Yes

you do need a jacket based on the weather in Whanganui, 4500, New Zealand 1 second ago

Why? Because it's cool enough your breath is visible, but your nose isn’t red yet!
49°F9°C & Mostly Cloudy

Wind is 6 mph9 km/h from the Northwest, gusting to 13 mph21 km/h
September 11
5am48°F9°C6 mph9 km/h NorthMostly Cloudy
6am47°F9°C5 mph9 km/h NorthCloudy
7am47°F8°C5 mph9 km/h NorthCloudy
8am46°F8°C5 mph8 km/h NortheastCloudy
9am46°F8°C5 mph8 km/h NortheastCloudy
10am46°F8°C5 mph7 km/h NortheastCloudy
11am46°F8°C4 mph7 km/h NortheastCloudy
12pm46°F8°C4 mph7 km/h NortheastCloudy
1pm46°F8°C5 mph8 km/h NortheastDrizzle
2pm46°F8°C5 mph8 km/h NortheastDrizzle
3pm46°F8°C6 mph10 km/h EastRain
4pm47°F8°C8 mph12 km/h EastRain
DateLowHighWindDayNight
September 1046°F8°C56°F13°C14 mph23 km/h from WestPartly CloudyRain
September 1146°F8°C51°F11°C10 mph16 km/h from SouthRainMostly Clear
September 1247°F8°C55°F13°C25 mph40 km/h from WestRainRain
September 1349°F9°C59°F15°C16 mph25 km/h from WestDrizzleMostly Clear
September 1447°F8°C60°F15°C18 mph30 km/h from WestWindyWindy
September 1553°F12°C62°F16°C15 mph24 km/h from WestWindyMostly Cloudy
September 1654°F12°C64°F18°C17 mph28 km/h from NorthwestWindyDrizzle

Yes

Low of 46°F8°C, High of 51°F11°C
Wind: 10 mph16 km/h
Precipitation: 90% rain

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