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City of Ontario, CAOntario, CA 7-Day Weather Forecast
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Ontario Weather Forecast
Ontario, CA Weather Forecast Date: 1134 AM PDT Sun Sep 20 2026
Weather forecast for Ontario, CA
Tonight Lo: 60°F Lo: 16°C |
Tonight... Partly cloudy this evening...Becoming mostly cloudy. Lows 56 to 62. Areas of winds west 10 mph this evening becoming light. |
Mon Hi: 80°FHi: 27°C Lo: 57°F Lo: 14°C |
Monday... Mostly cloudy in the morning...Becoming mostly sunny. Highs 77 to 82. Light winds becoming southwest 10 to 15 mph in the afternoon. |
Tue Hi: 84°FHi: 29°C Lo: 62°F Lo: 17°C |
Tuesday... Partly cloudy in the morning...Becoming sunny. Highs 81 to 86. Light winds becoming west 10 mph in the afternoon. |
Wed Hi: 94°FHi: 34°C Lo: 66°F Lo: 19°C |
Wednesday... Mostly sunny. Warmer. Highs 90 to 96. |
| Thu Hi: 95°FHi: 35°C Lo: 66°F Lo: 19°C |
Thursday... Mostly sunny. Highs 92 to 97. |
| Fri Hi: 93°FHi: 34°C Lo: 64°F Lo: 18°C |
Friday... Mostly sunny. Highs 90 to 95. |
| Sat Hi: 91°FHi: 33°C Lo: 63°F Lo: 17°C |
Saturday... Partly cloudy. Highs 88 to 93. |
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