Yes

you do need a jacket based on the weather in Mountain View, CA 94040, USA 1 second ago

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
55°F13°C & Clear

Wind is 1 mph2 km/h from the South, gusting to 2 mph3 km/h
July 10
7am55°F13°C1 mph2 km/h SouthwestMostly Clear
8am54°F12°C1 mph2 km/h WestMostly Clear
9am54°F12°C2 mph3 km/h SouthPartly Cloudy
10am55°F13°C2 mph3 km/h SoutheastPartly Cloudy
11am59°F15°C1 mph2 km/h NorthMostly Clear
12pm64°F18°C2 mph3 km/h NorthClear
1pm70°F21°C3 mph4 km/h NorthClear
2pm75°F24°C4 mph6 km/h NorthClear
3pm79°F26°C5 mph7 km/h NorthClear
4pm83°F28°C6 mph9 km/h NorthwestClear
5pm85°F30°C6 mph10 km/h NorthwestClear
6pm86°F30°C7 mph11 km/h NorthwestClear
DateLowHighWindDayNight
July 1054°F12°C86°F30°C5 mph8 km/h from NorthwestClearClear
July 1156°F13°C85°F29°C4 mph6 km/h from NorthwestClearClear
July 1255°F13°C82°F28°C3 mph5 km/h from NorthwestClearMostly Clear
July 1354°F12°C79°F26°C4 mph6 km/h from NorthwestClearMostly Clear
July 1454°F12°C78°F26°C4 mph6 km/h from NorthwestClearClear
July 1554°F12°C76°F24°C3 mph5 km/h from SouthwestClearPartly Cloudy
July 1655°F13°C73°F23°C4 mph6 km/h from SouthwestMostly ClearMostly Clear

Yes

Low of 55°F13°C, High of 85°F30°C
Wind: 4 mph6 km/h
Precipitation: None

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