Yes

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

Why? Because you're not freezing, but you’ll definitely start complaining if it lasts much longer and it's so windy, even the squirrels are holding onto branches for dear life!
50°F10°C & Mostly Cloudy

Wind is 6 mph10 km/h from the West, gusting to 21 mph33 km/h
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
11am45°F7°C4 mph7 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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