Yes

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

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
53°F12°C & Cloudy

Wind is 9 mph14 km/h from the South, gusting to 19 mph30 km/h
March 31
6am53°F12°C9 mph15 km/h SouthDrizzle
7am53°F11°C10 mph17 km/h SouthDrizzle
8am52°F11°C11 mph17 km/h SouthwestRain
9am51°F11°C9 mph14 km/h SouthwestDrizzle
10am51°F10°C9 mph14 km/h SouthwestDrizzle
11am51°F10°C7 mph11 km/h SouthCloudy
12pm52°F11°C9 mph14 km/h SouthCloudy
1pm53°F12°C9 mph15 km/h SouthwestCloudy
2pm54°F12°C10 mph16 km/h SouthwestMostly Cloudy
3pm56°F13°C10 mph17 km/h SouthwestMostly Cloudy
4pm57°F14°C12 mph19 km/h SouthwestCloudy
5pm58°F14°C12 mph19 km/h SouthwestCloudy
DateLowHighWindDayNight
March 3145°F7°C58°F14°C11 mph17 km/h from SouthwestRainRain
April 144°F6°C56°F13°C12 mph19 km/h from SouthRainDrizzle
April 241°F5°C62°F17°C5 mph7 km/h from NorthwestMostly ClearPartly Cloudy
April 342°F6°C64°F18°C4 mph6 km/h from NorthwestMostly ClearClear
April 445°F7°C72°F22°C5 mph8 km/h from NorthwestClearClear
April 547°F8°C75°F24°C5 mph8 km/h from NorthwestClearMostly Clear
April 650°F10°C76°F24°C4 mph6 km/h from SouthwestMostly ClearMostly Cloudy

Yes

Low of 44°F7°C, High of 55°F13°C
Wind: 12 mph19 km/h
Precipitation: 85% rain

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