No
you don't need a jacket based on the weather in Harrow, UK 1 second ago
61°F16°C & Mostly Cloudy
Wind is 5 mph8 km/h from the South, gusting to 12 mph20 km/h
| September 19 | ||||
| 1am | 61°F16°C | 5 mph8 km/h South | Partly Cloudy | |
| 2am | 60°F16°C | 5 mph8 km/h South | Partly Cloudy | |
| 3am | 61°F16°C | 5 mph9 km/h South | Mostly Cloudy | |
| 4am | 63°F17°C | 6 mph10 km/h South | Partly Cloudy | |
| 5am | 66°F19°C | 7 mph10 km/h South | Partly Cloudy | |
| 6am | 69°F21°C | 7 mph12 km/h South | Partly Cloudy | |
| 7am | 72°F22°C | 8 mph13 km/h South | Mostly Clear | |
| 8am | 74°F23°C | 9 mph14 km/h South | Mostly Clear | |
| 9am | 76°F24°C | 10 mph15 km/h South | Clear | |
| 10am | 77°F25°C | 10 mph15 km/h South | Mostly Clear | |
| 11am | 77°F25°C | 9 mph15 km/h South | Clear | |
| 12pm | 76°F25°C | 9 mph14 km/h South | Mostly Clear | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 18 | 60°F16°C | 77°F25°C | 8 mph13 km/h from South | Mostly Clear | Partly Cloudy |
| September 19 | 55°F13°C | 70°F21°C | 10 mph16 km/h from Southwest | Drizzle | Rain |
| September 20 | 48°F9°C | 58°F15°C | 9 mph15 km/h from North | Drizzle | Mostly Clear |
| September 21 | 44°F7°C | 59°F15°C | 10 mph17 km/h from North | Mostly Clear | Mostly Clear |
| September 22 | 43°F6°C | 59°F15°C | 8 mph12 km/h from North | Partly Cloudy | Partly Cloudy |
| September 23 | 46°F8°C | 58°F15°C | 7 mph11 km/h from Northeast | Drizzle | Partly Cloudy |
| September 24 | 45°F7°C | 60°F16°C | 7 mph12 km/h from Northeast | Partly Cloudy | Partly Cloudy |
Yes
Low of 55°F13°C, High of 70°F21°CWind: 10 mph16 km/h
Precipitation: 37% rain