Yes

you do need a jacket based on the weather in Bellingham, WA, USA 1 second ago

Why? Because it's pretty chilly!
57°F14°C & Clear

Wind is 4 mph6 km/h from the Southeast, gusting to 6 mph9 km/h
September 18
5am57°F14°C4 mph7 km/h SoutheastClear
6am56°F14°C4 mph6 km/h SouthMostly Clear
7am56°F13°C4 mph6 km/h SouthMostly Clear
8am55°F13°C4 mph6 km/h SouthMostly Cloudy
9am55°F13°C4 mph6 km/h SouthMostly Cloudy
10am55°F13°C3 mph5 km/h SouthPartly Cloudy
11am57°F14°C3 mph5 km/h SouthPartly Cloudy
12pm59°F15°C2 mph3 km/h WestPartly Cloudy
1pm60°F16°C3 mph5 km/h WestMostly Cloudy
2pm62°F17°C3 mph6 km/h WestPartly Cloudy
3pm64°F18°C5 mph8 km/h WestPartly Cloudy
4pm66°F19°C6 mph9 km/h WestPartly Cloudy
DateLowHighWindDayNight
September 1855°F13°C68°F20°C4 mph7 km/h from WestMostly ClearClear
September 1953°F12°C69°F21°C3 mph5 km/h from WestMostly ClearPartly Cloudy
September 2054°F12°C67°F20°C7 mph11 km/h from SouthDrizzleRain
September 2156°F13°C66°F19°C7 mph11 km/h from SouthDrizzlePartly Cloudy
September 2253°F12°C67°F20°C3 mph5 km/h from WestPartly CloudyPartly Cloudy
September 2353°F12°C69°F21°C5 mph8 km/h from NorthwestMostly ClearPartly Cloudy
September 2456°F13°C68°F20°C4 mph7 km/h from SouthwestPartly CloudyMostly Cloudy

Yes

Low of 53°F12°C, High of 70°F21°C
Wind: 3 mph5 km/h
Precipitation: None

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