No
you don't need a jacket based on the weather in Hemel Hempstead, UK 1 second ago
60°F15°C & Mostly Clear
Wind is 11 mph18 km/h from the NE, gusting to 22 mph36 km/h
| September 19 | ||||
| 5pm | 59°F15°C | 12 mph19 km/h NE | Mostly Clear | |
| 6pm | 58°F14°C | 11 mph18 km/h NE | Partly Cloudy | |
| 7pm | 57°F14°C | 11 mph18 km/h NE | Partly Cloudy | |
| 8pm | 56°F13°C | 10 mph17 km/h NE | Partly Cloudy | |
| 9pm | 56°F13°C | 10 mph17 km/h NE | Mostly Cloudy | |
| 10pm | 56°F13°C | 11 mph17 km/h NE | Mostly Cloudy | |
| 11pm | 56°F13°C | 11 mph17 km/h NE | Cloudy | |
| September 20 | ||||
| 12am | 55°F13°C | 11 mph18 km/h NE | Cloudy | |
| 1am | 56°F13°C | 11 mph17 km/h NE | Mostly Cloudy | |
| 2am | 56°F13°C | 10 mph16 km/h NE | Mostly Cloudy | |
| 3am | 57°F14°C | 11 mph18 km/h NE | Mostly Cloudy | |
| 4am | 59°F15°C | 12 mph20 km/h NE | Mostly Cloudy | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 18 | 57°F14°C | 75°F24°C | 9 mph15 km/h from NE | Partly Cloudy | Partly Cloudy |
| September 19 | 55°F13°C | 70°F21°C | 11 mph18 km/h from NE | Partly Cloudy | Mostly Clear |
| September 20 | 55°F13°C | 70°F21°C | 8 mph14 km/h from E | Rain | Rain |
| September 21 | 58°F14°C | 65°F19°C | 7 mph12 km/h from E | Rain | Rain |
| September 22 | 55°F13°C | 62°F17°C | 6 mph10 km/h from NW | Rain | Drizzle |
| September 23 | 49°F9°C | 62°F17°C | 6 mph9 km/h from SW | Mostly Cloudy | Mostly Cloudy |
| September 24 | 50°F10°C | 61°F16°C | 10 mph17 km/h from SE | Drizzle | Mostly Cloudy |
Yes
Low of 55°F13°C, High of 70°F21°CWind: 11 mph18 km/h
Precipitation: 19% rain