Yes

you do need a jacket based on the weather in Lincoln, CA, USA 13 minutes ago

Why? Because there are strong winds blowing out there!
64°F18°C & Clear

Wind is 12 mph20 km/h from the NW, gusting to 25 mph41 km/h
October 17
11pm63°F17°C14 mph23 km/h NClear
October 18
12am60°F16°C12 mph20 km/h NClear
1am58°F14°C11 mph17 km/h NClear
2am56°F13°C10 mph17 km/h NClear
3am55°F13°C10 mph16 km/h NClear
4am53°F12°C10 mph16 km/h NClear
5am52°F11°C11 mph17 km/h NClear
6am50°F10°C11 mph18 km/h NClear
7am49°F10°C11 mph18 km/h NClear
8am48°F9°C11 mph18 km/h NClear
9am47°F8°C11 mph18 km/h NClear
10am46°F8°C10 mph17 km/h NClear
DateLowHighWindDayNight
October 1755°F13°C75°F24°C7 mph11 km/h from NWPartly CloudyClear
October 1846°F8°C77°F25°C14 mph22 km/h from NWClearMostly Clear
October 1949°F10°C78°F26°C5 mph8 km/h from SClearClear
October 2050°F10°C80°F27°C4 mph6 km/h from SMostly ClearMostly Cloudy
October 2153°F12°C79°F26°C5 mph8 km/h from SClearMostly Clear
October 2250°F10°C80°F27°C5 mph7 km/h from NWMostly ClearClear
October 2351°F11°C84°F29°C3 mph5 km/h from NWClearClear

Yes

Low of 46°F8°C, High of 77°F25°C
Wind: 14 mph22 km/h
Precipitation: None

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