Yes

you do need a jacket based on the weather in Santa Clara, CA 95054, USA 1 second ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
56°F13°C & Partly Cloudy

Wind is 5 mph8 km/h from the North, gusting to 10 mph16 km/h
May 25
1am56°F13°C5 mph8 km/h NorthClear
2am55°F13°C4 mph7 km/h NorthMostly Clear
3am54°F12°C4 mph6 km/h NorthMostly Clear
4am53°F12°C4 mph6 km/h NorthMostly Clear
5am52°F11°C3 mph6 km/h NorthMostly Clear
6am51°F11°C3 mph5 km/h EastMostly Clear
7am51°F11°C3 mph4 km/h SoutheastPartly Cloudy
8am51°F10°C2 mph4 km/h SouthwestPartly Cloudy
9am51°F10°C3 mph4 km/h SouthwestPartly Cloudy
10am52°F11°C2 mph3 km/h SouthwestPartly Cloudy
11am55°F13°C3 mph4 km/h WestPartly Cloudy
12pm57°F14°C4 mph6 km/h WestMostly Cloudy
DateLowHighWindDayNight
May 2452°F11°C68°F20°C5 mph8 km/h from NorthwestMostly ClearMostly Clear
May 2551°F10°C69°F20°C7 mph12 km/h from NorthwestPartly CloudyMostly Cloudy
May 2653°F12°C73°F23°C8 mph13 km/h from NorthwestMostly ClearMostly Clear
May 2750°F10°C79°F26°C5 mph8 km/h from NorthwestClearMostly Clear
May 2853°F11°C70°F21°C6 mph10 km/h from NorthwestMostly ClearMostly Clear
May 2952°F11°C79°F26°C5 mph8 km/h from NorthwestMostly ClearClear
May 3055°F13°C87°F30°C4 mph7 km/h from NorthwestClearClear

Yes

Low of 51°F11°C, High of 69°F21°C
Wind: 7 mph12 km/h
Precipitation: None

Support This Page