No
you don't need a jacket based on the weather in Hemel Hempstead, UK 1 second ago
64°F18°C & Mostly Cloudy
Wind is 6 mph10 km/h from the Southwest, gusting to 13 mph21 km/h
| September 19 | ||||
| 6pm | 63°F17°C | 7 mph10 km/h Southwest | Mostly Cloudy | |
| 7pm | 62°F16°C | 7 mph11 km/h Southwest | Partly Cloudy | |
| 8pm | 61°F16°C | 6 mph10 km/h Southwest | Partly Cloudy | |
| 9pm | 59°F15°C | 6 mph10 km/h Southwest | Mostly Cloudy | |
| 10pm | 58°F15°C | 6 mph10 km/h Southwest | Mostly Cloudy | |
| 11pm | 58°F14°C | 6 mph10 km/h Southwest | Mostly Cloudy | |
| September 20 | ||||
| 12am | 57°F14°C | 6 mph10 km/h Southwest | Mostly Cloudy | |
| 1am | 57°F14°C | 6 mph10 km/h Southwest | Mostly Cloudy | |
| 2am | 57°F14°C | 5 mph9 km/h South | Cloudy | |
| 3am | 58°F15°C | 7 mph11 km/h South | Cloudy | |
| 4am | 60°F16°C | 10 mph15 km/h South | Cloudy | |
| 5am | 62°F17°C | 9 mph15 km/h Southwest | Cloudy | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 18 | 58°F15°C | 79°F26°C | 6 mph10 km/h from South | Partly Cloudy | Partly Cloudy |
| September 19 | 54°F12°C | 69°F20°C | 13 mph20 km/h from South | Drizzle | Partly Cloudy |
| September 20 | 47°F8°C | 58°F14°C | 9 mph15 km/h from North | Partly Cloudy | Mostly Clear |
| September 21 | 42°F6°C | 59°F15°C | 11 mph18 km/h from North | Mostly Clear | Mostly Clear |
| September 22 | 41°F5°C | 59°F15°C | 8 mph13 km/h from North | Partly Cloudy | Mostly Clear |
| September 23 | 44°F7°C | 61°F16°C | 8 mph13 km/h from North | Mostly Cloudy | Partly Cloudy |
| September 24 | 45°F7°C | 61°F16°C | 8 mph13 km/h from Northeast | Partly Cloudy | Partly Cloudy |
Yes
Low of 54°F12°C, High of 69°F21°CWind: 13 mph20 km/h
Precipitation: 38% rain