Yes
you do need a jacket based on the weather in San Bernardino, CA, USA 1 second ago
Why? Because it's not very warm out.
51°F11°C & Mostly Clear
Wind is 2 mph3 km/h from the NE, gusting to 4 mph6 km/h
| April 20 | ||||
| 8am | 51°F11°C | 2 mph3 km/h NE | Partly Cloudy | |
| 9am | 52°F11°C | 2 mph3 km/h NE | Mostly Cloudy | |
| 10am | 53°F12°C | 1 mph2 km/h NE | Mostly Cloudy | |
| 11am | 54°F12°C | 1 mph2 km/h SW | Mostly Cloudy | |
| 12pm | 56°F13°C | 2 mph4 km/h SW | Mostly Cloudy | |
| 1pm | 59°F15°C | 3 mph4 km/h SW | Partly Cloudy | |
| 2pm | 62°F17°C | 2 mph4 km/h SW | Mostly Clear | |
| 3pm | 66°F19°C | 3 mph5 km/h SW | Clear | |
| 4pm | 70°F21°C | 3 mph5 km/h SW | Clear | |
| 5pm | 74°F23°C | 4 mph6 km/h W | Clear | |
| 6pm | 76°F25°C | 4 mph7 km/h W | Mostly Clear | |
| 7pm | 78°F25°C | 5 mph8 km/h W | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| April 20 | 51°F11°C | 78°F26°C | 3 mph6 km/h from SW | Mostly Clear | Clear |
| April 21 | 56°F13°C | 87°F30°C | 5 mph8 km/h from SW | Clear | Clear |
| April 22 | 58°F14°C | 81°F27°C | 6 mph9 km/h from SW | Clear | Partly Cloudy |
| April 23 | 55°F13°C | 73°F23°C | 5 mph9 km/h from SW | Mostly Clear | Mostly Clear |
| April 24 | 51°F10°C | 72°F22°C | 5 mph8 km/h from SW | Mostly Clear | Partly Cloudy |
| April 25 | 50°F10°C | 65°F18°C | 6 mph9 km/h from SW | Mostly Cloudy | Cloudy |
| April 26 | 51°F11°C | 61°F16°C | 4 mph7 km/h from SW | Drizzle | Drizzle |
Yes
Low of 56°F14°C, High of 87°F31°CWind: 5 mph8 km/h
Precipitation: None