Yes

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

Why? Because it's cold. simple as that.
49°F9°C & Mostly Cloudy

Wind is 4 mph6 km/h from the SE, gusting to 6 mph10 km/h
March 29
4am47°F9°C4 mph6 km/h SEMostly Cloudy
5am46°F8°C4 mph6 km/h SEMostly Cloudy
6am46°F8°C4 mph6 km/h SECloudy
7am45°F7°C3 mph5 km/h SECloudy
8am45°F7°C3 mph5 km/h SECloudy
9am46°F8°C3 mph6 km/h SECloudy
10am46°F8°C4 mph6 km/h SECloudy
11am47°F9°C4 mph7 km/h SECloudy
12pm50°F10°C5 mph8 km/h SECloudy
1pm52°F11°C7 mph11 km/h SEDrizzle
2pm53°F12°C9 mph14 km/h SEDrizzle
3pm54°F12°C12 mph20 km/h SECloudy
DateLowHighWindDayNight
March 2945°F7°C55°F13°C11 mph18 km/h from SERainRain
March 3046°F8°C60°F15°C4 mph6 km/h from SEDrizzleMostly Cloudy
March 3145°F7°C64°F18°C4 mph6 km/h from WPartly CloudyClear
April 143°F6°C72°F22°C4 mph7 km/h from WClearClear
April 246°F8°C75°F24°C4 mph7 km/h from SClearClear
April 350°F10°C74°F23°C5 mph8 km/h from SMostly ClearPartly Cloudy
April 445°F7°C60°F15°C8 mph13 km/h from WPartly CloudyPartly Cloudy

Yes

Low of 46°F8°C, High of 60°F16°C
Wind: 4 mph6 km/h
Precipitation: 65% rain

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