Meghan is supporting her good friend and finalists Serena Williams, while Middleton is the royal patron of the All England Lawn Tennis and Croquet Club, the venue that hosts Wimbledon.
Meghan's previous visit caused controversy after her royal protection officers told spectators not to take pictures of her while watching Williams because she was there "in a private capacity".
Meghan was seen smiling and laughing as she arrived and sat between the two sisters.
Meghan and Williams have become friends over the years, with the 23-time grand slam champion invited to her wedding with Prince Harry.
"Just having her in general as a friend is great. Low moments, high moments, she's always there", Williams said.
For Meghan, the outcome of the match was probably not the one she had been hoping for.
The teenager explained the duchess also asked about the SW19 atmosphere and said her own children want to play tennis.
The cheerful appearance comes despite rumours of a royal rift between the Cambridges and Sussexes, though it is not known if the rumoured tension is between Meghan and Kate.
A spokesman for the Met Office said the duchesses ran the risk of some wet weather.
It made front-page news in The Sun and sparked anger over her churlish attitude towards royal fans. The pair also watched the 2018 Women's Singles final together, so it's possible that this is a budding tradition.
"If something", she added, "The Lion King uses nostalgia as a springboard for experimentation, discovering contemporary ways to yelp mature stories, whereas reminding us what makes those stories feel surely timeless in the most important notify".
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