Yes

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

Why? Because it's cool. Pleasantly cool, but cool!
56°F13°C & Mostly Cloudy

Wind is 2 mph3 km/h from the West, gusting to 4 mph7 km/h
October 22
4am55°F13°C3 mph5 km/h WestMostly Cloudy
5am54°F12°C5 mph8 km/h WestMostly Cloudy
6am53°F12°C4 mph7 km/h WestPartly Cloudy
7am52°F11°C4 mph7 km/h SouthwestPartly Cloudy
8am51°F11°C5 mph9 km/h WestMostly Clear
9am50°F10°C6 mph10 km/h WestMostly Clear
10am49°F9°C7 mph11 km/h WestClear
11am48°F9°C6 mph10 km/h WestClear
12pm48°F9°C6 mph9 km/h WestClear
1pm51°F10°C7 mph11 km/h WestClear
2pm54°F12°C9 mph15 km/h WestClear
3pm56°F13°C12 mph20 km/h WestMostly Clear
DateLowHighWindDayNight
October 2139°F4°C71°F22°C3 mph4 km/h from SouthClearDrizzle
October 2246°F8°C59°F15°C10 mph17 km/h from WestPartly CloudyMostly Clear
October 2342°F6°C57°F14°C10 mph17 km/h from WestMostly ClearClear
October 2439°F4°C57°F14°C8 mph13 km/h from NorthwestMostly ClearMostly Clear
October 2538°F3°C58°F14°C5 mph8 km/h from NorthwestPartly CloudyPartly Cloudy
October 2640°F4°C58°F14°C2 mph4 km/h from SoutheastPartly CloudyMostly Cloudy
October 2743°F6°C59°F15°C5 mph8 km/h from EastPartly CloudyPartly Cloudy

Yes

Low of 46°F8°C, High of 59°F15°C
Wind: 10 mph17 km/h
Precipitation: None

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