No
you don't need a jacket based on the weather in 53100 Siena, Province of Siena, Italy 1 second ago
65°F18°C & Clear
Wind is 5 mph8 km/h from the West, gusting to 12 mph20 km/h
| September 2 | ||||
| 5pm | 63°F17°C | 4 mph6 km/h West | Clear | |
| 6pm | 62°F17°C | 3 mph4 km/h West | Clear | |
| 7pm | 61°F16°C | 2 mph4 km/h West | Clear | |
| 8pm | 61°F16°C | 2 mph4 km/h West | Clear | |
| 9pm | 60°F16°C | 2 mph3 km/h West | Mostly Clear | |
| 10pm | 59°F15°C | 1 mph2 km/h West | Mostly Clear | |
| 11pm | 59°F15°C | 1 mph2 km/h West | Partly Cloudy | |
| September 3 | ||||
| 12am | 58°F14°C | 1 mph2 km/h East | Mostly Clear | |
| 1am | 58°F15°C | 2 mph3 km/h East | Partly Cloudy | |
| 2am | 61°F16°C | 2 mph3 km/h East | Partly Cloudy | |
| 3am | 64°F18°C | 2 mph3 km/h Southeast | Partly Cloudy | |
| 4am | 68°F20°C | 2 mph3 km/h Southwest | Mostly Cloudy | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 1 | 62°F17°C | 76°F25°C | 7 mph12 km/h from West | Rain | Mostly Clear |
| September 2 | 58°F14°C | 78°F25°C | 5 mph8 km/h from Northwest | Partly Cloudy | Clear |
| September 3 | 57°F14°C | 82°F28°C | 2 mph3 km/h from Northwest | Mostly Clear | Mostly Clear |
| September 4 | 59°F15°C | 80°F27°C | 5 mph9 km/h from Northwest | Mostly Clear | Mostly Clear |
| September 5 | 55°F13°C | 83°F28°C | 2 mph3 km/h from North | Mostly Clear | Clear |
| September 6 | 59°F15°C | 84°F29°C | 2 mph3 km/h from Northeast | Partly Cloudy | Mostly Cloudy |
| September 7 | 61°F16°C | 84°F29°C | 3 mph5 km/h from South | Partly Cloudy | Clear |
Yes
Low of 58°F15°C, High of 78°F26°CWind: 5 mph8 km/h
Precipitation: None