No

you don't need a jacket based on the weather in San Diego, CA, USA 2 minutes ago

70°F21°C & Mostly Clear

Wind is 7 mph12 km/h from the West, gusting to 11 mph18 km/h
July 26
10pm68°F20°C7 mph11 km/h WestMostly Cloudy
11pm67°F19°C6 mph9 km/h NorthwestPartly Cloudy
July 27
12am66°F19°C5 mph8 km/h NorthwestPartly Cloudy
1am65°F18°C3 mph5 km/h NorthwestMostly Clear
2am64°F18°C3 mph4 km/h NorthwestMostly Clear
3am63°F17°C2 mph4 km/h NorthwestMostly Clear
4am62°F17°C2 mph3 km/h NorthwestMostly Clear
5am62°F17°C2 mph3 km/h NorthPartly Cloudy
6am62°F16°C2 mph3 km/h NorthPartly Cloudy
7am61°F16°C2 mph4 km/h NortheastPartly Cloudy
8am61°F16°C3 mph5 km/h NortheastPartly Cloudy
9am61°F16°C3 mph5 km/h NortheastMostly Clear
DateLowHighWindDayNight
July 2663°F17°C72°F22°C7 mph11 km/h from WestPartly CloudyPartly Cloudy
July 2761°F16°C74°F23°C7 mph11 km/h from WestMostly ClearPartly Cloudy
July 2862°F17°C74°F23°C7 mph12 km/h from WestMostly ClearPartly Cloudy
July 2963°F17°C76°F24°C7 mph12 km/h from NorthwestMostly ClearMostly Clear
July 3062°F17°C75°F24°C6 mph10 km/h from WestMostly ClearMostly Clear
July 3163°F17°C73°F23°C6 mph9 km/h from WestMostly ClearPartly Cloudy
August 162°F17°C74°F23°C6 mph9 km/h from WestMostly ClearPartly Cloudy

No

Low of 61°F16°C, High of 73°F23°C
Wind: 7 mph11 km/h
Precipitation: None

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