Yes

you do need a jacket based on the weather in Sydney NSW, Australia 15 seconds ago

Why? Because there's a thunderstorm or two nearby!
69°F21°C & Isolated Thunderstorms

Wind is 8 mph13 km/h from the Northeast, gusting to 16 mph26 km/h
October 31
8am69°F21°C8 mph13 km/h NortheastThunderstorms
9am68°F20°C10 mph16 km/h NortheastCloudy
10am67°F19°C9 mph14 km/h NortheastCloudy
11am66°F19°C8 mph13 km/h NortheastCloudy
12pm66°F19°C7 mph12 km/h NortheastCloudy
1pm66°F19°C6 mph10 km/h NortheastMostly Cloudy
2pm66°F19°C6 mph10 km/h NortheastCloudy
3pm65°F18°C4 mph7 km/h NorthCloudy
4pm64°F18°C3 mph6 km/h NorthwestCloudy
5pm63°F17°C4 mph6 km/h NorthwestThunderstorms
6pm63°F17°C2 mph4 km/h WestRain
7pm63°F17°C2 mph4 km/h NorthwestThunderstorms
DateLowHighWindDayNight
October 3059°F15°C74°F23°C7 mph11 km/h from NortheastThunderstormsThunderstorms
October 3163°F17°C75°F24°C5 mph8 km/h from SoutheastThunderstormsPartly Cloudy
November 163°F17°C75°F24°C7 mph11 km/h from EastPartly CloudyPartly Cloudy
November 263°F17°C79°F26°C10 mph16 km/h from NortheastMostly CloudyDrizzle
November 357°F14°C73°F23°C13 mph20 km/h from NorthwestDrizzleClear
November 453°F12°C75°F24°C9 mph15 km/h from NorthwestMostly ClearMostly Clear
November 556°F13°C75°F24°C7 mph11 km/h from NortheastMostly ClearMostly Cloudy

No

Low of 63°F17°C, High of 75°F24°C
Wind: 5 mph8 km/h
Precipitation: 66% rain

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