Yes

you do need a jacket based on the weather in Maple Valley, WA 98038, USA 1 second ago

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

Wind is 6 mph10 km/h from the E, gusting to 17 mph28 km/h
April 20
2am51°F11°C7 mph11 km/h EClear
3am51°F10°C7 mph12 km/h EClear
4am50°F10°C8 mph12 km/h EClear
5am49°F9°C8 mph13 km/h EClear
6am49°F9°C10 mph16 km/h EClear
7am48°F9°C11 mph17 km/h EClear
8am47°F9°C10 mph16 km/h EClear
9am47°F8°C10 mph17 km/h EMostly Clear
10am48°F9°C11 mph17 km/h EMostly Clear
11am52°F11°C11 mph18 km/h EClear
12pm56°F13°C11 mph18 km/h EClear
1pm60°F16°C11 mph18 km/h SEMostly Clear
DateLowHighWindDayNight
April 1943°F6°C67°F20°C6 mph10 km/h from EClearClear
April 2044°F7°C72°F22°C10 mph16 km/h from SEPartly CloudyDrizzle
April 2140°F4°C57°F14°C6 mph10 km/h from SWMostly CloudyPartly Cloudy
April 2237°F3°C63°F17°C6 mph10 km/h from NMostly ClearMostly Cloudy
April 2341°F5°C69°F21°C4 mph7 km/h from WPartly CloudyMostly Cloudy
April 2443°F6°C56°F13°C5 mph8 km/h from SWDrizzleDrizzle
April 2541°F5°C56°F13°C5 mph9 km/h from SWCloudyMostly Cloudy

Yes

Low of 45°F7°C, High of 72°F22°C
Wind: 10 mph16 km/h
Precipitation: 30% rain

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