Yes

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

Why? Because it's pretty chilly!
50°F10°C & Mostly Cloudy

Wind is 2 mph3 km/h from the South, gusting to 3 mph5 km/h
April 22
8am50°F10°C2 mph3 km/h SouthClear
9am50°F10°C2 mph4 km/h SouthMostly Clear
10am50°F10°C2 mph3 km/h SouthMostly Clear
11am55°F13°C2 mph4 km/h SouthPartly Cloudy
12pm60°F16°C2 mph3 km/h SouthwestMostly Cloudy
1pm65°F19°C2 mph4 km/h SouthwestMostly Cloudy
2pm69°F21°C4 mph7 km/h SouthwestPartly Cloudy
3pm72°F22°C6 mph9 km/h WestPartly Cloudy
4pm74°F23°C7 mph12 km/h WestPartly Cloudy
5pm75°F24°C9 mph14 km/h WestMostly Cloudy
6pm75°F24°C10 mph15 km/h WestMostly Cloudy
7pm74°F23°C10 mph16 km/h WestMostly Cloudy
DateLowHighWindDayNight
April 2250°F10°C75°F24°C6 mph10 km/h from WestPartly CloudyMostly Clear
April 2348°F9°C66°F19°C11 mph18 km/h from SouthwestPartly CloudyMostly Cloudy
April 2449°F9°C61°F16°C11 mph17 km/h from SouthwestCloudyCloudy
April 2547°F8°C59°F15°C11 mph17 km/h from SouthwestMostly CloudyDrizzle
April 2643°F6°C59°F15°C7 mph11 km/h from WestMostly CloudyMostly Cloudy
April 2746°F8°C64°F18°C7 mph11 km/h from SouthwestPartly CloudyClear
April 2844°F7°C72°F22°C6 mph9 km/h from WestClearClear

Yes

Low of 48°F9°C, High of 66°F19°C
Wind: 11 mph18 km/h
Precipitation: None

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