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If you've been out today, you won't be surprised to hear that it's been the hottest day of the year so far.
It reached 26.3 degrees Celsius in St James's Park - that's nearly 80 in Farenheit.
Great weather for us, but what about the animals at London Zoo?
We sent Martin Stew to find out how they're coping with the heat.
ITV London's weather presenter Martin Stew has reported that London has seen the highest temperatures today:
It's been officially the hottest day of the year so far - 26.1 C degrees in St James Park.
After such a hot afternoon - heavy showers and risk of thunder is expected overnight and tomorrow morning. Met Office has issued a yellow warning for rain.
Here's our weather presenter Martin Stew with the day's forecast for London:
Britain is expected to bask in its hottest days of the year so far today and tomorrow, forecasters said. Temperatures could reach a high of 26 C (78F) today before possibly hitting 30 C (86F) tomorrow.
But high humidity means many areas could see rain and thunderstorms tomorrow morning and evening and sunshine struggling to break through the cloud.
Temperatures should be high across England and Wales, with the South East seeing the highest temperatures, he said.
The welcome warm blast follows what the Met Office said was the coldest spring since 1962, with a mean temperature across March, April and May of 6C (43F), 1.7C below the long-term average.