| National Weather Service Forecast for:
Ontario International Arpt CA Issued by: National Weather Service San Diego, CA |
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| Updated: 8:48 pm PST Nov 1, 2026 | ||||||||||||||||||
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| Tonight |
Mostly clear, with a low around 52. Calm wind becoming northeast around 5 mph after midnight. |
| Monday |
Sunny, with a high near 75. Calm wind becoming west around 5 mph in the afternoon. |
| Monday Night |
Partly cloudy, with a low around 55. West wind around 5 mph becoming calm in the evening. |
| Tuesday |
Sunny, with a high near 73. Light and variable wind becoming southwest 5 to 10 mph in the afternoon. |
| Tuesday Night |
Mostly clear, with a low around 53. West wind around 5 mph becoming northeast after midnight. |
| Wednesday |
Sunny, with a high near 74. |
| Wednesday Night |
Mostly clear, with a low around 56. |
| Thursday |
Sunny, with a high near 76. |
| Thursday Night |
Mostly clear, with a low around 55. |
| Friday |
Sunny, with a high near 80. |
| Friday Night |
Clear, with a low around 58. |
| Saturday |
Sunny, with a high near 82. |
| Saturday Night |
Mostly clear, with a low around 59. |
| Sunday |
Sunny, with a high near 82. |
Forecast from NOAA-NWS for Ontario International Arpt CA.
