Yes

you do need a jacket based on the weather in St Petersburg, Russia 1 second ago

Why? Because it's pretty chilly.
54°F12°C & Cloudy

Wind is 5 mph8 km/h from the S, gusting to 12 mph19 km/h
March 29
10am53°F12°C5 mph8 km/h SCloudy
11am52°F11°C5 mph8 km/h SCloudy
12pm50°F10°C5 mph8 km/h SWDrizzle
1pm48°F9°C5 mph8 km/h SWRain
2pm46°F8°C7 mph11 km/h WRain
3pm43°F6°C10 mph16 km/h WRain
4pm41°F5°C11 mph17 km/h WRain
5pm40°F4°C11 mph18 km/h WDrizzle
6pm39°F4°C11 mph17 km/h WDrizzle
7pm40°F4°C11 mph18 km/h WDrizzle
8pm40°F4°C12 mph19 km/h WDrizzle
9pm40°F5°C12 mph20 km/h WDrizzle
DateLowHighWindDayNight
March 2840°F4°C54°F12°C6 mph10 km/h from SMostly CloudyRain
March 2939°F4°C48°F9°C9 mph15 km/h from WMostly CloudyPartly Cloudy
March 3037°F3°C56°F13°C4 mph6 km/h from SMostly CloudyMostly Cloudy
March 3145°F7°C63°F17°C9 mph14 km/h from SDrizzleDrizzle
April 146°F8°C61°F16°C8 mph13 km/h from SECloudyRain
April 232°F0°C50°F10°C16 mph26 km/h from WRainPartly Cloudy
April 330°F-1°C46°F8°C10 mph17 km/h from SCloudyDrizzle

Yes

Low of 39°F4°C, High of 48°F9°C
Wind: 9 mph15 km/h
Precipitation: None

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