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(Bloomberg) -- Londoners have been told to prepare for a hosepipe ban as the city faces another heat wave.

Thames Water, the utility that serves London, said it could not confirm exactly when the ban would kick in but urged families to use as little water as they need to get by.

“Given the long-term forecast of dry weather and another forecast of very hot temperatures coming this week we are planning to announce a temporary use ban in the coming weeks,” a spokesperson for Thames Water said.

The UK’s Health Security Agency has issued a heat-health alert for all regions from midday today to 11 p.m. on Aug. 14, while the Met Office has warned of extreme heat particularly in London and southeast England. England registered its driest July in almost 90 years.

South East Water Ltd. is set to impose a hosepipe and sprinkler ban on customers in Kent and Sussex from Aug. 12 until further notice, the company said last week. The restrictions on hosepipes to water gardens, clean cars and fill swimming pools follow similar moves from Southern Water in Hampshire and on the Isle of Wight.

Read More: Searing Temperatures Across Europe Trigger Weather Warnings

Temperatures are expected to reach mid-30 degrees Celsius (95 degrees Fahrenheit) on Friday across South East England, London, the South West, and the East and West Midlands, the UK health agency said. Intense heat in the UK last month sparked fires near London, triggered warnings that railway lines could buckle and forced power stations to operate at low levels to prevent overheating.

(Corrects date in fourth paragraph)