No
you don't need a jacket based on the weather in Lake Forest, IL, USA 1 second ago
62°F16°C & Mostly Clear
Wind is 3 mph5 km/h from the Northwest, gusting to 4 mph7 km/h
| September 17 | ||||
| 9am | 63°F17°C | 3 mph5 km/h Northwest | Partly Cloudy | |
| 10am | 67°F20°C | 1 mph2 km/h North | Partly Cloudy | |
| 11am | 72°F22°C | 1 mph2 km/h Northeast | Mostly Clear | |
| 12pm | 75°F24°C | 3 mph5 km/h East | Clear | |
| 1pm | 76°F24°C | 5 mph9 km/h East | Mostly Clear | |
| 2pm | 77°F25°C | 6 mph10 km/h East | Clear | |
| 3pm | 77°F25°C | 6 mph10 km/h East | Partly Cloudy | |
| 4pm | 78°F26°C | 5 mph9 km/h East | Mostly Clear | |
| 5pm | 78°F26°C | 5 mph8 km/h East | Mostly Clear | |
| 6pm | 77°F25°C | 5 mph8 km/h East | Clear | |
| 7pm | 75°F24°C | 4 mph6 km/h East | Clear | |
| 8pm | 73°F23°C | 3 mph5 km/h East | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 17 | 59°F15°C | 78°F26°C | 4 mph7 km/h from East | Mostly Clear | Clear |
| September 18 | 63°F17°C | 80°F27°C | 5 mph7 km/h from East | Mostly Clear | Mostly Clear |
| September 19 | 66°F19°C | 78°F25°C | 8 mph12 km/h from East | Mostly Clear | Partly Cloudy |
| September 20 | 64°F18°C | 76°F25°C | 7 mph11 km/h from Southeast | Partly Cloudy | Thunderstorms |
| September 21 | 65°F18°C | 78°F26°C | 8 mph13 km/h from Southwest | Mostly Cloudy | Rain |
| September 22 | 65°F18°C | 77°F25°C | 7 mph12 km/h from Southwest | Thunderstorms | Drizzle |
| September 23 | 64°F18°C | 74°F24°C | 7 mph11 km/h from Southwest | Drizzle | Partly Cloudy |
No
Low of 63°F17°C, High of 80°F27°CWind: 5 mph7 km/h
Precipitation: None