Yes

you do need a jacket based on the weather in Mérida, Yucatan, Mexico 1 second ago

Why? Because the rain is just enough to ruin your hairstyle but not your mood!
80°F27°C & Rain

Wind is 4 mph7 km/h from the East, gusting to 10 mph16 km/h
September 11
12am79°F26°C4 mph7 km/h EastThunderstorms
1am78°F26°C5 mph8 km/h EastMostly Cloudy
2am78°F26°C4 mph6 km/h EastThunderstorms
3am77°F25°C3 mph5 km/h EastPartly Cloudy
4am77°F25°C3 mph5 km/h EastPartly Cloudy
5am76°F25°C3 mph5 km/h EastPartly Cloudy
6am76°F24°C3 mph5 km/h EastPartly Cloudy
7am76°F24°C2 mph4 km/h EastPartly Cloudy
8am76°F24°C3 mph4 km/h EastPartly Cloudy
9am78°F26°C4 mph6 km/h EastPartly Cloudy
10am81°F27°C5 mph8 km/h EastMostly Clear
11am85°F29°C5 mph9 km/h EastMostly Clear
DateLowHighWindDayNight
September 1076°F24°C94°F34°C7 mph11 km/h from EastPartly CloudyThunderstorms
September 1176°F24°C92°F34°C7 mph11 km/h from NortheastMostly ClearThunderstorms
September 1274°F24°C91°F33°C5 mph8 km/h from NortheastPartly CloudyThunderstorms
September 1374°F23°C90°F32°C4 mph7 km/h from NortheastThunderstormsThunderstorms
September 1474°F23°C88°F31°C4 mph7 km/h from NortheastThunderstormsThunderstorms
September 1574°F23°C89°F32°C5 mph9 km/h from EastThunderstormsThunderstorms
September 1674°F24°C88°F31°C5 mph8 km/h from EastMostly CloudyThunderstorms

No

Low of 75°F24°C, High of 92°F34°C
Wind: 7 mph11 km/h
Precipitation: 51% rain

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