Yes

you do need a jacket based on the weather in Mammoth Lakes, CA 93546, USA 1 second ago

Why? Because there's a refreshing nip in the air!
40°F4°C & Cloudy

Wind is 7 mph12 km/h from the Southwest, gusting to 15 mph24 km/h
October 25
4pm43°F6°C9 mph15 km/h SouthwestMostly Cloudy
5pm46°F8°C15 mph25 km/h SouthwestWindy
6pm48°F9°C18 mph28 km/h SouthwestWindy
7pm50°F10°C19 mph31 km/h SouthwestWindy
8pm51°F10°C22 mph35 km/h SouthwestWindy
9pm51°F10°C22 mph35 km/h SouthwestWindy
10pm50°F10°C21 mph33 km/h SouthwestWindy
11pm49°F9°C18 mph29 km/h SouthwestWindy
October 26
12am46°F8°C16 mph25 km/h SouthwestWindy
1am44°F7°C13 mph22 km/h SouthwestMostly Cloudy
2am42°F6°C12 mph19 km/h SouthwestMostly Cloudy
3am41°F5°C11 mph18 km/h SouthwestPartly Cloudy
DateLowHighWindDayNight
October 2537°F3°C51°F11°C16 mph25 km/h from SouthwestWindyPartly Cloudy
October 2635°F2°C49°F9°C13 mph21 km/h from SouthwestPartly CloudyMostly Clear
October 2737°F3°C59°F15°C4 mph7 km/h from WestClearClear
October 2837°F3°C60°F16°C2 mph4 km/h from SoutheastClearClear
October 2939°F4°C60°F16°C4 mph6 km/h from SouthwestClearMostly Clear
October 3039°F4°C58°F15°C4 mph6 km/h from WestPartly CloudyClear
October 3136°F2°C58°F15°C2 mph3 km/h from NortheastMostly ClearClear

Yes

Low of 36°F2°C, High of 48°F9°C
Wind: 13 mph21 km/h
Precipitation: None

Support This Page