Yes
you do need a jacket based on the weather in Ontario, CA, USA 1 second ago
Why? Because it's quite chilly and it's fairly windy outside!
49°F9°C & Partly Cloudy
Wind is 7 mph12 km/h from the West, gusting to 20 mph32 km/h
| March 18 | ||||
| 1am | 48°F9°C | 6 mph10 km/h West | Clear | |
| 2am | 47°F8°C | 3 mph5 km/h West | Clear | |
| 3am | 46°F8°C | 3 mph6 km/h West | Clear | |
| 4am | 44°F7°C | 3 mph5 km/h Northwest | Clear | |
| 5am | 43°F6°C | 4 mph7 km/h West | Clear | |
| 6am | 42°F6°C | 6 mph9 km/h West | Clear | |
| 7am | 41°F5°C | 4 mph7 km/h West | Clear | |
| 8am | 41°F5°C | 3 mph5 km/h Northeast | Mostly Clear | |
| 9am | 42°F5°C | 4 mph6 km/h Northeast | Mostly Clear | |
| 10am | 41°F5°C | 3 mph5 km/h Northeast | Mostly Clear | |
| 11am | 43°F6°C | 3 mph5 km/h Northeast | Mostly Clear | |
| 12pm | 47°F8°C | 4 mph6 km/h East | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| March 17 | 46°F8°C | 66°F19°C | 6 mph9 km/h from Southwest | Rain | Mostly Clear |
| March 18 | 41°F5°C | 64°F18°C | 5 mph8 km/h from Southwest | Clear | Clear |
| March 19 | 46°F8°C | 71°F22°C | 5 mph7 km/h from Southeast | Clear | Mostly Clear |
| March 20 | 49°F9°C | 70°F21°C | 5 mph7 km/h from Southwest | Clear | Clear |
| March 21 | 50°F10°C | 72°F22°C | 4 mph7 km/h from Southwest | Mostly Clear | Mostly Clear |
| March 22 | 49°F10°C | 70°F21°C | 4 mph7 km/h from Southwest | Mostly Clear | Mostly Clear |
| March 23 | 51°F11°C | 79°F26°C | 4 mph6 km/h from West | Clear | Clear |
Yes
Low of 41°F5°C, High of 64°F18°CWind: 5 mph8 km/h
Precipitation: None