Yes

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

Why? Because just cool enough for a jacket, but not warm enough to ditch it and it's really really huffing out there!
53°F11°C & Windy

Wind is 15 mph24 km/h from the Southwest, gusting to 32 mph51 km/h
February 14
12am53°F11°C15 mph25 km/h SouthwestDrizzle
1am52°F11°C11 mph17 km/h SouthwestDrizzle
2am52°F11°C10 mph16 km/h SouthwestCloudy
3am51°F11°C7 mph12 km/h SouthwestCloudy
4am51°F10°C9 mph14 km/h SouthwestCloudy
5am50°F10°C10 mph17 km/h SouthwestCloudy
6am50°F10°C9 mph14 km/h SouthwestMostly Cloudy
7am49°F9°C7 mph12 km/h SouthwestDrizzle
8am49°F9°C8 mph13 km/h WestDrizzle
9am49°F9°C7 mph12 km/h WestDrizzle
10am49°F9°C8 mph12 km/h WestMostly Cloudy
11am50°F10°C8 mph13 km/h WestMostly Cloudy
DateLowHighWindDayNight
February 1350°F10°C54°F12°C6 mph10 km/h from SouthwestHeavy RainHeavy Rain
February 1447°F8°C55°F13°C9 mph14 km/h from SouthwestDrizzlePartly Cloudy
February 1544°F7°C62°F17°C3 mph6 km/h from NortheastPartly CloudyMostly Cloudy
February 1649°F9°C67°F20°C3 mph5 km/h from NorthwestMostly CloudyPartly Cloudy
February 1749°F9°C63°F17°C4 mph6 km/h from SouthwestPartly CloudyMostly Cloudy
February 1847°F9°C64°F18°C4 mph6 km/h from NortheastPartly CloudyMostly Cloudy
February 1950°F10°C68°F20°C3 mph5 km/h from WestPartly CloudyMostly Clear

Yes

Low of 47°F9°C, High of 55°F13°C
Wind: 9 mph14 km/h
Precipitation: 40% rain

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