Yes

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

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

Wind is 7 mph11 km/h from the South, gusting to 12 mph20 km/h
May 25
3am57°F14°C7 mph12 km/h SouthClear
4am60°F16°C8 mph13 km/h SouthClear
5am62°F17°C8 mph13 km/h SouthClear
6am64°F18°C8 mph13 km/h SouthMostly Clear
7am65°F19°C7 mph12 km/h SouthPartly Cloudy
8am66°F19°C7 mph12 km/h SouthMostly Clear
9am67°F20°C7 mph12 km/h SouthPartly Cloudy
10am68°F20°C8 mph12 km/h SouthPartly Cloudy
11am67°F20°C8 mph13 km/h SouthPartly Cloudy
12pm67°F19°C8 mph13 km/h SouthwestMostly Clear
1pm65°F19°C7 mph11 km/h SouthwestPartly Cloudy
2pm62°F17°C6 mph10 km/h SouthwestPartly Cloudy
DateLowHighWindDayNight
May 2440°F5°C68°F20°C7 mph12 km/h from SouthMostly ClearDrizzle
May 2551°F10°C67°F20°C10 mph17 km/h from NorthwestDrizzleClear
May 2645°F7°C70°F21°C6 mph9 km/h from WestPartly CloudyMostly Clear
May 2751°F10°C68°F20°C10 mph17 km/h from SouthwestDrizzleDrizzle
May 2851°F11°C64°F18°C14 mph22 km/h from WestRainRain
May 2947°F8°C63°F17°C12 mph20 km/h from WestRainMostly Cloudy
May 3053°F12°C66°F19°C14 mph23 km/h from NorthwestPartly CloudyMostly Clear

Yes

Low of 51°F11°C, High of 67°F20°C
Wind: 10 mph17 km/h
Precipitation: 57% rain

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