Yes
you do need a jacket based on the weather in San Francisco, CA, USA 1 second ago
Why? Because it's not very warm out.
51°F11°C & Partly Cloudy
Wind is 7 mph12 km/h from the SW, gusting to 13 mph21 km/h
| April 20 | ||||
| 7am | 51°F11°C | 7 mph11 km/h SW | Mostly Cloudy | |
| 8am | 52°F11°C | 7 mph11 km/h SW | Mostly Cloudy | |
| 9am | 52°F11°C | 7 mph11 km/h SW | Cloudy | |
| 10am | 53°F11°C | 6 mph10 km/h SW | Mostly Cloudy | |
| 11am | 54°F12°C | 6 mph10 km/h SW | Partly Cloudy | |
| 12pm | 57°F14°C | 6 mph10 km/h SW | Partly Cloudy | |
| 1pm | 59°F15°C | 7 mph11 km/h SW | Mostly Clear | |
| 2pm | 61°F16°C | 8 mph12 km/h SW | Mostly Clear | |
| 3pm | 61°F16°C | 9 mph14 km/h W | Clear | |
| 4pm | 63°F17°C | 10 mph17 km/h W | Clear | |
| 5pm | 64°F18°C | 11 mph18 km/h W | Clear | |
| 6pm | 65°F18°C | 12 mph20 km/h W | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| April 20 | 51°F10°C | 66°F19°C | 10 mph15 km/h from W | Mostly Clear | Mostly Clear |
| April 21 | 53°F12°C | 66°F19°C | 6 mph9 km/h from W | Clear | Mostly Clear |
| April 22 | 53°F11°C | 67°F19°C | 9 mph14 km/h from SW | Mostly Clear | Partly Cloudy |
| April 23 | 53°F12°C | 61°F16°C | 12 mph19 km/h from SW | Partly Cloudy | Mostly Cloudy |
| April 24 | 53°F12°C | 61°F16°C | 9 mph15 km/h from SW | Mostly Cloudy | Partly Cloudy |
| April 25 | 51°F11°C | 60°F15°C | 14 mph22 km/h from W | Partly Cloudy | Mostly Cloudy |
| April 26 | 52°F11°C | 60°F16°C | 15 mph24 km/h from W | Drizzle | Mostly Clear |
Yes
Low of 53°F12°C, High of 66°F19°CWind: 6 mph9 km/h
Precipitation: None