| National Weather Service Forecast for:
Ontario International Arpt CA Issued by: National Weather Service San Diego, CA |
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| Updated: 12:05 pm PDT Jul 12, 2026 | ||||||||||||||||||
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| Tonight |
Partly cloudy, with a low around 67. West wind 5 to 10 mph, with gusts as high as 20 mph. |
| Monday |
Mostly sunny, with a high near 94. Light south wind becoming west 5 to 10 mph in the morning. Winds could gust as high as 20 mph. |
| Monday Night |
Partly cloudy, with a low around 68. Southwest wind 5 to 10 mph becoming light after midnight. Winds could gust as high as 20 mph. |
| Tuesday |
Sunny, with a high near 99. Light south wind becoming west 10 to 15 mph in the afternoon. Winds could gust as high as 20 mph. |
| Tuesday Night |
Mostly clear, with a low around 72. West wind 5 to 15 mph, with gusts as high as 20 mph. |
| Wednesday |
Sunny, with a high near 105. |
| Wednesday Night |
Mostly clear, with a low around 75. |
| Thursday |
A slight chance of showers after 11am. Sunny, with a high near 101. |
| Thursday Night |
A slight chance of showers before 11pm. Mostly clear, with a low around 70. |
| Friday |
A slight chance of showers after 11am. Mostly sunny, with a high near 94. |
| Friday Night |
A slight chance of showers. Partly cloudy, with a low around 68. |
| Saturday |
A slight chance of showers. Mostly sunny, with a high near 93. |
| Saturday Night |
A slight chance of showers. Mostly clear, with a low around 67. |
| Sunday |
A slight chance of showers. Sunny, with a high near 92. |
Forecast from NOAA-NWS for Ontario International Arpt CA.
