Yes

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

Why? Because it's cool. Pleasantly cool, but cool.
51°F11°C & Partly Cloudy

Wind is 9 mph14 km/h from the W, gusting to 14 mph23 km/h
March 28
7am51°F11°C9 mph14 km/h WPartly Cloudy
8am50°F10°C8 mph13 km/h WPartly Cloudy
9am50°F10°C7 mph12 km/h WPartly Cloudy
10am50°F10°C7 mph12 km/h WPartly Cloudy
11am50°F10°C5 mph9 km/h WPartly Cloudy
12pm51°F11°C5 mph8 km/h WPartly Cloudy
1pm53°F11°C5 mph8 km/h WPartly Cloudy
2pm54°F12°C5 mph8 km/h WPartly Cloudy
3pm56°F14°C6 mph9 km/h WPartly Cloudy
4pm58°F14°C7 mph11 km/h WPartly Cloudy
5pm59°F15°C8 mph12 km/h WMostly Cloudy
6pm59°F15°C10 mph16 km/h WMostly Cloudy
DateLowHighWindDayNight
March 2850°F10°C59°F15°C7 mph12 km/h from WMostly CloudyCloudy
March 2947°F9°C54°F12°C12 mph19 km/h from SERainDrizzle
March 3048°F9°C58°F14°C6 mph10 km/h from ERainMostly Cloudy
March 3145°F7°C61°F16°C6 mph9 km/h from WPartly CloudyPartly Cloudy
April 146°F8°C64°F18°C6 mph9 km/h from WMostly ClearMostly Clear
April 248°F9°C64°F18°C6 mph9 km/h from NWMostly ClearPartly Cloudy
April 350°F10°C64°F18°C9 mph14 km/h from WPartly CloudyMostly Cloudy

Yes

Low of 47°F9°C, High of 55°F13°C
Wind: 12 mph19 km/h
Precipitation: 71% rain

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