Yes
you do need a jacket based on the weather in San Francisco, CA, USA 1 second ago
Why? Because it's cool. Pleasantly cool, but cool.
56°F13°C & Mostly Cloudy
Wind is 9 mph14 km/h from the SW, gusting to 15 mph24 km/h
| April 18 | ||||
| 11pm | 55°F13°C | 8 mph13 km/h SW | Mostly Cloudy | |
| April 19 | ||||
| 12am | 54°F12°C | 7 mph11 km/h SW | Mostly Cloudy | |
| 1am | 54°F12°C | 7 mph11 km/h SW | Mostly Cloudy | |
| 2am | 54°F12°C | 7 mph11 km/h SW | Mostly Cloudy | |
| 3am | 54°F12°C | 7 mph11 km/h SW | Mostly Cloudy | |
| 4am | 53°F12°C | 7 mph11 km/h SW | Mostly Cloudy | |
| 5am | 53°F11°C | 6 mph10 km/h SW | Mostly Cloudy | |
| 6am | 52°F11°C | 7 mph11 km/h SW | Cloudy | |
| 7am | 52°F11°C | 6 mph10 km/h SW | Cloudy | |
| 8am | 52°F11°C | 6 mph10 km/h SW | Cloudy | |
| 9am | 51°F11°C | 6 mph10 km/h SW | Cloudy | |
| 10am | 52°F11°C | 6 mph10 km/h SW | Mostly Cloudy | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| April 18 | 51°F11°C | 66°F19°C | 6 mph9 km/h from W | Partly Cloudy | Mostly Cloudy |
| April 19 | 51°F11°C | 62°F17°C | 9 mph15 km/h from SW | Mostly Clear | Partly Cloudy |
| April 20 | 52°F11°C | 66°F19°C | 10 mph16 km/h from W | Mostly Clear | Clear |
| April 21 | 52°F11°C | 66°F19°C | 6 mph9 km/h from W | Mostly Clear | Partly Cloudy |
| April 22 | 52°F11°C | 64°F18°C | 9 mph15 km/h from SW | Mostly Clear | Partly Cloudy |
| April 23 | 53°F12°C | 61°F16°C | 12 mph20 km/h from SW | Mostly Cloudy | Partly Cloudy |
| April 24 | 52°F11°C | 59°F15°C | 10 mph16 km/h from SW | Mostly Cloudy | Mostly Cloudy |
Yes
Low of 51°F11°C, High of 62°F17°CWind: 9 mph15 km/h
Precipitation: None