Yes

you do need a jacket based on the weather in Anaheim, CA, USA 1 second ago

Why? Because it's not very warm out.
55°F13°C & Partly Cloudy

Wind is 3 mph5 km/h from the SE, gusting to 9 mph14 km/h
April 26
5am55°F13°C4 mph6 km/h SEPartly Cloudy
6am54°F12°C4 mph6 km/h SEMostly Cloudy
7am54°F12°C3 mph5 km/h SEPartly Cloudy
8am54°F12°C3 mph5 km/h SEPartly Cloudy
9am55°F13°C3 mph4 km/h SEMostly Cloudy
10am56°F13°C3 mph5 km/h SEMostly Cloudy
11am57°F14°C4 mph7 km/h SMostly Cloudy
12pm59°F15°C4 mph7 km/h SMostly Cloudy
1pm62°F17°C5 mph8 km/h SWMostly Cloudy
2pm64°F18°C6 mph10 km/h SWPartly Cloudy
3pm66°F19°C8 mph14 km/h SWPartly Cloudy
4pm67°F20°C11 mph17 km/h SWMostly Clear
DateLowHighWindDayNight
April 2654°F12°C70°F21°C9 mph14 km/h from SWPartly CloudyMostly Clear
April 2753°F12°C72°F22°C7 mph11 km/h from SWMostly ClearClear
April 2853°F12°C75°F24°C6 mph10 km/h from SWClearClear
April 2956°F13°C77°F25°C6 mph9 km/h from SWClearClear
April 3055°F13°C77°F25°C7 mph11 km/h from SWClearMostly Clear
May 156°F13°C75°F24°C6 mph10 km/h from SWMostly ClearMostly Clear
May 256°F13°C75°F24°C7 mph11 km/h from SWMostly ClearMostly Clear

Yes

Low of 53°F12°C, High of 73°F23°C
Wind: 7 mph11 km/h
Precipitation: None

Support This Page