Yes
you do need a jacket based on the weather in Chalfont St Giles, Chalfont Saint Giles HP8, UK 1 second ago
Why? Because it's pretty chilly and the wind is harsh and biting!
54°F12°C & Partly Cloudy
Wind is 12 mph19 km/h from the Southwest, gusting to 23 mph37 km/h
| September 11 | ||||
| 5pm | 54°F12°C | 12 mph20 km/h Southwest | Partly Cloudy | |
| 6pm | 54°F12°C | 13 mph20 km/h Southwest | Partly Cloudy | |
| 7pm | 53°F12°C | 13 mph21 km/h Southwest | Mostly Cloudy | |
| 8pm | 52°F11°C | 13 mph21 km/h Southwest | Mostly Cloudy | |
| 9pm | 52°F11°C | 13 mph21 km/h Southwest | Partly Cloudy | |
| 10pm | 52°F11°C | 13 mph21 km/h Southwest | Partly Cloudy | |
| 11pm | 52°F11°C | 12 mph20 km/h Southwest | Mostly Cloudy | |
| September 12 | ||||
| 12am | 51°F11°C | 12 mph19 km/h Southwest | Partly Cloudy | |
| 1am | 51°F11°C | 11 mph17 km/h Southwest | Mostly Cloudy | |
| 2am | 51°F11°C | 11 mph17 km/h Southwest | Partly Cloudy | |
| 3am | 52°F11°C | 11 mph17 km/h Southwest | Partly Cloudy | |
| 4am | 54°F12°C | 12 mph20 km/h Southwest | Partly Cloudy | |
| Date | Low | High | Wind | Day | Night |
|---|---|---|---|---|---|
| September 10 | 52°F11°C | 63°F17°C | 9 mph14 km/h from Southwest | Rain | Drizzle |
| September 11 | 51°F11°C | 62°F17°C | 13 mph21 km/h from Southwest | Drizzle | Drizzle |
| September 12 | 52°F11°C | 62°F17°C | 12 mph20 km/h from Southwest | Drizzle | Partly Cloudy |
| September 13 | 48°F9°C | 65°F19°C | 11 mph18 km/h from South | Rain | Drizzle |
| September 14 | 55°F13°C | 64°F18°C | 21 mph34 km/h from Southwest | Drizzle | Windy |
| September 15 | 52°F11°C | 63°F17°C | 14 mph23 km/h from West | Mostly Cloudy | Mostly Cloudy |
| September 16 | 52°F11°C | 63°F17°C | 14 mph22 km/h from Southwest | Rain | Mostly Cloudy |
Yes
Low of 51°F11°C, High of 62°F17°CWind: 13 mph21 km/h
Precipitation: 49% rain