Yes

you do need a jacket based on the weather in Glasgow, UK 1 second ago

Why? Because it's bitterly cold.
41°F5°C & Partly Cloudy

Wind is 2 mph4 km/h from the E, gusting to 8 mph13 km/h
April 26
8pm41°F5°C3 mph4 km/h EPartly Cloudy
9pm40°F4°C2 mph4 km/h EPartly Cloudy
10pm39°F4°C2 mph3 km/h EPartly Cloudy
11pm38°F3°C2 mph3 km/h EMostly Clear
April 27
12am37°F3°C2 mph4 km/h EMostly Clear
1am36°F2°C3 mph4 km/h EMostly Clear
2am38°F3°C3 mph4 km/h EMostly Clear
3am40°F5°C3 mph5 km/h EMostly Clear
4am43°F6°C4 mph6 km/h EPartly Cloudy
5am46°F8°C5 mph8 km/h EPartly Cloudy
6am49°F9°C5 mph8 km/h EPartly Cloudy
7am51°F10°C5 mph8 km/h EMostly Cloudy
DateLowHighWindDayNight
April 2636°F2°C54°F12°C4 mph7 km/h from EMostly CloudyPartly Cloudy
April 2737°F3°C56°F13°C7 mph11 km/h from NWMostly CloudyPartly Cloudy
April 2840°F5°C56°F13°C11 mph17 km/h from SCloudyDrizzle
April 2947°F8°C63°F17°C11 mph18 km/h from SECloudyMostly Cloudy
April 3048°F9°C56°F13°C12 mph19 km/h from NEDrizzleCloudy
May 149°F9°C57°F14°C8 mph14 km/h from NECloudyMostly Cloudy
May 247°F9°C64°F18°C7 mph12 km/h from EPartly CloudyMostly Clear

Yes

Low of 37°F3°C, High of 56°F14°C
Wind: 7 mph11 km/h
Precipitation: None

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