Yes

you do need a jacket based on the weather in Haldwani, Uttarakhand 263139, India 14 minutes ago

Why? Because light rain: when the sky can't decide if it’s serious or just messing with you!
75°F24°C & Drizzle

Wind is 1 mph2 km/h from the East, gusting to 3 mph5 km/h
September 16
10pm75°F24°C2 mph3 km/h EastDrizzle
11pm77°F25°C3 mph4 km/h SoutheastDrizzle
September 17
12am78°F26°C4 mph6 km/h SoutheastDrizzle
1am80°F27°C4 mph6 km/h SouthDrizzle
2am82°F28°C4 mph7 km/h SouthDrizzle
3am83°F28°C5 mph8 km/h SouthMostly Cloudy
4am83°F29°C4 mph7 km/h SouthDrizzle
5am83°F28°C4 mph6 km/h SouthRain
6am82°F28°C3 mph5 km/h SouthDrizzle
7am81°F27°C3 mph5 km/h SouthRain
8am80°F27°C3 mph5 km/h SoutheastDrizzle
9am78°F26°C2 mph3 km/h SoutheastPartly Cloudy
DateLowHighWindDayNight
September 1674°F23°C83°F29°C3 mph6 km/h from SouthRainDrizzle
September 1773°F23°C83°F29°C3 mph5 km/h from SouthDrizzleRain
September 1873°F23°C85°F29°C3 mph4 km/h from SouthwestRainThunderstorms
September 1973°F23°C86°F30°C4 mph6 km/h from WestMostly ClearMostly Clear
September 2073°F23°C87°F30°C3 mph6 km/h from SouthwestMostly ClearMostly Clear
September 2174°F23°C88°F31°C3 mph5 km/h from SouthwestMostly ClearMostly Clear
September 2275°F24°C88°F31°C3 mph5 km/h from SouthwestMostly ClearMostly Clear

No

Low of 73°F23°C, High of 83°F29°C
Wind: 3 mph5 km/h
Precipitation: 56% rain

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