Yes

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

Why? Because the drizzle is not enough rain to call it "raining," but enough to make you a little soggy and it's pretty chilly and there are strong winds blowing out there!
55°F13°C & Drizzle

Wind is 12 mph19 km/h from the South, gusting to 29 mph46 km/h
March 17
1am54°F12°C11 mph17 km/h SouthRain
2am54°F12°C10 mph17 km/h SouthRain
3am53°F12°C10 mph16 km/h SouthwestRain
4am52°F11°C9 mph14 km/h SouthwestRain
5am51°F11°C7 mph11 km/h SouthwestDrizzle
6am51°F11°C7 mph11 km/h SouthwestDrizzle
7am50°F10°C7 mph11 km/h SouthwestCloudy
8am50°F10°C7 mph11 km/h SouthwestMostly Cloudy
9am49°F9°C7 mph12 km/h SouthwestPartly Cloudy
10am49°F9°C7 mph12 km/h SouthwestMostly Clear
11am48°F9°C8 mph12 km/h SouthwestMostly Clear
12pm50°F10°C10 mph16 km/h SouthwestPartly Cloudy
DateLowHighWindDayNight
March 1644°F7°C63°F17°C8 mph12 km/h from SouthCloudyRain
March 1745°F7°C55°F13°C14 mph22 km/h from WestDrizzleClear
March 1839°F4°C59°F15°C3 mph5 km/h from WestMostly ClearPartly Cloudy
March 1940°F5°C58°F14°C5 mph8 km/h from SouthwestCloudyRain
March 2046°F8°C61°F16°C5 mph8 km/h from WestMostly CloudyPartly Cloudy
March 2144°F7°C60°F16°C5 mph9 km/h from WestMostly CloudyCloudy
March 2246°F8°C67°F20°C5 mph8 km/h from WestMostly CloudyPartly Cloudy

Yes

Low of 45°F7°C, High of 55°F13°C
Wind: 14 mph22 km/h
Precipitation: 53% rain

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