 2, 12 hours 11 AM 71° 71° Clear 0%

0% Thunder
( 0% severe)
NNE   6 27% 35°
ONTARIO, CA 91758 weather forecast Day 2, 15 hours 2 PM 79° 78° Clear NNE   6 14% 26°
ONTARIO, CA 91758 weather forecast Day 2, 18 hours 5 PM 78° 78° Clear 0%

0% Thunder
( 0% severe)
WSW   14 29% 43°
ONTARIO, CA 91758 weather forecast Day 2, 21 hours 8 PM 70° 70° Clear WSW   14 44% 47°
Tuesday
19 MAY 2026
ONTARIO, CA 91758 weather forecast Day 3, 0 hours 11 PM 63° 63° Clear 0%

0% Thunder
( 0% severe)
WSW   6 54% 46°
Low 55° ONTARIO, CA 91758 weather forecast Day 3, 3 hours 2 AM 59° 60° Clear   CALM 60% 45°
High 87° ONTARIO, CA 91758 weather forecast Day 3, 6 hours 5 AM 57° 58° Partly Cloudy 0%

0% Thunder
( 0% severe)
  CALM 59% 43°

Partly Cloudy



ONTARIO, CA 91758 weather forecast Day 3, 9 hours 8 AM 62° 63° Partly Cloudy   CALM 52% 44°
ONTARIO, CA 91758 weather forecast Day 3, 15 hours 11 AM 75° 75° Clear 0%

0% Thunder
( 0% severe)
SW   5 31% 42°
ONTARIO, CA 91758 weather forecast Day 3, 18 hours 2 PM 83° 81° Clear WSW   12 19% 37°
ONTARIO, CA 91758 weather forecast Day 3, 21 hours 5 PM 83° 81° Clear     WSW   14 24% 43°

ONTARIO, CA extended weather forecast

Wednesday
20 MAY 2026
Thursday
21 MAY 2026
Friday
22 MAY 2026
Saturday
23 MAY 2026
Sunday
24 MAY 2026
Low 57° Low 59° Low 60° Low 60° Low 60°
High 83° High 83° High 82° High 81° High 82°
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 <!--SEARCHED_TOWN_NAME--> weather forecast Day 8
Clear
2% Rain
Partly Cloudy
1% Rain
Mostly Cloudy
1% Rain
Mostly Cloudy
4% Rain
Mostly Cloudy
8% Rain
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