Yes
you do need a jacket based on the weather in Hemel Hempstead, UK 1 second ago
Why? Because it's quite chilly.
35°F2°C & Mostly Cloudy
Wind is 4 mph7 km/h from the SW, gusting to 11 mph17 km/h
| April 25 | ||||
| 1am | 36°F2°C | 5 mph8 km/h SW | Cloudy | |
| 2am | 37°F3°C | 5 mph8 km/h SW | Cloudy | |
| 3am | 40°F5°C | 6 mph9 km/h SW | Mostly Cloudy | |
| 4am | 44°F7°C | 7 mph12 km/h SW | Mostly Cloudy | |
| 5am | 48°F9°C | 8 mph12 km/h W | Mostly Cloudy | |
| 6am | 50°F10°C | 9 mph14 km/h W | Mostly Cloudy | |
| 7am | 50°F10°C | 10 mph16 km/h W | Mostly Cloudy | |
| 8am | 51°F10°C | 10 mph16 km/h W | Mostly Cloudy | |
| 9am | 51°F10°C | 8 mph13 km/h W | Cloudy | |
| 10am | 52°F11°C | 7 mph11 km/h W | Cloudy | |
| 11am | 52°F11°C | 7 mph11 km/h W | Cloudy | |
| 12pm | 50°F10°C | 6 mph9 km/h NW | Cloudy | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| April 24 | 34°F1°C | 52°F11°C | 7 mph12 km/h from W | Mostly Cloudy | Cloudy |
| April 25 | 37°F3°C | 52°F11°C | 6 mph9 km/h from NE | Cloudy | Drizzle |
| April 26 | 39°F4°C | 54°F12°C | 9 mph14 km/h from NE | Rain | Rain |
| April 27 | 43°F6°C | 53°F12°C | 12 mph19 km/h from W | Rain | Partly Cloudy |
| April 28 | 39°F4°C | 58°F15°C | 10 mph16 km/h from S | Mostly Cloudy | Partly Cloudy |
| April 29 | 44°F7°C | 62°F17°C | 9 mph15 km/h from SE | Mostly Cloudy | Mostly Cloudy |
| April 30 | 48°F9°C | 63°F17°C | 10 mph15 km/h from NE | Cloudy | Mostly Cloudy |
Yes
Low of 37°F3°C, High of 52°F11°CWind: 6 mph9 km/h
Precipitation: 30% rain