The star looked as glamorous as always in the figure-hugging outfit, which highlighted her slender physique.
Lucy accentuated her natural beauty with blusher, smoky eye-shadow and a nude lip plus wore her brunette locks in a wavy style.
As she informed viewers about this week’s weather, Lucy told them to “watch this space” with cold conditions forecast.
She said: “It will be bright and breezy into a new week and temperatures sliding away, a colder theme as the week wears on.”
Lucy continued: “Come Wednesday onwards, temperatures falling away.
“Frost, ice and the chance of some sleet and some snow as the week wears on.”
Lucy added: “So it’s a case of watch this space.”
For today, Lucy said it will be “chillier” than it has been and added “temperatures set to struggle, particularly in the north east”.
Her warning comes after she told her 160,000 Twitter followers on the weekend “colder air incoming”.
Lucy’s followers appreciated her warning with one person writing: “Thanks for the heads up.”
Another commented: “Oh dear Lucy.”
A third wasn’t too fussed about the cold weather and said: “Love it and I work outside all day everyday.”
Lucy has a huge fan-base on social media since launching her career on TV where she began working for the Press Association before she moved to Sky News and eventually ended up delivering the forecast on ITV.
But Lucy admitted the attention she’s received hasn’t all been welcome as she said she gets “weird” requests online.
The Good Morning Britain weather star revealed she’s been asked out multiple times by men after appearing on TV.
Spilling all, she told Stylist magazine: “I tweet a lot at work. I’ve got over 100,000 followers,” adding she is usually predominately quizzed about the weather.
Lucy continued: “I have had men ask me out too.
“It’s weird because people often think they know me because they see me on TV all the time.”
Good Morning Britain airs weekdays on ITV from 6.30am.