Yes

you do need a jacket based on the weather in Warsaw, Poland 1 second ago

Why? Because you're not freezing, but you’ll definitely start complaining if it lasts much longer!
40°F5°C & Mostly Clear

Wind is 8 mph13 km/h from the North, gusting to 19 mph30 km/h
May 15
2am42°F5°C9 mph14 km/h NorthMostly Clear
3am45°F7°C9 mph14 km/h NorthPartly Cloudy
4am47°F8°C8 mph13 km/h NorthMostly Cloudy
5am49°F9°C8 mph13 km/h NorthwestMostly Cloudy
6am51°F10°C8 mph13 km/h NorthwestMostly Cloudy
7am52°F11°C9 mph14 km/h NorthwestMostly Cloudy
8am52°F11°C9 mph14 km/h WestMostly Cloudy
9am53°F11°C11 mph17 km/h WestMostly Cloudy
10am52°F11°C9 mph15 km/h WestMostly Cloudy
11am51°F10°C9 mph14 km/h NorthwestMostly Cloudy
12pm50°F10°C8 mph14 km/h NorthwestMostly Cloudy
1pm49°F9°C8 mph13 km/h NorthwestPartly Cloudy
DateLowHighWindDayNight
May 1439°F4°C53°F12°C9 mph14 km/h from NorthwestMostly CloudyRain
May 1541°F5°C52°F11°C11 mph18 km/h from WestRainDrizzle
May 1640°F4°C51°F11°C9 mph14 km/h from WestDrizzleDrizzle
May 1740°F5°C54°F12°C10 mph16 km/h from WestDrizzleMostly Cloudy
May 1842°F6°C54°F12°C9 mph14 km/h from WestDrizzleDrizzle
May 1947°F8°C66°F19°C8 mph13 km/h from NorthwestPartly CloudyMostly Clear
May 2048°F9°C73°F23°C9 mph14 km/h from WestMostly ClearMostly Clear

Yes

Low of 41°F5°C, High of 52°F11°C
Wind: 11 mph18 km/h
Precipitation: 68% rain

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