Yes
you do need a jacket based on the weather in Ontario, CA 91761, USA 1 second ago
Why? Because it's cool. Pleasantly cool, but cool.
55°F13°C & Mostly Clear
Wind is 2 mph3 km/h from the NE, gusting to 4 mph7 km/h
| April 16 | ||||
| 3am | 55°F13°C | 2 mph4 km/h NE | Mostly Clear | |
| 4am | 54°F12°C | 3 mph5 km/h NE | Mostly Clear | |
| 5am | 53°F12°C | 3 mph5 km/h NE | Mostly Clear | |
| 6am | 52°F11°C | 3 mph6 km/h NE | Mostly Clear | |
| 7am | 52°F11°C | 4 mph6 km/h NE | Clear | |
| 8am | 51°F11°C | 4 mph6 km/h NE | Clear | |
| 9am | 51°F11°C | 4 mph6 km/h NE | Clear | |
| 10am | 52°F11°C | 4 mph6 km/h NE | Clear | |
| 11am | 56°F13°C | 3 mph4 km/h NE | Clear | |
| 12pm | 60°F16°C | 2 mph4 km/h E | Clear | |
| 1pm | 64°F18°C | 2 mph4 km/h E | Clear | |
| 2pm | 69°F20°C | 2 mph4 km/h SW | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| April 15 | 48°F9°C | 69°F20°C | 3 mph6 km/h from W | Mostly Clear | Mostly Clear |
| April 16 | 51°F11°C | 79°F26°C | 6 mph9 km/h from W | Clear | Clear |
| April 17 | 54°F12°C | 78°F26°C | 5 mph8 km/h from SW | Partly Cloudy | Cloudy |
| April 18 | 55°F13°C | 74°F24°C | 5 mph7 km/h from SW | Mostly Cloudy | Mostly Clear |
| April 19 | 54°F12°C | 72°F22°C | 5 mph9 km/h from SW | Mostly Clear | Mostly Clear |
| April 20 | 53°F12°C | 76°F24°C | 5 mph9 km/h from W | Mostly Clear | Clear |
| April 21 | 58°F14°C | 85°F30°C | 6 mph10 km/h from W | Clear | Clear |
Yes
Low of 51°F11°C, High of 80°F27°CWind: 6 mph9 km/h
Precipitation: None