TEST MODE
Now accepting affiliate applications in hundreds of markets across the country. Run your town's Community Observer and earn up to 75% of the ad revenue. See how it worksOntario does not have an affiliate yet. Be the one. Apply for OntarioTest mode: games, boards and entries really work, prizes and payments are not real. Open the Test Lab and tell us what to keep.
OntarioCommunity Observer

Monday, November 2 · updated 5 hr ago

Ontario

California

52°
Mostly ClearLow 51°
Wind5 mph NE
Chance of rain0%
Monday73° Sunny
Photo: Wikimedia Commons

Next 12 hours

Hour by hour from the National Weather Service

Now
52°
5am
51°
6am
51°
7am
53°
8am
58°
9am
62°
10am
66°
11am
68°
12pm
71°
1pm
72°
2pm
72°
3pm
72°

7 day forecast

Highs and lows for the week

OvernightMostly Clear51°
MonSunny55°
73°
TueSunny54°
74°
WedSunny55°
74°
ThuSunny55°
77°
FriSunny57°
79°
SatSunny58°
82°

Live radar and maps

Radar map by Windy

Open this forecast on weather.gov

Plan your day in Ontario

For a nice day outside

Picked for today's weather in Ontario.

🛒Shop For a nice day outside on AmazonSee what is popular →

As an Amazon Associate, community.observer earns from qualifying purchases. Prices and availability are shown as of the time they were last checked and can change.

Cheap flights from Fontana

Fares from the nearest big airport.

Loading Cheap flights from Fontana...

Travel deals come from our partner Travelpayouts. If you book through them, community.observer may earn a commission at no extra cost to you.

Forecast in detail

Overnight, 51°. Mostly clear, with a low around 51. Northeast wind around 5 mph.

Monday, 73°. Sunny, with a high near 73. West wind 0 to 5 mph.

Monday Night, 55°. Mostly clear, with a low around 55. North wind 0 to 5 mph.

Tuesday, 74°. Sunny, with a high near 74. West wind 0 to 10 mph.

Tuesday Night, 54°. Mostly clear, with a low around 54. Southeast wind 5 to 10 mph.

Wednesday, 74°. Sunny, with a high near 74.

Wednesday Night, 55°. Mostly clear, with a low around 55.

Thursday, 77°. Sunny, with a high near 77.

Thursday Night, 55°. Mostly clear, with a low around 55.

Friday, 79°. Sunny, with a high near 79.