Yes

you do need a jacket based on the weather in Dhaka, Bangladesh 1 second ago

Why? Because some drizzle out there!
81°F27°C & Drizzle

Wind is 4 mph6 km/h from the East, gusting to 11 mph17 km/h
June 4
11pm83°F28°C5 mph8 km/h EastRain
June 5
12am85°F30°C5 mph8 km/h EastDrizzle
1am88°F31°C5 mph8 km/h SoutheastMostly Cloudy
2am88°F31°C5 mph8 km/h EastMostly Cloudy
3am89°F32°C5 mph7 km/h SoutheastMostly Cloudy
4am90°F32°C4 mph7 km/h SoutheastMostly Cloudy
5am89°F32°C4 mph7 km/h SoutheastMostly Cloudy
6am88°F31°C4 mph6 km/h SoutheastMostly Cloudy
7am89°F31°C4 mph6 km/h SouthMostly Cloudy
8am87°F31°C4 mph6 km/h SouthMostly Cloudy
9am86°F30°C4 mph6 km/h SouthPartly Cloudy
10am84°F29°C4 mph6 km/h SoutheastMostly Clear
DateLowHighWindDayNight
June 478°F26°C90°F32°C4 mph7 km/h from SoutheastThunderstormsRain
June 579°F26°C92°F33°C3 mph5 km/h from SouthThunderstormsMostly Clear
June 680°F27°C93°F34°C4 mph6 km/h from SouthMostly ClearClear
June 781°F27°C94°F34°C4 mph6 km/h from SouthMostly ClearClear
June 881°F27°C93°F34°C5 mph7 km/h from SouthMostly ClearClear
June 981°F27°C94°F34°C5 mph9 km/h from SouthMostly ClearMostly Clear
June 1080°F27°C92°F34°C4 mph6 km/h from SoutheastPartly CloudyDrizzle

No

Low of 79°F26°C, High of 91°F33°C
Wind: 3 mph5 km/h
Precipitation: 47% rain

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