Yes

you do need a jacket based on the weather in Haarlem, Netherlands 1 second ago

Why? Because the wind makes walking forward feel like moonwalking in reverse!
67°F19°C & Windy

Wind is 16 mph26 km/h from the Southwest, gusting to 29 mph47 km/h
July 5
7am67°F19°C16 mph26 km/h SouthwestWindy
8am68°F20°C16 mph26 km/h SouthwestWindy
9am68°F20°C16 mph26 km/h SouthwestWindy
10am69°F20°C16 mph26 km/h SouthwestWindy
11am69°F20°C17 mph27 km/h SouthwestWindy
12pm68°F20°C17 mph27 km/h SouthwestWindy
1pm68°F20°C16 mph27 km/h SouthwestWindy
2pm67°F20°C17 mph27 km/h SouthwestWindy
3pm67°F19°C16 mph25 km/h SouthwestWindy
4pm66°F19°C16 mph26 km/h SouthwestWindy
5pm65°F18°C17 mph27 km/h SouthwestWindy
6pm65°F18°C16 mph26 km/h SouthwestWindy
DateLowHighWindDayNight
July 464°F18°C69°F20°C15 mph24 km/h from SouthwestWindyDrizzle
July 561°F16°C69°F21°C10 mph15 km/h from SouthwestRainRain
July 657°F14°C65°F18°C15 mph24 km/h from NorthwestDrizzlePartly Cloudy
July 755°F13°C65°F18°C13 mph21 km/h from NorthwestDrizzlePartly Cloudy
July 857°F14°C70°F21°C9 mph14 km/h from NorthwestPartly CloudyMostly Clear
July 959°F15°C75°F24°C7 mph11 km/h from WestMostly ClearClear
July 1061°F16°C76°F24°C6 mph9 km/h from NorthPartly CloudyPartly Cloudy

No

Low of 61°F16°C, High of 69°F21°C
Wind: 10 mph15 km/h
Precipitation: 67% rain

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