Yes

you do need a jacket based on the weather in Cupertino, CA, USA 1 second ago

Why? Because there's a refreshing nip in the air.
50°F10°C & Mostly Cloudy

Wind is 2 mph3 km/h from the S, gusting to 4 mph6 km/h
March 29
3am49°F10°C2 mph4 km/h SMostly Cloudy
4am48°F9°C3 mph4 km/h SCloudy
5am47°F9°C3 mph5 km/h SCloudy
6am47°F8°C3 mph5 km/h SCloudy
7am46°F8°C4 mph6 km/h SCloudy
8am46°F8°C4 mph7 km/h SCloudy
9am46°F8°C5 mph7 km/h SECloudy
10am47°F8°C5 mph9 km/h SEDrizzle
11am48°F9°C6 mph10 km/h SERain
12pm48°F9°C8 mph13 km/h SEDrizzle
1pm50°F10°C10 mph15 km/h SECloudy
2pm52°F11°C12 mph19 km/h SECloudy
DateLowHighWindDayNight
March 2846°F8°C63°F17°C2 mph4 km/h from NWMostly CloudyCloudy
March 2946°F8°C55°F13°C10 mph17 km/h from SERainMostly Cloudy
March 3046°F8°C60°F16°C6 mph9 km/h from EDrizzleDrizzle
March 3145°F7°C64°F18°C4 mph7 km/h from NWPartly CloudyMostly Clear
April 145°F7°C70°F21°C4 mph7 km/h from NWClearClear
April 245°F7°C74°F23°C3 mph5 km/h from NWClearMostly Clear
April 348°F9°C70°F21°C4 mph6 km/h from NWMostly ClearPartly Cloudy

Yes

Low of 46°F8°C, High of 55°F13°C
Wind: 10 mph17 km/h
Precipitation: 84% rain

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