Yes

you do need a jacket based on the weather in Amsterdam, Netherlands 21 seconds ago

Why? Because it's so windy, your hat has officially retired from your head!
65°F18°C & Cloudy

Wind is 13 mph21 km/h from the Southwest, gusting to 25 mph40 km/h
September 18
4am65°F18°C13 mph21 km/h SouthwestCloudy
5am65°F18°C14 mph22 km/h SouthwestDrizzle
6am66°F19°C13 mph22 km/h SouthwestDrizzle
7am67°F19°C14 mph22 km/h SouthwestCloudy
8am67°F20°C14 mph23 km/h SouthwestCloudy
9am68°F20°C15 mph24 km/h SouthwestCloudy
10am68°F20°C15 mph24 km/h SouthwestCloudy
11am69°F20°C14 mph23 km/h SouthwestMostly Cloudy
12pm68°F20°C13 mph22 km/h SouthwestMostly Cloudy
1pm67°F20°C13 mph21 km/h SouthwestMostly Cloudy
2pm66°F19°C13 mph20 km/h SouthwestMostly Cloudy
3pm65°F18°C12 mph19 km/h SouthwestPartly Cloudy
DateLowHighWindDayNight
September 1763°F17°C69°F20°C13 mph21 km/h from SouthwestDrizzlePartly Cloudy
September 1861°F16°C78°F25°C8 mph12 km/h from SouthPartly CloudyPartly Cloudy
September 1961°F16°C77°F25°C9 mph14 km/h from SouthThunderstormsRain
September 2056°F13°C64°F18°C13 mph21 km/h from SouthwestCloudyDrizzle
September 2152°F11°C61°F16°C8 mph13 km/h from WestDrizzlePartly Cloudy
September 2248°F9°C59°F15°C7 mph12 km/h from NorthPartly CloudyPartly Cloudy
September 2346°F8°C60°F16°C7 mph12 km/h from NortheastPartly CloudyPartly Cloudy

No

Low of 61°F16°C, High of 78°F26°C
Wind: 8 mph12 km/h
Precipitation: None

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