Yes
you do need a jacket based on the weather in Lake Forest (Foothill Ranch), California, United States 1 second ago
Why? Because it's not very warm out.
58°F14°C & Partly Cloudy
Wind is 1 mph2 km/h from the S, gusting to 3 mph5 km/h
| September 20 | ||||
| 5am | 58°F14°C | 2 mph3 km/h S | Partly Cloudy | |
| 6am | 58°F15°C | 2 mph3 km/h SE | Mostly Cloudy | |
| 7am | 59°F15°C | 2 mph3 km/h S | Mostly Cloudy | |
| 8am | 59°F15°C | 2 mph3 km/h S | Mostly Cloudy | |
| 9am | 59°F15°C | 2 mph2 km/h SW | Mostly Cloudy | |
| 10am | 60°F15°C | 2 mph3 km/h SW | Mostly Cloudy | |
| 11am | 61°F16°C | 2 mph2 km/h SW | Mostly Cloudy | |
| 12pm | 63°F17°C | 2 mph3 km/h SW | Partly Cloudy | |
| 1pm | 66°F19°C | 3 mph5 km/h SW | Partly Cloudy | |
| 2pm | 69°F21°C | 3 mph5 km/h SW | Partly Cloudy | |
| 3pm | 72°F22°C | 5 mph8 km/h SW | Mostly Clear | |
| 4pm | 73°F23°C | 8 mph13 km/h SW | Partly Cloudy | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 20 | 58°F14°C | 73°F23°C | 5 mph8 km/h from SW | Partly Cloudy | Mostly Clear |
| September 21 | 57°F14°C | 77°F25°C | 5 mph8 km/h from SW | Mostly Clear | Clear |
| September 22 | 58°F15°C | 84°F29°C | 5 mph8 km/h from W | Clear | Clear |
| September 23 | 61°F16°C | 87°F30°C | 4 mph7 km/h from W | Clear | Clear |
| September 24 | 63°F17°C | 86°F30°C | 4 mph7 km/h from SW | Clear | Clear |
| September 25 | 62°F17°C | 84°F29°C | 5 mph7 km/h from W | Clear | Clear |
| September 26 | 62°F16°C | 83°F28°C | 4 mph7 km/h from W | Mostly Clear | Mostly Clear |
Yes
Low of 57°F14°C, High of 77°F25°CWind: 5 mph8 km/h
Precipitation: None