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 Ontario Weather Forecast Summary |
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Today
May 12th
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Wednesday
May 13th
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Thursday
May 14th
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Friday
May 15th
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Saturday
May 16th
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Mostly Sunny |
Mostly Sunny |
Sunny |
Mostly Sunny |
Mix of Cloud and Sun |
87°F
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72°F
52°F |
72°F
45°F |
74°F
48°F |
59°F
44°F |
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| Ontario Detailed Weather Forecast |
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| Tuesday, May 12th, 2026 |
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Afternoon |
Temperature: 86°F |
| Mostly sunny. Chance of a thunderstorm. |
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Evening |
Temperature: 73°F |
| Clear. Chance of a thunderstorm. |
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| Wednesday, May 13th, 2026 |
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Overnight |
Temperature: 69°F |
| A mix of cloudy and clear skies. |
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Morning |
Temperature: 70°F |
| A mix of cloud and sun. Wind 20 to 30 mph. |
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Afternoon |
Temperature: 67°F |
| Mostly sunny. Wind 20 to 30 mph. |
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Evening |
Temperature: 55°F |
| Clear. Windy at times. |
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| Thursday, May 14th, 2026 |
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Overnight |
Temperature: 46°F |
| Clear. |
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Morning |
Temperature: 57°F |
| Sunny. |
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Afternoon |
Temperature: 71°F |
| Sunny. Windy at times. |
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Evening |
Temperature: 58°F |
| Clear. |
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| Friday, May 15th, 2026 |
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Overnight |
Temperature: 51°F |
| Mostly clear. Windy at times. |
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Morning |
Temperature: 59°F |
| Sunny. |
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Afternoon |
Temperature: 71°F |
| Sunny with cloudy periods. Windy at times. |
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Evening |
Temperature: 57°F |
| Clear with cloudy periods. Windy at times. |
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| Saturday, May 16th, 2026 |
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Overnight |
Temperature: 46°F |
| A mix of cloudy and clear skies. Windy at times. |
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Morning |
Temperature: 52°F |
| A mix of cloud and sun. Windy. |
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Afternoon |
Temperature: 59°F |
| Cloudy. Windy at times. |
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Evening |
Temperature: 50°F |
| Clear with cloudy periods. |
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| Sunday, May 17th, 2026 |
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Overnight |
Temperature: 41°F |
| Mostly clear. |
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Morning |
Temperature: 52°F |
| Sunny. Windy at times. |
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Afternoon |
Temperature: 64°F |
| Sunny. Windy at times. |
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Evening |
Temperature: 53°F |
| Clear. |
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| Monday, May 18th, 2026 |
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Overnight |
Temperature: 45°F |
| Clear with cloudy periods. |
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Morning |
Temperature: 58°F |
| Sunny. |
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Afternoon |
Temperature: 70°F |
| Sunny. Windy at times. |
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Evening |
Temperature: 56°F |
| Clear. |
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| Tuesday, May 19th, 2026 |
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Overnight |
Temperature: 48°F |
| Clear. |
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Morning |
Temperature: 61°F |
| Sunny. |
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Afternoon |
Temperature: 72°F |
| Mostly sunny. Windy at times. |
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Evening |
Temperature: 60°F |
| Mostly clear. |
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| Wednesday, May 20th, 2026 |
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Overnight |
Temperature: 53°F |
| Clear. |
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Morning |
Temperature: 67°F |
| Sunny. |
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Afternoon |
Temperature: 81°F |
| Mostly sunny. Windy at times. |
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Evening |
Temperature: 61°F |
| Clear. Windy at times. |
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