Ontario, CA Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Ontario, CA in one place.
Sunny, with a high near 102. Southwest wind 0 to 10 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: Aug 23, 2026 11:51 AM PDT.
The active forecast window currently covers Aug 23 to Aug 29, 2026 for Ontario, CA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Aug 23 to Aug 29, 2026
- Latest sync
- Aug 23, 2026 11:51 AM PDT
- Forecast office
- SGX
- Source
- NOAA / NWS
Daily Outlook
This Week in Ontario
Friday looks like the warmest upcoming period in Ontario at 105 degrees F.
Monday Night is the coolest period ahead with temperatures near 71 degrees F.
The strongest winds are forecast for Today at about 0 to 10 mph SW.
The forecast from Aug 23 through Aug 29 stays mostly dry.
Forecast Details
- Last updated
- Aug 23, 2026 11:51 AM PDT
- Coverage
- 8 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 clear, with a low around 72. Northwest wind 0 to 10 mph.
Sunny, with a high near 101. South wind 0 to 10 mph, with gusts as high as 20 mph.
Mostly clear, with a low around 71. West wind 0 to 10 mph.
Sunny, with a high near 102. West wind 0 to 10 mph, with gusts as high as 25 mph.
Mostly clear, with a low around 74.
Sunny, with a high near 102.
Mostly clear, with a low around 74.
Sunny, with a high near 104.
Partly cloudy, with a low around 74.
Mostly sunny, with a high near 105.
Mostly clear, with a low around 74.
Sunny, with a high near 104.
Mostly clear, with a low around 74.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
Aug 23
|
Sunny
|
102°F |
0 to 10 mph
SW
|
|
Tonight
Aug 23
|
Mostly Clear
|
72°F |
0 to 10 mph
NW
|
|
Monday
Aug 24
|
Sunny
|
101°F |
0 to 10 mph
S
|
|
Monday Night
Aug 24
|
Mostly Clear
|
71°F |
0 to 10 mph
W
|
|
Tuesday
Aug 25
|
Sunny
|
102°F |
0 to 10 mph
W
|
|
Tuesday Night
Aug 25
|
Mostly Clear
|
74°F |
0 to 10 mph
W
|
|
Wednesday
Aug 26
|
Sunny
|
102°F |
0 to 10 mph
W
|
|
Wednesday Night
Aug 26
|
Mostly Clear
|
74°F |
0 to 10 mph
W
|
|
Thursday
Aug 27
|
Sunny
|
104°F |
0 to 10 mph
W
|
|
Thursday Night
Aug 27
|
Partly Cloudy
|
74°F |
0 to 10 mph
W
|
|
Friday
Aug 28
|
Mostly Sunny
|
105°F |
0 to 10 mph
W
|
|
Friday Night
Aug 28
|
Mostly Clear
|
74°F |
0 to 10 mph
NW
|
|
Saturday
Aug 29
|
Sunny
|
104°F |
0 to 10 mph
W
|
|
Saturday Night
Aug 29
|
Mostly Clear
|
74°F |
0 to 10 mph
W
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Ontario.
