Yes

you do need a jacket based on the weather in Colombo, Sri Lanka 1 second ago

Why? Because it's so windy, your hat is now someone else's problem, two cities away!
78°F25°C & Cloudy

Wind is 14 mph23 km/h from the North, gusting to 25 mph41 km/h
November 27
1pm78°F25°C14 mph23 km/h NorthCloudy
2pm77°F25°C14 mph22 km/h NorthDrizzle
3pm77°F25°C13 mph21 km/h NorthwestDrizzle
4pm76°F25°C13 mph20 km/h NorthwestDrizzle
5pm76°F24°C12 mph20 km/h NorthwestDrizzle
6pm75°F24°C12 mph19 km/h NorthDrizzle
7pm75°F24°C12 mph19 km/h NorthDrizzle
8pm75°F24°C12 mph19 km/h NorthRain
9pm77°F25°C11 mph18 km/h NorthRain
10pm78°F26°C11 mph18 km/h NorthCloudy
11pm81°F27°C12 mph19 km/h NorthCloudy
November 28
12am83°F29°C12 mph19 km/h NorthCloudy
DateLowHighWindDayNight
November 2675°F24°C83°F28°C16 mph25 km/h from NorthwestRainRain
November 2775°F24°C86°F30°C12 mph19 km/h from NorthRainRain
November 2875°F24°C85°F29°C8 mph12 km/h from WestRainRain
November 2976°F25°C87°F30°C9 mph15 km/h from SouthwestDrizzleDrizzle
November 3077°F25°C88°F31°C9 mph14 km/h from SouthwestPartly CloudyPartly Cloudy
December 176°F24°C87°F30°C7 mph12 km/h from SouthwestPartly CloudyPartly Cloudy
December 275°F24°C87°F31°C5 mph9 km/h from WestRainDrizzle

No

Low of 74°F24°C, High of 86°F30°C
Wind: 12 mph19 km/h
Precipitation: 73% rain

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