Yes

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

Why? Because too cold for just a hoodie, too warm for a parka and it's on the windy side!
48°F9°C & Mostly Cloudy

Wind is 11 mph17 km/h from the Northeast, gusting to 25 mph40 km/h
May 10
11am48°F9°C11 mph17 km/h NortheastMostly Cloudy
12pm46°F8°C10 mph15 km/h NorthPartly Cloudy
1pm45°F7°C8 mph13 km/h NorthPartly Cloudy
2pm44°F6°C6 mph10 km/h NorthPartly Cloudy
3pm42°F6°C6 mph10 km/h NorthPartly Cloudy
4pm41°F5°C6 mph9 km/h NorthPartly Cloudy
5pm40°F4°C6 mph10 km/h NorthPartly Cloudy
6pm39°F4°C6 mph10 km/h NorthMostly Cloudy
7pm38°F3°C7 mph11 km/h NorthMostly Cloudy
8pm37°F3°C7 mph11 km/h NorthPartly Cloudy
9pm36°F2°C7 mph12 km/h NorthPartly Cloudy
10pm35°F2°C7 mph12 km/h NorthPartly Cloudy
DateLowHighWindDayNight
May 937°F3°C50°F10°C10 mph16 km/h from NorthPartly CloudyPartly Cloudy
May 1035°F2°C51°F11°C11 mph17 km/h from NorthMostly CloudyMostly Clear
May 1138°F3°C53°F11°C8 mph13 km/h from NorthMostly ClearMostly Cloudy
May 1241°F5°C56°F13°C6 mph9 km/h from NorthPartly CloudyMostly Clear
May 1340°F5°C53°F12°C7 mph11 km/h from NorthwestDrizzleDrizzle
May 1439°F4°C53°F12°C5 mph9 km/h from NorthwestMostly CloudyPartly Cloudy
May 1542°F6°C58°F14°C6 mph10 km/h from NortheastMostly CloudyPartly Cloudy

Yes

Low of 35°F2°C, High of 51°F11°C
Wind: 11 mph17 km/h
Precipitation: 20% rain

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