No

you don't need a jacket based on the weather in San Miguel de Allende, Guanajuato, Mexico 1 second ago

60°F15°C & Partly Cloudy

Wind is 3 mph5 km/h from the Northeast, gusting to 7 mph11 km/h
September 18
1am60°F15°C4 mph6 km/h NortheastPartly Cloudy
2am58°F15°C4 mph6 km/h NortheastPartly Cloudy
3am57°F14°C3 mph5 km/h NortheastMostly Cloudy
4am56°F13°C3 mph5 km/h NortheastMostly Cloudy
5am55°F13°C3 mph5 km/h NortheastPartly Cloudy
6am55°F13°C4 mph6 km/h NortheastPartly Cloudy
7am54°F12°C4 mph6 km/h NortheastPartly Cloudy
8am55°F13°C4 mph6 km/h NortheastMostly Cloudy
9am56°F13°C4 mph6 km/h NortheastMostly Cloudy
10am58°F15°C4 mph7 km/h NortheastPartly Cloudy
11am63°F17°C5 mph8 km/h NortheastPartly Cloudy
12pm67°F19°C6 mph9 km/h EastMostly Cloudy
DateLowHighWindDayNight
September 1757°F14°C75°F24°C4 mph7 km/h from NortheastMostly CloudyPartly Cloudy
September 1854°F12°C78°F26°C6 mph10 km/h from NortheastMostly CloudyMostly Cloudy
September 1956°F14°C79°F26°C7 mph12 km/h from NortheastPartly CloudyMostly Cloudy
September 2057°F14°C79°F26°C7 mph12 km/h from NortheastPartly CloudyPartly Cloudy
September 2156°F13°C80°F27°C6 mph10 km/h from NortheastPartly CloudyMostly Clear
September 2255°F13°C80°F27°C6 mph10 km/h from NortheastMostly ClearMostly Clear
September 2353°F12°C78°F26°C8 mph12 km/h from NortheastMostly ClearPartly Cloudy

Yes

Low of 55°F13°C, High of 78°F26°C
Wind: 6 mph10 km/h
Precipitation: 25% rain

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