Yes
you do need a jacket based on the weather in San Francisco (Financial District), California, United States 1 second ago
Why? Because there's a refreshing nip in the air!
49°F10°C & Mostly Clear
Wind is 4 mph6 km/h from the West, gusting to 6 mph10 km/h
| December 15 | ||||
| 1am | 49°F9°C | 4 mph7 km/h West | Mostly Clear | |
| 2am | 48°F9°C | 4 mph6 km/h West | Mostly Clear | |
| 3am | 48°F9°C | 4 mph6 km/h West | Mostly Clear | |
| 4am | 47°F8°C | 3 mph5 km/h Northwest | Mostly Clear | |
| 5am | 46°F8°C | 3 mph4 km/h Northwest | Mostly Clear | |
| 6am | 45°F7°C | 3 mph4 km/h West | Mostly Clear | |
| 7am | 45°F7°C | 3 mph5 km/h West | Mostly Clear | |
| 8am | 45°F7°C | 3 mph5 km/h North | Mostly Clear | |
| 9am | 44°F7°C | 3 mph5 km/h Northeast | Mostly Clear | |
| 10am | 44°F7°C | 3 mph5 km/h Northeast | Partly Cloudy | |
| 11am | 45°F7°C | 2 mph4 km/h Northeast | Partly Cloudy | |
| 12pm | 46°F8°C | 3 mph5 km/h Northeast | Partly Cloudy | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| December 14 | 48°F9°C | 55°F13°C | 12 mph19 km/h from West | Rain | Mostly Clear |
| December 15 | 44°F7°C | 55°F13°C | 4 mph6 km/h from Northeast | Mostly Cloudy | Drizzle |
| December 16 | 45°F7°C | 55°F13°C | 6 mph10 km/h from Southeast | Rain | Cloudy |
| December 17 | 47°F8°C | 58°F15°C | 4 mph6 km/h from North | Partly Cloudy | Mostly Cloudy |
| December 18 | 46°F8°C | 58°F15°C | 6 mph9 km/h from Northeast | Partly Cloudy | Partly Cloudy |
| December 19 | 46°F8°C | 58°F14°C | 7 mph11 km/h from Northeast | Partly Cloudy | Mostly Cloudy |
| December 20 | 45°F7°C | 58°F14°C | 5 mph8 km/h from Northeast | Cloudy | Rain |
Yes
Low of 45°F7°C, High of 55°F13°CWind: 4 mph6 km/h
Precipitation: None