Yes

you do need a jacket based on the weather in 21000, Split, Croatia 1 second ago

Why? Because light rain: when the sky can't decide if it’s serious or just messing with you!
69°F21°C & Drizzle

Wind is 2 mph3 km/h from the Northeast, gusting to 4 mph7 km/h
September 11
12am69°F21°C2 mph3 km/h NortheastDrizzle
1am69°F21°C2 mph4 km/h NortheastDrizzle
2am70°F21°C2 mph4 km/h EastMostly Cloudy
3am72°F22°C2 mph3 km/h EastMostly Cloudy
4am74°F23°C3 mph5 km/h WestPartly Cloudy
5am76°F24°C4 mph6 km/h WestMostly Clear
6am77°F25°C6 mph9 km/h WestMostly Clear
7am79°F26°C7 mph11 km/h WestMostly Clear
8am79°F26°C7 mph12 km/h WestClear
9am79°F26°C8 mph13 km/h WestClear
10am78°F26°C8 mph13 km/h WestClear
11am78°F25°C7 mph12 km/h WestClear
DateLowHighWindDayNight
September 1066°F19°C79°F26°C5 mph9 km/h from WestDrizzleClear
September 1164°F18°C79°F26°C5 mph7 km/h from WestClearClear
September 1265°F18°C80°F27°C4 mph6 km/h from SouthwestClearPartly Cloudy
September 1365°F18°C76°F25°C4 mph7 km/h from NorthwestDrizzleMostly Clear
September 1462°F16°C79°F26°C5 mph8 km/h from WestClearClear
September 1563°F17°C79°F26°C4 mph7 km/h from SouthMostly ClearMostly Clear
September 1665°F18°C78°F26°C6 mph10 km/h from SoutheastPartly CloudyMostly Clear

No

Low of 64°F18°C, High of 79°F26°C
Wind: 5 mph7 km/h
Precipitation: None

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