Yes
you do need a jacket based on the weather in Yosemite National Park, California, USA 1 second ago
Why? Because it's not very warm out!
57°F14°C & Mostly Cloudy
Wind is 2 mph4 km/h from the North, gusting to 5 mph8 km/h
| September 18 | ||||
| 12am | 56°F13°C | 4 mph6 km/h Northeast | Cloudy | |
| 1am | 56°F13°C | 4 mph7 km/h Northeast | Cloudy | |
| 2am | 55°F13°C | 4 mph7 km/h Northeast | Cloudy | |
| 3am | 54°F12°C | 5 mph8 km/h Northeast | Cloudy | |
| 4am | 54°F12°C | 4 mph6 km/h East | Cloudy | |
| 5am | 53°F12°C | 4 mph7 km/h East | Cloudy | |
| 6am | 53°F12°C | 5 mph8 km/h East | Cloudy | |
| 7am | 51°F11°C | 5 mph8 km/h East | Mostly Cloudy | |
| 8am | 51°F11°C | 5 mph8 km/h East | Cloudy | |
| 9am | 51°F11°C | 5 mph8 km/h East | Cloudy | |
| 10am | 52°F11°C | 5 mph8 km/h East | Cloudy | |
| 11am | 54°F12°C | 4 mph7 km/h East | Cloudy | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 17 | 49°F9°C | 70°F21°C | 4 mph7 km/h from West | Mostly Clear | Cloudy |
| September 18 | 48°F9°C | 63°F17°C | 4 mph7 km/h from Southeast | Cloudy | Drizzle |
| September 19 | 46°F8°C | 55°F13°C | 3 mph6 km/h from Southwest | Rain | Mostly Clear |
| September 20 | 43°F6°C | 61°F16°C | 5 mph8 km/h from West | Mostly Clear | Mostly Clear |
| September 21 | 45°F7°C | 63°F17°C | 5 mph8 km/h from West | Mostly Clear | Clear |
| September 22 | 48°F9°C | 69°F20°C | 5 mph8 km/h from Southwest | Clear | Mostly Clear |
| September 23 | 50°F10°C | 66°F19°C | 4 mph7 km/h from South | Rain | Mostly Clear |
Yes
Low of 48°F9°C, High of 63°F17°CWind: 4 mph7 km/h
Precipitation: 21% rain