Car bombs and attacks on cities across Iraq killed at least 20 people and wounded more than 200, officials said.
The wave of attacks in Baghdad, Kirkuk, Nassiriya, Tuz Khurmato and other towns, came days before Iraqis vote in provincial elections.
More top news
After the heatwave come the storms, with lightning flashes illuminating the night sky across much of the country last night.
An Independence Day event at a UK base has been cancelled by the US Air Force over security fears.
British firms predict the economy should sustain a "solid" pace of growth for the rest of the year thanks to lower oil prices and inflation.