No

you don't need a jacket based on the weather in 53100 Siena, Province of Siena, Italy 1 second ago

66°F19°C & Mostly Clear

Wind is 1 mph1 km/h from the East, gusting to 4 mph6 km/h
August 23
3am69°F20°C1 mph2 km/h SoutheastClear
4am72°F22°C2 mph3 km/h SoutheastClear
5am75°F24°C2 mph3 km/h SouthMostly Clear
6am77°F25°C2 mph3 km/h SouthwestMostly Clear
7am79°F26°C2 mph3 km/h WestMostly Clear
8am80°F27°C4 mph6 km/h WestPartly Cloudy
9am80°F27°C5 mph7 km/h WestPartly Cloudy
10am79°F26°C5 mph8 km/h WestMostly Cloudy
11am78°F26°C6 mph9 km/h WestMostly Clear
12pm77°F25°C6 mph9 km/h NorthwestMostly Clear
1pm75°F24°C4 mph7 km/h NorthwestMostly Clear
2pm73°F23°C3 mph5 km/h NorthwestMostly Clear
DateLowHighWindDayNight
August 2262°F17°C80°F27°C3 mph5 km/h from WestMostly ClearMostly Clear
August 2363°F17°C80°F27°C3 mph5 km/h from NorthPartly CloudyMostly Clear
August 2461°F16°C80°F27°C4 mph7 km/h from WestPartly CloudyPartly Cloudy
August 2562°F17°C81°F27°C2 mph4 km/h from WestMostly ClearMostly Clear
August 2662°F17°C84°F29°C5 mph8 km/h from SouthMostly ClearPartly Cloudy
August 2766°F19°C81°F27°C10 mph16 km/h from SouthMostly CloudyThunderstorms
August 2864°F18°C75°F24°C6 mph10 km/h from SouthwestThunderstormsThunderstorms

No

Low of 63°F17°C, High of 80°F27°C
Wind: 3 mph5 km/h
Precipitation: 22% rain

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