The temperature reached 91 degrees at District of Columbia's National Airport at 2:59 p.m., tying a heat record for April 29 in the district set in 1974 - which only amplified the movement's message.
The climate event differed from last week's March for Science in its focus and also its participants - only 1 out of 8 contingents at Saturday's protest had scientific researchers.
People gathered on the Boston Common carried signs with slogans such as "Dump Trump".
During his campaign to become president, Trump called climate change a hoax.
On Friday, the day before the Climate March to protest the Trump administration's rollbacks of former president Obama's climate change policies, the Environmental Protection Agency issued a statement announcing that its website would be "undergoing changes" to better represent the new direction the agency.
Since Trump's inauguration on January 20, there have been national protests focused on issues ranging from abortion rights to immigration and science policy.
The march began on Capitol Hill and made its way along Pennsylvania Avenue to the White House - demonstrators protesting Trump administration environmental policies. Sister-marches took place in more than 300 locations worldwide.
Organizers said over 150,000 people have joined the event in the USA capital, a number far exceeding their expectations, as the National Park Service granted a permit only for 100,000 people.
Others chanted "we will not go away, welcome to your 100th day" and "keep it in the soil, we can't drink oil".
Almost a dozen speakers, including a nurse affected by Hurricane Sandy, an indigenous community leader from the Gulf Coast and a student activist from Las Vegas, spoke about the impact that climate change and pollution were already having on their lives, calling for a clean economy that leaves no one behind.
About one and a half hours later, when the march fully surrounded the White House, some of the protestors sat down for 100 seconds to symbolize the first 100 days of the Trump administration.
Thousands of protesters have been preparing to march on Washington to protest the Trump administration stance on climate and environmental protection.
"Hang on EPA, the midterms are coming".
Both Green GW and Fossil Free GW led a group of around 40 students to the demonstration and marched together through the streets of the District.
Carol Browner, who served as EPA administrator from 1993 to 2001 says that while there was once a bipartisan agreement that protecting the environment was important, "those days may be over".
In its press statement, the EPA said that when it comes to website changes, "the first page to be updated is a page reflecting President Trump's Executive Order on Energy Independence, which calls for a review of the so-called Clean Power Plan".