Yes

you do need a jacket based on the weather in Treforest, Pontypridd CF37, UK 1 second ago

Why? Because it's so windy, your hat will probably launch into orbit!
64°F18°C & Mostly Cloudy

Wind is 12 mph20 km/h from the Northwest, gusting to 25 mph41 km/h
July 6
12pm64°F18°C13 mph20 km/h NorthwestMostly Cloudy
1pm64°F18°C12 mph19 km/h NorthwestMostly Cloudy
2pm64°F18°C11 mph18 km/h NorthwestPartly Cloudy
3pm62°F17°C9 mph15 km/h NorthwestMostly Cloudy
4pm61°F16°C9 mph14 km/h NorthwestMostly Cloudy
5pm59°F15°C8 mph13 km/h NorthwestCloudy
6pm59°F15°C7 mph12 km/h NorthwestCloudy
7pm58°F14°C8 mph12 km/h NorthwestCloudy
8pm58°F14°C9 mph14 km/h NorthwestCloudy
9pm56°F13°C11 mph18 km/h NorthwestDrizzle
10pm56°F13°C12 mph20 km/h NorthwestCloudy
11pm55°F13°C13 mph22 km/h NorthwestCloudy
DateLowHighWindDayNight
July 558°F14°C67°F19°C8 mph13 km/h from NorthwestDrizzleDrizzle
July 655°F13°C68°F20°C12 mph19 km/h from NorthwestPartly CloudyClear
July 754°F12°C70°F21°C7 mph12 km/h from NorthwestMostly ClearMostly Clear
July 851°F11°C75°F24°C5 mph8 km/h from WestMostly ClearMostly Clear
July 956°F13°C79°F26°C4 mph6 km/h from SouthwestMostly ClearMostly Clear
July 1058°F14°C83°F28°C4 mph6 km/h from SouthClearClear
July 1161°F16°C82°F28°C6 mph9 km/h from EastMostly ClearMostly Clear

Yes

Low of 55°F13°C, High of 69°F21°C
Wind: 12 mph19 km/h
Precipitation: 5% rain

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