The fire is at Saddleworth Moor - an area which saw another fire last night which was extinguished shortly after.
According to the Huddersfield Examiner, the grass caught light again this morning due to strong winds and high temperatures.
Smoke can be seen for miles away.
Firefighters are said to have been hindered by the remoteness of the blaze and have had to battle the fire for most of the day.
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Meanwhile, West Midlands Fire service has sent six fire engines to the scene of a large fire near Sutton Coldfield.
The blaze is thought to have broken out on Holly Lane, which is in Wishaw, Sutton Coldfield.
Some social media users are claiming a tractor is on fire, although this has not yet been confirmed.
The news comes as Britain's two-week heatwave begins today, sparking Government alerts for dangerous weather.
Warnings include water shortages and the threat of melting pavements.
The weather phenomenon has been caused by a plume of hot air from Africa.
Temperatures could soar to over 90F this week.
More to follow...