Ontario, CA Weather Forecast
Local 7-day forecast
Mostly Clear
Track current conditions, temperature changes, wind, and the full daily outlook for Ontario, CA in one place.
Mostly clear, with a low around 70. East wind around 5 mph.
Local Weather Overview
This forecast page for Ontario, CA is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Jul 17, 2026 2:18 AM PDT.
The active forecast window currently covers Jul 17 to Jul 23, 2026 for Ontario, CA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 17 to Jul 23, 2026
- Latest sync
- Jul 17, 2026 2:18 AM PDT
- Forecast office
- SGX
- Source
- NOAA / NWS
Daily Outlook
This Week in Ontario
Wednesday looks like the warmest upcoming period in Ontario at 96 degrees F.
Sunday Night is the coolest period ahead with temperatures near 66 degrees F.
The strongest winds are forecast for Friday at about 5 to 15 mph W.
The forecast from Jul 17 through Jul 23 stays mostly dry.
Forecast Details
- Last updated
- Jul 17, 2026 2:18 AM PDT
- Coverage
- 7 days
- Time zone
- America/Los_Angeles
- Forecast office
- SGX
- Radar station
- KSOX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly sunny, with a high near 91. West wind 5 to 15 mph, with gusts as high as 25 mph.
Mostly clear, with a low around 67. West wind 5 to 10 mph, with gusts as high as 20 mph.
Sunny, with a high near 92. West wind 5 to 15 mph, with gusts as high as 25 mph.
Mostly clear, with a low around 68. West wind 0 to 15 mph, with gusts as high as 25 mph.
Sunny, with a high near 91.
Mostly clear, with a low around 66.
Mostly sunny, with a high near 91.
Mostly clear, with a low around 66.
Sunny, with a high near 92.
Mostly clear, with a low around 67.
Sunny, with a high near 96.
Partly cloudy, with a low around 69.
Mostly sunny, with a high near 96.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Jul 17
|
Mostly Clear
|
70°F |
5 mph
E
|
|
Friday
Jul 17
|
Mostly Sunny
|
91°F |
5 to 15 mph
W
|
|
Friday Night
Jul 17
|
Mostly Clear
|
67°F |
5 to 10 mph
W
|
|
Saturday
Jul 18
|
Sunny
|
92°F |
5 to 15 mph
W
|
|
Saturday Night
Jul 18
|
Mostly Clear
|
68°F |
0 to 15 mph
W
|
|
Sunday
Jul 19
|
Sunny
|
91°F |
0 to 10 mph
SW
|
|
Sunday Night
Jul 19
|
Mostly Clear
|
66°F |
0 to 10 mph
SW
|
|
Monday
Jul 20
|
Mostly Sunny
|
91°F |
0 to 10 mph
SW
|
|
Monday Night
Jul 20
|
Mostly Clear
|
66°F |
0 to 10 mph
W
|
|
Tuesday
Jul 21
|
Sunny
|
92°F |
0 to 10 mph
SW
|
|
Tuesday Night
Jul 21
|
Mostly Clear
|
67°F |
0 to 10 mph
W
|
|
Wednesday
Jul 22
|
Sunny
|
96°F |
0 to 10 mph
SW
|
|
Wednesday Night
Jul 22
|
Partly Cloudy
|
69°F |
0 to 10 mph
SW
|
|
Thursday
Jul 23
|
Mostly Sunny
|
96°F |
0 to 10 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Ontario.
