Yes

you do need a jacket based on the weather in Guangzhou, Guangdong, China 1 second ago

Why? Because the drizzle is not enough rain to call it "raining," but enough to make you a little soggy!
79°F26°C & Drizzle

Wind is 3 mph5 km/h from the Southwest, gusting to 7 mph11 km/h
July 9
6pm79°F26°C4 mph6 km/h SouthwestThunderstorms
7pm79°F26°C4 mph6 km/h WestThunderstorms
8pm80°F27°C5 mph8 km/h WestCloudy
9pm83°F28°C5 mph8 km/h WestCloudy
10pm84°F29°C5 mph9 km/h WestCloudy
11pm86°F30°C5 mph9 km/h NorthwestRain
July 10
12am87°F30°C7 mph11 km/h NorthwestDrizzle
1am87°F31°C6 mph10 km/h NorthwestRain
2am87°F30°C6 mph10 km/h NorthwestThunderstorms
3am86°F30°C6 mph10 km/h NorthRain
4am84°F29°C6 mph9 km/h NorthRain
5am82°F28°C6 mph9 km/h NorthRain
DateLowHighWindDayNight
July 979°F26°C87°F31°C6 mph9 km/h from NorthwestThunderstormsRain
July 1079°F26°C84°F29°C7 mph11 km/h from NortheastRainDrizzle
July 1179°F26°C87°F30°C5 mph8 km/h from SoutheastRainRain
July 1281°F27°C94°F35°C4 mph7 km/h from SouthDrizzleDrizzle
July 1384°F29°C96°F35°C4 mph6 km/h from SouthwestRainMostly Cloudy
July 1483°F28°C97°F36°C5 mph7 km/h from SouthwestRainPartly Cloudy
July 1585°F29°C98°F37°C4 mph6 km/h from SouthwestDrizzlePartly Cloudy

No

Low of 79°F26°C, High of 84°F29°C
Wind: 7 mph11 km/h
Precipitation: 82% rain

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