The Met Office has issued a Level 3 Heatwave Action Heat Health Alert for parts of England, including West Sussex.
That means there is a 90 % probability of Heat-Health Alert criteria being met between midnight on Friday and midnight on Sunday in parts of England.
A statement read:
There is high confidence for temperatures to rise significantly through the second half of this week, becoming hot or very hot in central and southern areas. The peak of the heat is expected on Friday, with daytime maxima likely to reach into the low to mid-30s of Celsius across large parts of central and southern England. Another warm night is expected in similar parts on Friday night before cooler and fresher conditions arrive during Saturday There remains uncertainty in regards to the speed of progression of cooler conditions arriving from the north and west over the weekend. A slower outcome may allow for the very warm or hot conditions to persist across far southern areas on Saturday, before a more definitive return to more seasonable temperatures for all regions of England by Sunday.
An update will be issued when the alert level changes in any region. Alerts are issued once a day by 0900 if required and are not subject to amendment in between standard issue times. Note that the details of the forecast weather are valid at the time of issue but may change over the period that an alert remains in force. These details will not be updated here unless the alert level also changes."