No
you don't need a jacket based on the weather in Chelmsford, MA, USA 1 second ago
61°F16°C & Clear
Wind is 6 mph9 km/h from the Northwest, gusting to 14 mph22 km/h
| September 19 | ||||
| 7am | 61°F16°C | 5 mph9 km/h Northwest | Clear | |
| 8am | 65°F18°C | 6 mph9 km/h Northwest | Clear | |
| 9am | 69°F20°C | 8 mph13 km/h Northwest | Clear | |
| 10am | 72°F22°C | 9 mph14 km/h Northwest | Clear | |
| 11am | 73°F23°C | 9 mph15 km/h Northwest | Mostly Clear | |
| 12pm | 75°F24°C | 9 mph15 km/h Northwest | Mostly Clear | |
| 1pm | 75°F24°C | 8 mph13 km/h Northwest | Mostly Clear | |
| 2pm | 76°F25°C | 8 mph13 km/h Northwest | Mostly Clear | |
| 3pm | 77°F25°C | 8 mph13 km/h Northwest | Mostly Clear | |
| 4pm | 77°F25°C | 8 mph12 km/h Northwest | Clear | |
| 5pm | 75°F24°C | 8 mph13 km/h Northwest | Clear | |
| 6pm | 73°F23°C | 7 mph12 km/h North | Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 19 | 56°F13°C | 77°F25°C | 8 mph13 km/h from Northwest | Clear | Clear |
| September 20 | 49°F9°C | 68°F20°C | 3 mph5 km/h from Northeast | Mostly Clear | Mostly Clear |
| September 21 | 45°F7°C | 68°F20°C | 5 mph8 km/h from Southeast | Partly Cloudy | Partly Cloudy |
| September 22 | 48°F9°C | 72°F22°C | 4 mph7 km/h from South | Partly Cloudy | Partly Cloudy |
| September 23 | 58°F14°C | 80°F27°C | 5 mph8 km/h from Southwest | Drizzle | Rain |
| September 24 | 58°F14°C | 71°F21°C | 6 mph10 km/h from North | Thunderstorms | Partly Cloudy |
| September 25 | 56°F13°C | 67°F20°C | 5 mph8 km/h from Northwest | Partly Cloudy | Partly Cloudy |
Yes
Low of 49°F10°C, High of 68°F20°CWind: 3 mph5 km/h
Precipitation: None