No

you don't need a jacket based on the weather in La Crescenta-Montrose, CA, USA 1 second ago

79°F26°C & Cloudy

Wind is 6 mph10 km/h from the South, gusting to 10 mph16 km/h
June 1
4pm80°F27°C8 mph13 km/h SouthwestPartly Cloudy
5pm81°F27°C9 mph14 km/h SouthwestCloudy
6pm80°F26°C8 mph13 km/h SouthMostly Cloudy
7pm80°F27°C8 mph13 km/h SouthwestPartly Cloudy
8pm79°F26°C7 mph12 km/h SouthwestMostly Clear
9pm76°F24°C6 mph10 km/h SouthMostly Clear
10pm72°F22°C5 mph8 km/h SouthClear
11pm68°F20°C4 mph6 km/h SouthMostly Clear
June 2
12am66°F19°C4 mph7 km/h SoutheastMostly Clear
1am65°F18°C4 mph6 km/h SoutheastClear
2am64°F18°C4 mph7 km/h SoutheastClear
3am63°F17°C4 mph6 km/h SoutheastClear
DateLowHighWindDayNight
June 163°F17°C81°F27°C6 mph10 km/h from SouthPartly CloudyClear
June 258°F14°C75°F24°C7 mph11 km/h from SouthClearMostly Clear
June 356°F13°C77°F25°C5 mph8 km/h from SouthwestPartly CloudyPartly Cloudy
June 457°F14°C71°F22°C5 mph9 km/h from SouthMostly ClearClear
June 556°F13°C77°F25°C5 mph8 km/h from SouthClearClear
June 658°F14°C82°F28°C5 mph8 km/h from SouthClearClear
June 761°F16°C84°F29°C4 mph7 km/h from SouthwestClearClear

Yes

Low of 58°F15°C, High of 75°F24°C
Wind: 7 mph11 km/h
Precipitation: None

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