Yes

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

Why? Because it's not very warm out.
56°F13°C & Mostly Cloudy

Wind is 3 mph5 km/h from the NE, gusting to 6 mph9 km/h
May 10
9am56°F13°C3 mph5 km/h NEPartly Cloudy
10am57°F14°C3 mph4 km/h NEMostly Cloudy
11am59°F15°C2 mph3 km/h NMostly Cloudy
12pm61°F16°C3 mph5 km/h WPartly Cloudy
1pm64°F18°C5 mph8 km/h WPartly Cloudy
2pm66°F19°C7 mph11 km/h WPartly Cloudy
3pm67°F19°C9 mph14 km/h WMostly Clear
4pm68°F20°C10 mph16 km/h WMostly Clear
5pm68°F20°C11 mph17 km/h WPartly Cloudy
6pm68°F20°C10 mph17 km/h WPartly Cloudy
7pm67°F19°C9 mph15 km/h WPartly Cloudy
8pm66°F19°C8 mph13 km/h WPartly Cloudy
DateLowHighWindDayNight
May 1055°F13°C68°F20°C7 mph12 km/h from WPartly CloudyPartly Cloudy
May 1158°F14°C70°F21°C7 mph11 km/h from WMostly ClearPartly Cloudy
May 1257°F14°C71°F22°C6 mph10 km/h from SWMostly ClearPartly Cloudy
May 1358°F15°C69°F21°C7 mph11 km/h from SWPartly CloudyMostly Cloudy
May 1458°F14°C68°F20°C8 mph12 km/h from SWPartly CloudyMostly Cloudy
May 1557°F14°C67°F19°C7 mph12 km/h from WPartly CloudyPartly Cloudy
May 1658°F15°C68°F20°C7 mph12 km/h from WPartly CloudyPartly Cloudy

Yes

Low of 58°F15°C, High of 70°F21°C
Wind: 7 mph11 km/h
Precipitation: None

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