Yes

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

Why? Because just cool enough for a jacket, but not warm enough to ditch it!
58°F15°C & Mostly Cloudy

Wind is 1 mph1 km/h from the Southwest, gusting to 2 mph4 km/h
June 6
9am59°F15°C0 mph1 km/h WestMostly Cloudy
10am60°F15°C1 mph1 km/h WestMostly Cloudy
11am61°F16°C1 mph2 km/h WestMostly Cloudy
12pm64°F18°C2 mph2 km/h SouthwestPartly Cloudy
1pm69°F20°C2 mph4 km/h SouthwestMostly Clear
2pm74°F23°C3 mph5 km/h SouthwestClear
3pm79°F26°C4 mph7 km/h SouthwestClear
4pm82°F28°C6 mph9 km/h SouthwestClear
5pm85°F29°C7 mph11 km/h SouthwestClear
6pm86°F30°C8 mph12 km/h SouthwestClear
7pm86°F30°C9 mph14 km/h SouthwestClear
8pm84°F29°C9 mph14 km/h SouthwestClear
DateLowHighWindDayNight
June 658°F15°C86°F30°C5 mph8 km/h from SouthwestMostly ClearMostly Clear
June 759°F15°C86°F30°C5 mph8 km/h from SouthwestMostly ClearClear
June 860°F16°C88°F31°C5 mph8 km/h from SouthwestClearClear
June 961°F16°C89°F32°C5 mph8 km/h from SouthwestClearClear
June 1062°F17°C91°F33°C5 mph8 km/h from SouthwestClearMostly Clear
June 1164°F18°C88°F31°C5 mph8 km/h from SouthwestClearMostly Clear
June 1262°F17°C84°F29°C5 mph8 km/h from SouthwestMostly ClearClear

No

Low of 59°F15°C, High of 86°F30°C
Wind: 5 mph8 km/h
Precipitation: None

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