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 Pasadena, CA 91106, USA as of May 25, 2020 6:46am local time.

Now

Clear
Temp: 60°F16°C
Wind: 1 MPH2 KPH
Precipitation: None

Today

Next 2 hours: Yes

Next 4 hours: Yes

Next 8 hours: Yes

Tomorrow

No

Clear throughout the day.
Low of 64°F18°C, High of 93°F34°C
Wind: 4 MPH7 KPH
Precipitation: 1% rain