Yes

you do need a jacket based on the weather in Caxias do Sul, RS, Brazil 9 minutes ago

Why? Because it's so windy, your hat will probably launch into orbit!
61°F16°C & Cloudy

Wind is 9 mph14 km/h from the North, gusting to 27 mph43 km/h
September 2
4am60°F16°C9 mph15 km/h NortheastCloudy
5am61°F16°C10 mph16 km/h NortheastCloudy
6am61°F16°C10 mph16 km/h NortheastCloudy
7am62°F17°C10 mph17 km/h NortheastMostly Cloudy
8am64°F18°C10 mph17 km/h NorthMostly Cloudy
9am68°F20°C10 mph17 km/h NorthMostly Cloudy
10am71°F21°C10 mph17 km/h NorthMostly Cloudy
11am72°F22°C10 mph17 km/h NorthMostly Cloudy
12pm74°F23°C10 mph16 km/h NorthMostly Cloudy
1pm75°F24°C10 mph16 km/h NorthMostly Cloudy
2pm75°F24°C9 mph14 km/h NorthMostly Cloudy
3pm74°F23°C8 mph13 km/h NorthMostly Cloudy
DateLowHighWindDayNight
September 160°F16°C75°F24°C9 mph15 km/h from NorthMostly CloudyMostly Cloudy
September 262°F17°C78°F26°C8 mph13 km/h from NorthMostly CloudyDrizzle
September 347°F8°C68°F20°C6 mph9 km/h from SouthRainRain
September 442°F5°C49°F9°C8 mph13 km/h from SoutheastDrizzleMostly Cloudy
September 540°F5°C58°F15°C6 mph9 km/h from SoutheastMostly CloudyPartly Cloudy
September 647°F8°C66°F19°C4 mph7 km/h from NortheastMostly CloudyRain
September 756°F13°C71°F22°C8 mph12 km/h from NorthRainThunderstorms

No

Low of 63°F17°C, High of 78°F26°C
Wind: 8 mph13 km/h
Precipitation: 16% rain

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