Yes

you do need a jacket based on the weather in Norwalk, CT, USA 1 second ago

Why? Because it's cool. Pleasantly cool, but cool!
52°F11°C & Cloudy

Wind is 4 mph7 km/h from the Southwest, gusting to 10 mph16 km/h
May 23
12pm53°F11°C5 mph8 km/h SouthwestCloudy
1pm53°F12°C6 mph9 km/h SouthwestCloudy
2pm54°F12°C5 mph8 km/h SouthwestDrizzle
3pm55°F13°C6 mph10 km/h WestDrizzle
4pm57°F14°C9 mph14 km/h WestMostly Cloudy
5pm58°F14°C9 mph15 km/h NorthwestMostly Cloudy
6pm58°F14°C8 mph13 km/h NorthwestPartly Cloudy
7pm58°F14°C6 mph10 km/h NorthwestMostly Clear
8pm55°F13°C4 mph7 km/h NorthwestPartly Cloudy
9pm54°F12°C3 mph6 km/h WestPartly Cloudy
10pm52°F11°C4 mph7 km/h WestMostly Cloudy
11pm51°F11°C5 mph8 km/h WestPartly Cloudy
DateLowHighWindDayNight
May 2345°F7°C58°F14°C5 mph8 km/h from WestDrizzleDrizzle
May 2448°F9°C61°F16°C12 mph20 km/h from WestMostly CloudyMostly Clear
May 2549°F9°C64°F18°C10 mph15 km/h from NorthwestPartly CloudyMostly Clear
May 2649°F9°C69°F21°C6 mph9 km/h from NorthMostly ClearMostly Clear
May 2752°F11°C71°F21°C4 mph7 km/h from SouthwestMostly CloudyCloudy
May 2855°F13°C66°F19°C8 mph13 km/h from EastCloudyDrizzle
May 2956°F13°C69°F21°C5 mph8 km/h from SouthMostly CloudyMostly Cloudy

Yes

Low of 47°F9°C, High of 61°F16°C
Wind: 12 mph20 km/h
Precipitation: 11% rain

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