Yes

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

Why? Because sorry, it's too cool for just a hoodie and it's super windy outside!
55°F13°C & Windy

Wind is 15 mph24 km/h from the West, gusting to 29 mph47 km/h
March 14
8pm55°F13°C15 mph24 km/h WestWindy
9pm54°F12°C14 mph22 km/h WestMostly Clear
10pm51°F10°C10 mph17 km/h WestMostly Cloudy
11pm50°F10°C9 mph14 km/h WestMostly Cloudy
March 15
12am48°F9°C7 mph11 km/h WestMostly Cloudy
1am48°F9°C5 mph9 km/h WestMostly Cloudy
2am47°F8°C6 mph10 km/h WestPartly Cloudy
3am47°F8°C6 mph10 km/h WestPartly Cloudy
4am46°F8°C5 mph9 km/h WestPartly Cloudy
5am45°F7°C5 mph8 km/h WestPartly Cloudy
6am45°F7°C5 mph7 km/h WestPartly Cloudy
7am45°F7°C4 mph7 km/h SouthwestMostly Cloudy
DateLowHighWindDayNight
March 1442°F6°C57°F14°C11 mph18 km/h from SouthwestDrizzlePartly Cloudy
March 1544°F7°C58°F14°C6 mph9 km/h from SouthwestPartly CloudyMostly Clear
March 1643°F6°C61°F16°C11 mph18 km/h from SouthMostly CloudyRain
March 1746°F8°C57°F14°C12 mph19 km/h from WestRainClear
March 1842°F5°C57°F14°C5 mph8 km/h from WestMostly ClearPartly Cloudy
March 1939°F4°C59°F15°C4 mph7 km/h from SouthwestMostly CloudyDrizzle
March 2046°F8°C59°F15°C5 mph9 km/h from NorthwestPartly CloudyMostly Cloudy

Yes

Low of 44°F7°C, High of 58°F15°C
Wind: 6 mph9 km/h
Precipitation: None

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