Yes

you do need a jacket based on the weather in Lytham St Annes, Lytham Saint Annes FY8, UK 1 second ago

Why? Because it's not very warm out!
52°F11°C & Partly Cloudy

Wind is 11 mph17 km/h from the Southeast, gusting to 19 mph30 km/h
September 9
12am52°F11°C11 mph18 km/h SoutheastMostly Cloudy
1am52°F11°C11 mph18 km/h SoutheastPartly Cloudy
2am51°F11°C12 mph19 km/h SoutheastMostly Cloudy
3am53°F12°C12 mph19 km/h SoutheastMostly Clear
4am55°F13°C13 mph21 km/h SoutheastMostly Clear
5am57°F14°C14 mph22 km/h SoutheastMostly Clear
6am60°F16°C15 mph23 km/h SoutheastMostly Clear
7am63°F17°C15 mph24 km/h SoutheastWindy
8am65°F18°C15 mph24 km/h SouthWindy
9am66°F19°C14 mph23 km/h SouthPartly Cloudy
10am67°F19°C14 mph23 km/h SouthPartly Cloudy
11am67°F19°C14 mph23 km/h SoutheastMostly Cloudy
DateLowHighWindDayNight
September 851°F11°C67°F19°C14 mph22 km/h from SoutheastPartly CloudyMostly Cloudy
September 956°F13°C64°F18°C15 mph25 km/h from SouthRainRain
September 1054°F12°C59°F15°C20 mph32 km/h from SouthwestRainRain
September 1152°F11°C60°F15°C17 mph28 km/h from SouthwestRainRain
September 1252°F11°C59°F15°C17 mph28 km/h from SouthwestRainDrizzle
September 1352°F11°C63°F17°C18 mph30 km/h from SouthRainRain
September 1455°F13°C61°F16°C30 mph48 km/h from SouthwestDrizzleDrizzle

Yes

Low of 56°F14°C, High of 64°F18°C
Wind: 15 mph25 km/h
Precipitation: 68% rain

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