The two factories in question are the central English Solihull and Castle Bromwich plants, and this will affect around 1,000 agency workers.
JLR is the largest auto manufacturer in the United Kingdom, according to BBC News.
"In light of the continuing headwinds impacting the vehicle industry, we are making some adjustments to our production schedules and the level of agency staff", the company said in a statement.
Jaguar Land Rover (JLR) said recruitment of apprentices and engineers in the United Kingdom would continue and that it remained committed to its United Kingdom plants.
The company stressed it remains committed to its United Kingdom plants, having invested more than 4 billion pounds since 2010 to future-proof manufacturing technologies to deliver new models.
Latest employee figures say there are 3,200 people employed at the Castle Bromwich site and a further 10,000 at Solihull.
"Ongoing uncertainty surrounding Brexit is being felt by customers at home and in Europe", the company said in January.
The move comes days after JLR reported a rise in sales over the past 12 months, despite weaker conditions in the United Kingdom and Europe. Following on from a record-breaking 2017, in which the company sold 621,109 cars, Jaguar demand is down 26% in the year-to-date and Land Rover - the group's bigger brand - has lost a fifth of demand in the UK.
'With JLR's United Kingdom production facilities exporting around 75 per cent of its vehicles and importing many parts from the European Union, this action is in part an effort to help mitigate potentially-costly tariffs, which could significantly damage its bottom line. Diesel cars make up around 90 per cent of JLR's production output in the United Kingdom and the company is behind the curve with regards to bringing hybrid and all-electric alternatives to market'.