Yes

you do need a jacket based on the weather in Rockville, MD 20853, USA 1 second ago

Why? Because it's quite chilly.
45°F7°C & Cloudy

Wind is 4 mph7 km/h from the NW, gusting to 12 mph19 km/h
March 28
8am46°F8°C5 mph9 km/h NWCloudy
9am46°F8°C8 mph13 km/h NWCloudy
10am46°F8°C10 mph16 km/h NWCloudy
11am46°F8°C11 mph17 km/h NWCloudy
12pm47°F8°C10 mph17 km/h NWCloudy
1pm48°F9°C10 mph17 km/h NWDrizzle
2pm50°F10°C9 mph15 km/h NWCloudy
3pm51°F11°C9 mph15 km/h NWCloudy
4pm51°F11°C9 mph15 km/h NWCloudy
5pm52°F11°C8 mph13 km/h NWCloudy
6pm51°F10°C8 mph13 km/h NWCloudy
7pm49°F9°C7 mph11 km/h NWCloudy
DateLowHighWindDayNight
March 2842°F6°C52°F11°C9 mph14 km/h from NWDrizzleMostly Clear
March 2935°F2°C59°F15°C12 mph20 km/h from NWMostly ClearMostly Clear
March 3037°F3°C60°F16°C6 mph10 km/h from SWMostly CloudyPartly Cloudy
March 3149°F9°C65°F18°C7 mph11 km/h from NWMostly CloudyRain
April 144°F6°C50°F10°C8 mph13 km/h from ERainRain
April 245°F7°C64°F18°C6 mph9 km/h from SRainRain
April 344°F7°C59°F15°C13 mph21 km/h from NWPartly CloudyMostly Clear

Yes

Low of 35°F2°C, High of 59°F15°C
Wind: 12 mph20 km/h
Precipitation: None

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