No

you don't need a jacket based on the weather in Dereham, UK 1 second ago

66°F19°C & Partly Cloudy

Wind is 6 mph9 km/h from the Northwest, gusting to 12 mph19 km/h
July 26
4am68°F20°C6 mph10 km/h NorthwestPartly Cloudy
5am69°F21°C6 mph10 km/h NorthwestMostly Cloudy
6am70°F21°C8 mph12 km/h WestCloudy
7am69°F21°C7 mph12 km/h NorthwestCloudy
8am69°F20°C7 mph11 km/h NorthwestCloudy
9am68°F20°C6 mph10 km/h NorthwestCloudy
10am67°F19°C6 mph9 km/h NorthwestRain
11am66°F19°C5 mph8 km/h NorthwestRain
12pm66°F19°C5 mph8 km/h NorthwestCloudy
1pm66°F19°C4 mph7 km/h NorthMostly Cloudy
2pm66°F19°C4 mph6 km/h NorthPartly Cloudy
3pm65°F18°C3 mph5 km/h NorthPartly Cloudy
DateLowHighWindDayNight
July 2559°F15°C70°F21°C6 mph10 km/h from NorthwestRainMostly Cloudy
July 2656°F13°C69°F21°C9 mph14 km/h from NorthwestMostly CloudyPartly Cloudy
July 2754°F12°C71°F22°C11 mph17 km/h from NorthwestPartly CloudyPartly Cloudy
July 2854°F12°C69°F20°C8 mph14 km/h from NorthwestDrizzleDrizzle
July 2957°F14°C71°F22°C8 mph13 km/h from NorthwestDrizzlePartly Cloudy
July 3057°F14°C70°F21°C9 mph14 km/h from NorthwestMostly CloudyPartly Cloudy
July 3156°F13°C68°F20°C10 mph16 km/h from NorthwestPartly CloudyDrizzle

Yes

Low of 56°F14°C, High of 69°F21°C
Wind: 9 mph14 km/h
Precipitation: 19% rain

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