Yes

you do need a jacket based on the weather in Seaside, CA 93955, USA 6 minutes ago

Why? Because it's on the windy side!
61°F16°C & Clear

Wind is 11 mph17 km/h from the W, gusting to 22 mph36 km/h
October 17
9pm60°F15°C9 mph15 km/h WClear
10pm58°F14°C7 mph11 km/h WClear
11pm56°F13°C4 mph6 km/h WClear
October 18
12am54°F12°C4 mph6 km/h SClear
1am53°F12°C4 mph7 km/h SClear
2am53°F12°C4 mph6 km/h SClear
3am52°F11°C2 mph4 km/h SClear
4am51°F11°C3 mph6 km/h NClear
5am50°F10°C4 mph6 km/h NClear
6am49°F9°C3 mph6 km/h NClear
7am48°F9°C4 mph6 km/h SClear
8am47°F8°C4 mph6 km/h SClear
DateLowHighWindDayNight
October 1751°F11°C63°F17°C10 mph16 km/h from WMostly ClearClear
October 1846°F8°C68°F20°C4 mph7 km/h from NWClearMostly Clear
October 1947°F9°C72°F22°C4 mph7 km/h from NWClearClear
October 2048°F9°C72°F22°C4 mph7 km/h from NWMostly ClearPartly Cloudy
October 2148°F9°C69°F21°C4 mph7 km/h from WMostly ClearMostly Clear
October 2248°F9°C70°F21°C4 mph7 km/h from NWMostly ClearClear
October 2351°F11°C74°F23°C4 mph6 km/h from NWClearMostly Clear

Yes

Low of 46°F8°C, High of 69°F21°C
Wind: 4 mph7 km/h
Precipitation: None

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