Yes

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

Why? Because the cold's there, but it's just a reminder, not an invasion!
39°F4°C & Clear

Wind is 5 mph8 km/h from the North, gusting to 10 mph16 km/h
October 27
1pm43°F6°C6 mph10 km/h NortheastMostly Clear
2pm48°F9°C7 mph11 km/h NortheastMostly Clear
3pm53°F12°C7 mph11 km/h NortheastClear
4pm57°F14°C7 mph11 km/h NortheastClear
5pm59°F15°C6 mph10 km/h EastMostly Clear
6pm60°F15°C6 mph10 km/h EastClear
7pm60°F16°C6 mph10 km/h EastMostly Clear
8pm60°F15°C7 mph11 km/h EastMostly Clear
9pm58°F15°C7 mph11 km/h EastMostly Clear
10pm54°F12°C5 mph9 km/h EastMostly Clear
11pm50°F10°C4 mph7 km/h EastMostly Clear
October 28
12am48°F9°C5 mph7 km/h NortheastMostly Clear
DateLowHighWindDayNight
October 2737°F3°C60°F16°C6 mph10 km/h from NortheastMostly ClearPartly Cloudy
October 2839°F4°C57°F14°C10 mph16 km/h from NortheastMostly CloudyMostly Cloudy
October 2942°F6°C56°F13°C9 mph15 km/h from NortheastRainRain
October 3050°F10°C66°F19°C11 mph18 km/h from SoutheastThunderstormsPartly Cloudy
October 3146°F8°C56°F13°C15 mph24 km/h from WestWindyMostly Clear
November 142°F6°C58°F14°C8 mph13 km/h from WestPartly CloudyMostly Cloudy
November 242°F6°C56°F14°C5 mph8 km/h from WestPartly CloudyMostly Clear

Yes

Low of 39°F4°C, High of 57°F14°C
Wind: 10 mph16 km/h
Precipitation: None

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