Yes
you do need a jacket based on the weather in Harpenden AL5, UK 1 second ago
Why? Because it's cool. Pleasantly cool, but cool and it's so gusty, you’re basically doing accidental parkour!
57°F14°C & Mostly Clear
Wind is 12 mph19 km/h from the West, gusting to 22 mph36 km/h
| September 10 | ||||
| 7pm | 56°F14°C | 12 mph19 km/h West | Mostly Clear | |
| 8pm | 55°F13°C | 12 mph19 km/h West | Clear | |
| 9pm | 54°F12°C | 11 mph17 km/h Southwest | Clear | |
| 10pm | 53°F12°C | 11 mph17 km/h Southwest | Clear | |
| 11pm | 53°F11°C | 10 mph16 km/h Southwest | Mostly Clear | |
| September 11 | ||||
| 12am | 52°F11°C | 10 mph17 km/h Southwest | Partly Cloudy | |
| 1am | 52°F11°C | 11 mph17 km/h Southwest | Mostly Cloudy | |
| 2am | 52°F11°C | 11 mph18 km/h Southwest | Partly Cloudy | |
| 3am | 54°F12°C | 12 mph20 km/h Southwest | Mostly Clear | |
| 4am | 56°F13°C | 13 mph22 km/h Southwest | Mostly Clear | |
| 5am | 58°F14°C | 15 mph24 km/h Southwest | Partly Cloudy | |
| 6am | 60°F15°C | 15 mph25 km/h Southwest | Windy | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 9 | 55°F13°C | 64°F18°C | 8 mph12 km/h from South | Rain | Drizzle |
| September 10 | 52°F11°C | 62°F17°C | 15 mph24 km/h from Southwest | Rain | Partly Cloudy |
| September 11 | 50°F10°C | 63°F17°C | 14 mph22 km/h from Southwest | Drizzle | Drizzle |
| September 12 | 51°F11°C | 63°F17°C | 12 mph19 km/h from Southwest | Drizzle | Partly Cloudy |
| September 13 | 50°F10°C | 65°F18°C | 15 mph25 km/h from South | Thunderstorms | Thunderstorms |
| September 14 | 54°F12°C | 63°F17°C | 22 mph36 km/h from Southwest | Drizzle | Windy |
| September 15 | 52°F11°C | 62°F17°C | 16 mph26 km/h from West | Windy | Mostly Cloudy |
Yes
Low of 52°F11°C, High of 63°F17°CWind: 15 mph24 km/h
Precipitation: 57% rain