Yes

you do need a jacket based on the weather in Hayward, CA 94545, USA 1 second ago

Why? Because it's not very warm out!
55°F13°C & Mostly Clear

Wind is 3 mph5 km/h from the Southwest, gusting to 7 mph12 km/h
August 5
7am55°F13°C4 mph7 km/h SouthwestMostly Clear
8am55°F13°C4 mph7 km/h SouthwestMostly Clear
9am55°F13°C4 mph6 km/h SouthwestMostly Clear
10am55°F13°C3 mph6 km/h SouthwestMostly Clear
11am57°F14°C4 mph6 km/h SouthwestMostly Clear
12pm59°F15°C4 mph6 km/h SouthwestMostly Clear
1pm62°F17°C5 mph8 km/h SouthwestPartly Cloudy
2pm64°F18°C5 mph9 km/h WestMostly Clear
3pm67°F19°C7 mph11 km/h WestMostly Clear
4pm69°F21°C8 mph13 km/h WestClear
5pm71°F22°C9 mph15 km/h WestClear
6pm71°F22°C10 mph15 km/h WestClear
DateLowHighWindDayNight
August 555°F13°C71°F22°C7 mph11 km/h from WestMostly ClearMostly Clear
August 656°F13°C79°F26°C6 mph10 km/h from WestMostly ClearPartly Cloudy
August 758°F15°C74°F24°C7 mph11 km/h from WestMostly ClearPartly Cloudy
August 857°F14°C78°F26°C5 mph8 km/h from NorthwestClearClear
August 958°F15°C79°F26°C6 mph10 km/h from NorthwestClearMostly Clear
August 1057°F14°C76°F25°C6 mph10 km/h from NorthwestMostly ClearMostly Clear
August 1157°F14°C72°F22°C7 mph10 km/h from NorthwestMostly ClearMostly Clear

Yes

Low of 55°F13°C, High of 80°F27°C
Wind: 6 mph10 km/h
Precipitation: None

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