A chance of further storms across Sydney on Friday evening could provide brief respite on what is shaping up to be a "sticky" day, after a muggy night interspersed with some impressive lightning strikes.

Weatherzone meteorologist, Brett Dutschke​, said the chance of storms later in the day is spread "reasonably evenly across Sydney".

After temperatures of up to 40 degrees in the west, Thursday gave way to a muggy night interrupted only by some impressive lightning. Credit:Nick Moir

"The best chance is in the afternoon to early evening, and it's unlikely to be a lot of thunderstorms – I'd say they'd be quite brief."

If they do hit, the storms could last for about one to two hours, and may affect the western suburbs as early as mid-afternoon.