Yes

you do need a jacket based on the weather in Pelotas - Princesa, Pelotas - RS, Brazil 1 second ago

Why? Because it's pretty chilly.
58°F14°C & Clear

Wind is 4 mph6 km/h from the N, gusting to 7 mph11 km/h
April 20
6am58°F14°C4 mph6 km/h NClear
7am61°F16°C4 mph6 km/h NClear
8am67°F19°C3 mph5 km/h NClear
9am72°F22°C4 mph6 km/h NEClear
10am76°F24°C5 mph8 km/h NEClear
11am79°F26°C5 mph7 km/h NEClear
12pm81°F27°C4 mph7 km/h NEClear
1pm82°F28°C5 mph7 km/h NEClear
2pm81°F27°C6 mph9 km/h EClear
3pm80°F27°C7 mph11 km/h EClear
4pm77°F25°C8 mph12 km/h EClear
5pm73°F23°C6 mph10 km/h EClear
DateLowHighWindDayNight
April 1957°F14°C82°F28°C5 mph8 km/h from NEClearMostly Clear
April 2056°F14°C82°F28°C3 mph5 km/h from SMostly CloudyCloudy
April 2163°F17°C73°F23°C6 mph10 km/h from NECloudyMostly Cloudy
April 2262°F17°C80°F27°C5 mph8 km/h from SWPartly CloudyMostly Cloudy
April 2358°F14°C74°F23°C8 mph13 km/h from SMostly ClearMostly Clear
April 2454°F12°C75°F24°C10 mph16 km/h from EPartly CloudyRain
April 2564°F18°C78°F26°C7 mph11 km/h from NRainDrizzle

Yes

Low of 56°F14°C, High of 82°F28°C
Wind: 3 mph5 km/h
Precipitation: None

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