Islanders urged to remain vigilant during second heatwave in as many weeks - Jersey Evening Post

by · Jersey Evening Post

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Islanders urged to remain vigilant during second heatwave in as many weeks

by Elen Johnston and James Lewis 7 July 20266 July 2026

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Islanders urged to still remain vigilant during this week's less extreme heatwave Credit: Shutterstock

ANOTHER heatwave is forecast this week – but the Island will not see the record-breaking temperatures of last month.

The heatwave at the end of June saw a daily maximum above 28°C for five consecutive days, including an all-time record high of 39.3°C on 26 June.

Temperatures this week will not be quite as high, but Islanders have been urged to take steps to stay safe during the middle of the day when the mercury is at its highest.

Jersey Met is forecasting highs of 29°C today, rising to 30°C from Wednesday onwards, with the possibility of hitting 34°C by Thursday or Friday.

Senior forecaster Matthew Winter explained: “The definition of a heatwave is 28°C for a period of three days or more, and that condition is certainly being met this week.

“The weather is looking very warm this week, certainly touching the heatwave category this week, but not looking as extreme as the one we had in June.”

However, Mr Winter said it is still necessary to take sun-safety precautions as the UV index is expected to reach seven or eight.

“The UV index is a measure of the strength of the sun, which is how quickly it can burn you,” the forecaster explained. “These values mean it can burn pretty quickly within 15 to 20 minutes without protection if you’re out in the middle part of the day.”

But he added: “The humidity this week is not as high as during the last heatwave. We were seeing what we call the dew temperature reaching between 18 and 20 degrees at that point.

“This week, the dew points will likely be more like 14 or 15, so the air isn’t quite as humid. It’s not holding as much moisture, so it has a slightly less toll on the body.”

It will, however, be difficult for some to sleep towards the end of the week.

“By the time we get to Thursday and Friday night, the temperatures could be well over 18°C to 20°C overnight,” said Mr Winter.

“If they don’t drop below 20, it’s a bit harder for people’s bodies to recover from the daytime. That is what we had last time, these tropical nights, which we have a good chance of seeing again.”

Jersey Coastguard has also issued fresh advice for Islanders taking a dip in the sea to cool off from the heat.

A spokesperson said: “Please remember to check the tide times and wind forecast before heading out.

“If you’re planning to enter the water, choose a lifeguarded beach such as St Brelade, Grève de Lecq, Plémont or St Ouen.

“Although the weather may be warm, the sea can still be cold, so take care when entering the water.

“If you’re spending time along the coast, let someone know your plans and expected return time. If you see anyone in difficulty, call 999 and ask for the Coastguard.”

The government has also reminded Islanders that there is an increased risk of land fires during speels of hot weather.

Those using barbecues are urged to use them “responsibly” and not on balconies, not to light bonfires and to dispose of glass carefully.

Advice from Public Health Jersey

Public Health Jersey urged Islanders to…

  • Stay indoors during the hottest part of the day when the UV levels are highest
  • Take cool baths or showers
  • Drink plenty of water; avoid alcohol or caffeine
  • Keep your home cool; close curtains, use fans and open windows when the outside temperature is cooler than the indoor temperature
  • Wear light, loose clothing and a wide-brimmed hat
  • Apply sun cream (minimum SPF 30) before going outside and reapply regularly
  • If having a BBQ, ensure all food is thoroughly cooked
  • Look out for others

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