Yes
you do need a jacket based on the weather in Aarau, Switzerland 1 second ago
Why? Because it's cool. Pleasantly cool, but cool.
59°F15°C & Mostly Clear
Wind is 1 mph1 km/h from the SE, gusting to 5 mph8 km/h
| September 21 | ||||
| 5am | 61°F16°C | 1 mph2 km/h E | Mostly Clear | |
| 6am | 65°F18°C | 1 mph2 km/h E | Clear | |
| 7am | 68°F20°C | 1 mph2 km/h E | Mostly Clear | |
| 8am | 70°F21°C | 2 mph3 km/h NE | Mostly Clear | |
| 9am | 71°F22°C | 2 mph4 km/h NE | Partly Cloudy | |
| 10am | 72°F22°C | 3 mph5 km/h NE | Mostly Clear | |
| 11am | 72°F22°C | 3 mph5 km/h NE | Mostly Clear | |
| 12pm | 70°F21°C | 2 mph3 km/h E | Partly Cloudy | |
| 1pm | 66°F19°C | 2 mph3 km/h E | Mostly Clear | |
| 2pm | 63°F17°C | 2 mph3 km/h E | Clear | |
| 3pm | 61°F16°C | 1 mph2 km/h NE | Mostly Clear | |
| 4pm | 59°F15°C | 1 mph2 km/h N | Mostly Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 20 | 49°F9°C | 72°F22°C | 2 mph3 km/h from E | Mostly Clear | Partly Cloudy |
| September 21 | 48°F9°C | 71°F22°C | 1 mph2 km/h from NE | Mostly Cloudy | Drizzle |
| September 22 | 54°F12°C | 63°F17°C | 4 mph6 km/h from SW | Drizzle | Drizzle |
| September 23 | 50°F10°C | 64°F18°C | 6 mph10 km/h from SW | Drizzle | Partly Cloudy |
| September 24 | 46°F8°C | 66°F19°C | 4 mph6 km/h from SW | Mostly Cloudy | Rain |
| September 25 | 56°F13°C | 66°F19°C | 11 mph17 km/h from SW | Drizzle | Rain |
| September 26 | 47°F8°C | 60°F16°C | 12 mph20 km/h from W | Drizzle | Partly Cloudy |
Yes
Low of 48°F9°C, High of 72°F22°CWind: 1 mph2 km/h
Precipitation: None