Yes

you do need a jacket based on the weather in Ho Chi Minh City, Vietnam 1 second ago

Why? Because a little drizzle out!
77°F25°C & Drizzle

Wind is 6 mph10 km/h from the West, gusting to 17 mph28 km/h
September 18
8pm77°F25°C6 mph10 km/h WestDrizzle
9pm79°F26°C8 mph13 km/h WestDrizzle
10pm81°F27°C8 mph13 km/h WestDrizzle
11pm83°F28°C9 mph14 km/h WestCloudy
September 19
12am85°F30°C9 mph14 km/h WestCloudy
1am87°F30°C10 mph16 km/h WestCloudy
2am87°F30°C9 mph15 km/h WestCloudy
3am87°F30°C9 mph14 km/h WestCloudy
4am86°F30°C9 mph14 km/h WestCloudy
5am85°F29°C8 mph13 km/h WestCloudy
6am83°F29°C7 mph11 km/h WestCloudy
7am82°F28°C6 mph9 km/h WestCloudy
DateLowHighWindDayNight
September 1876°F25°C87°F30°C8 mph13 km/h from WestRainDrizzle
September 1975°F24°C89°F31°C7 mph12 km/h from WestThunderstormsThunderstorms
September 2076°F25°C89°F32°C7 mph12 km/h from WestThunderstormsThunderstorms
September 2177°F25°C87°F31°C7 mph11 km/h from WestThunderstormsDrizzle
September 2276°F25°C85°F29°C7 mph11 km/h from WestRainDrizzle
September 2376°F25°C86°F30°C9 mph15 km/h from WestRainDrizzle
September 2476°F25°C86°F30°C8 mph13 km/h from WestThunderstormsCloudy

No

Low of 75°F24°C, High of 89°F32°C
Wind: 7 mph12 km/h
Precipitation: 42% rain

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