No

Why? Because you should be inside at home! #StayHome

But if you absolutely had to go out to get groceries, medication or other essential travel, No, you don't need a jacket.

Based on the weather in San Francisco, CA 94158, USA as of May 25, 2020 6:10am local time.

Now

Clear
Temp: 60°F16°C
Wind: 2 MPH3 KPH
Precipitation: None

Today

Next 2 hours: No

Next 4 hours: No

Next 8 hours: No

Tomorrow

Yes

Clear throughout the day.
Low of 56°F14°C, High of 73°F23°C
Wind: 5 MPH9 KPH
Precipitation: 2% rain