Yes

you do need a jacket based on the weather in Itanagar 1 second ago

Why? Because a little drizzle out!
86°F30°C & Drizzle

Wind is 6 mph9 km/h from the Southwest, gusting to 16 mph26 km/h
August 21
5am86°F30°C5 mph8 km/h SouthwestThunderstorms
6am85°F30°C4 mph6 km/h SouthwestThunderstorms
7am84°F29°C3 mph5 km/h SouthwestThunderstorms
8am82°F28°C2 mph3 km/h SouthThunderstorms
9am80°F27°C3 mph4 km/h EastRain
10am78°F26°C2 mph3 km/h SoutheastRain
11am78°F25°C2 mph3 km/h NorthRain
12pm77°F25°C2 mph3 km/h NorthRain
1pm77°F25°C1 mph2 km/h NorthRain
2pm76°F25°C1 mph2 km/h SouthwestRain
3pm76°F24°C1 mph2 km/h SouthRain
4pm75°F24°C2 mph3 km/h WestRain
DateLowHighWindDayNight
August 2075°F24°C86°F30°C5 mph8 km/h from SouthwestThunderstormsRain
August 2175°F24°C87°F30°C3 mph4 km/h from SoutheastRainRain
August 2275°F24°C86°F30°C2 mph4 km/h from SoutheastThunderstormsRain
August 2375°F24°C86°F30°C2 mph4 km/h from SoutheastDrizzleRain
August 2475°F24°C83°F28°C3 mph4 km/h from EastRainDrizzle
August 2575°F24°C90°F32°C2 mph4 km/h from SoutheastThunderstormsPartly Cloudy
August 2676°F25°C88°F31°C3 mph4 km/h from SoutheastThunderstormsRain

No

Low of 74°F24°C, High of 87°F31°C
Wind: 3 mph4 km/h
Precipitation: 81% rain

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