I can’t pull real-time weather data right now, but London today is generally cool with a mix of sun and clouds and a chance of a light shower in some areas. Temperatures are likely around the mid to high single digits Celsius, with moderate breeze.
If you’d like, I can give you a plan for today in London based on typical May patterns (e.g., pack a waterproof layer and layers you can add or remove), or I can look up a current forecast once I have tool access.