Yes

you do need a jacket based on the weather in Mount Colah NSW 2079, Australia 1 second ago

Why? Because it's windy enough to give you a brand new hairdo!
75°F24°C & Partly Cloudy

Wind is 7 mph12 km/h from the North, gusting to 19 mph31 km/h
October 19
1am76°F24°C7 mph12 km/h NorthPartly Cloudy
2am78°F26°C7 mph12 km/h NortheastPartly Cloudy
3am80°F26°C8 mph13 km/h NortheastMostly Clear
4am80°F27°C9 mph14 km/h NortheastClear
5am79°F26°C10 mph17 km/h NortheastMostly Clear
6am77°F25°C11 mph17 km/h NortheastMostly Clear
7am74°F24°C10 mph16 km/h NortheastClear
8am71°F22°C9 mph15 km/h NortheastClear
9am68°F20°C8 mph13 km/h NortheastClear
10am67°F19°C7 mph11 km/h NortheastMostly Clear
11am66°F19°C6 mph9 km/h NortheastClear
12pm65°F18°C4 mph7 km/h NortheastMostly Clear
DateLowHighWindDayNight
October 1856°F13°C80°F27°C7 mph11 km/h from NortheastMostly ClearPartly Cloudy
October 1960°F16°C95°F35°C6 mph9 km/h from NorthwestMostly ClearPartly Cloudy
October 2064°F18°C76°F25°C8 mph13 km/h from SoutheastPartly CloudyPartly Cloudy
October 2163°F17°C96°F36°C13 mph21 km/h from NorthwestMostly CloudyMostly Cloudy
October 2258°F14°C75°F24°C10 mph15 km/h from SoutheastMostly ClearMostly Cloudy
October 2356°F13°C75°F24°C6 mph10 km/h from NortheastPartly CloudyMostly Cloudy
October 2457°F14°C74°F23°C6 mph10 km/h from SouthMostly CloudyMostly Cloudy

No

Low of 60°F16°C, High of 95°F35°C
Wind: 6 mph9 km/h
Precipitation: 26% clear

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