Yes
you do need a jacket based on the weather in Jefferson County, CO, USA 1 second ago
Why? Because it's not very warm out!
51°F11°C & Cloudy
Wind is 5 mph8 km/h from the West, gusting to 10 mph16 km/h
| September 17 | ||||
| 12am | 50°F10°C | 3 mph5 km/h Southwest | Rain | |
| 1am | 50°F10°C | 6 mph9 km/h South | Mostly Cloudy | |
| 2am | 49°F9°C | 4 mph6 km/h North | Partly Cloudy | |
| 3am | 48°F9°C | 4 mph7 km/h West | Partly Cloudy | |
| 4am | 47°F8°C | 4 mph7 km/h West | Mostly Cloudy | |
| 5am | 46°F8°C | 4 mph7 km/h Northwest | Partly Cloudy | |
| 6am | 46°F8°C | 3 mph5 km/h Northwest | Mostly Clear | |
| 7am | 45°F7°C | 3 mph5 km/h West | Partly Cloudy | |
| 8am | 44°F7°C | 3 mph5 km/h West | Mostly Clear | |
| 9am | 44°F7°C | 4 mph6 km/h West | Mostly Clear | |
| 10am | 47°F8°C | 3 mph5 km/h West | Mostly Clear | |
| 11am | 51°F10°C | 3 mph5 km/h East | Mostly Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 16 | 48°F9°C | 66°F19°C | 4 mph7 km/h from Northeast | Partly Cloudy | Rain |
| September 17 | 44°F7°C | 62°F16°C | 5 mph8 km/h from East | Partly Cloudy | Rain |
| September 18 | 42°F6°C | 62°F16°C | 5 mph7 km/h from East | Mostly Clear | Mostly Clear |
| September 19 | 45°F7°C | 68°F20°C | 5 mph8 km/h from East | Mostly Clear | Partly Cloudy |
| September 20 | 50°F10°C | 71°F21°C | 5 mph8 km/h from North | Partly Cloudy | Mostly Clear |
| September 21 | 54°F12°C | 70°F21°C | 6 mph9 km/h from Northwest | Partly Cloudy | Mostly Clear |
| September 22 | 53°F11°C | 69°F21°C | 6 mph10 km/h from North | Mostly Clear | Clear |
Yes
Low of 44°F7°C, High of 62°F17°CWind: 5 mph8 km/h
Precipitation: 23% rain