Yes

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

Why? Because just cool enough for a jacket, but not warm enough to ditch it and the wind is offering free, unsolicited face massages!
50°F10°C & Mostly Cloudy

Wind is 7 mph12 km/h from the West, gusting to 22 mph35 km/h
March 14
11pm50°F10°C7 mph11 km/h WestPartly Cloudy
March 15
12am49°F9°C6 mph9 km/h WestPartly Cloudy
1am48°F9°C6 mph10 km/h WestPartly Cloudy
2am47°F8°C6 mph9 km/h WestPartly Cloudy
3am46°F8°C6 mph9 km/h WestMostly Cloudy
4am46°F8°C5 mph7 km/h WestMostly Cloudy
5am45°F7°C4 mph6 km/h WestMostly Clear
6am45°F7°C4 mph7 km/h SouthwestPartly Cloudy
7am45°F7°C4 mph6 km/h SouthwestPartly Cloudy
8am44°F7°C3 mph5 km/h SouthwestMostly Cloudy
9am44°F7°C3 mph5 km/h SouthMostly Cloudy
10am44°F7°C4 mph6 km/h SouthMostly Cloudy
DateLowHighWindDayNight
March 1442°F6°C57°F14°C10 mph16 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°C56°F14°C12 mph20 km/h from WestRainClear
March 1842°F6°C58°F14°C5 mph8 km/h from WestMostly ClearPartly Cloudy
March 1939°F4°C58°F15°C4 mph7 km/h from SouthwestCloudyDrizzle
March 2046°F8°C58°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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