Yes

you do need a jacket based on the weather in Haverfordwest, UK 1 second ago

Why? Because you're not freezing, but you’ll definitely start complaining if it lasts much longer!
41°F5°C & Partly Cloudy

Wind is 7 mph11 km/h from the Southeast, gusting to 12 mph20 km/h
January 15
11pm41°F5°C7 mph11 km/h SoutheastPartly Cloudy
January 16
12am41°F5°C7 mph11 km/h SoutheastPartly Cloudy
1am41°F5°C7 mph12 km/h SoutheastPartly Cloudy
2am40°F5°C8 mph12 km/h SoutheastPartly Cloudy
3am41°F5°C8 mph13 km/h SoutheastPartly Cloudy
4am41°F5°C8 mph13 km/h SoutheastPartly Cloudy
5am43°F6°C9 mph15 km/h SoutheastMostly Clear
6am45°F7°C10 mph16 km/h SoutheastPartly Cloudy
7am47°F8°C11 mph18 km/h SoutheastPartly Cloudy
8am47°F8°C11 mph18 km/h SoutheastPartly Cloudy
9am47°F8°C12 mph19 km/h SoutheastPartly Cloudy
10am47°F9°C12 mph19 km/h SouthPartly Cloudy
DateLowHighWindDayNight
January 1540°F5°C47°F9°C10 mph17 km/h from SoutheastPartly CloudyCloudy
January 1642°F6°C48°F9°C12 mph19 km/h from SouthMostly CloudyMostly Cloudy
January 1742°F5°C47°F8°C13 mph21 km/h from SoutheastMostly CloudyMostly Cloudy
January 1840°F5°C48°F9°C14 mph22 km/h from SoutheastMostly CloudyDrizzle
January 1946°F8°C50°F10°C7 mph12 km/h from SouthCloudyCloudy
January 2042°F6°C46°F8°C10 mph17 km/h from SoutheastCloudyCloudy
January 2140°F4°C45°F7°C11 mph18 km/h from EastCloudyDrizzle

Yes

Low of 42°F6°C, High of 48°F9°C
Wind: 12 mph19 km/h
Precipitation: None

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