Environmental Days In September 2025
Image Credit: NASA
This September there are awareness days for primates, gorillas, dolphins and red pandas as well as days to campaign for clean air and save the rainforest.
The key environmental dates, awareness days, weeks, months and environmental events in September 2025.
Secondhand September
Date:1st - 30th September
Secondhand September is a campaign run by the charity Oxfam, to encourage us to shop secondhand in September to take a stance against fast fashion and dress for a fairer world.
Donate your unwanted clothes and pledge to buy secondhand for the month, while discovering slow, sustainable fashion.
International Primate Day
Date: 1st September
International Primate Day is an annual educational observance event to highlight the issues of and campaign for the humane treatment of all great apes including chimpanzees, gorillas and orangutans.
Amazon Rainforest Day
Date: 5th September
Amazon Rainforest Day is celebrated mainly in Brazil. It celebrates one of humanity’s most precious natural heritages which is under serious threat from predatory human activities such as logging, mining, infrastructure construction and the conversion of standing forest into areas of pasture or cropland.
Plastic Overshoot Day
Date: Early September
Plastic Overshoot Day represents the day when the volume of plastic waste will overshoot the volume that waste systems on planet Earth can manage.
In 2024 it fell on 5th September.
International Day of Clean Air for Blue Skies
Date: 7th September
International Day of Clean Air for blue skies is a UN recognised day to raise awareness of the importance of clean air to our health, as air pollution is the single greatest environmental risk to human health and one of the main avoidable causes of death and disease globally.
World Dolphin Day
Date: 12th September
World Dolphin Day is a new commemorative day which marks the largest single slaughter of cetaceans in recorded history when 1428 dolphins killed in the Faroe Islands.
International Day for the Preservation of the Ozone Layer
Date: 16th September
The International Day for the Preservation of the Ozone Layer is a UN recognised day which marks the signing of the Montreal Protocol, which ended one of the biggest threats ever to face humanity as a whole: the depletion of the ozone layer.
International Red Panda Day
Date: 20th September 2025
International Red Panda Day is held on the third Saturday of September every year. Red pandas are native to the eastern Himalayas and southwestern China. It is an endangered species, mainly due to loss of habitat.
World Manta Day
Date: 17th September
World Manta Day is a special day which has been created to celebrate manta rays and to raise awareness of the threats that these beautiful, mysterious, ocean giants face.
Zero Emissions Day
Date: 21st September
Zero Emmissions Day recognises the need for immediate and deep emission reductions across all sectors for limiting the global warming to 1.5°C. Zero Emissions Day has been designed to give the world a break from fossil fuels and to raise awareness about the harm caused by carbon emissions.
World Car Free Day
Date: 22nd September
World Car Free Day encourages us all to leave the car at home allow people to experience streets free of motor traffic. Organised by the World Car Free Network it aims to show the world what it would be like if it was to be traffic-free for just one day.
World Rhino Day
Date: 22nd September
World Rhino Day is a day to celebrate the five species of rhino, the white rhino, black rhino, greater one-horned rhino, sumatran rhino and javan rhino. All rhino species are under threat of extinction, and one – the Sumatran rhino – is on the verge of disappearing.
Recycle Week
Date: 22nd to 28th September 2025
Recycle Week is an annual recycling campaign in the UK, which is a celebration of recycling across the nation, galvanising the public to recycling more of the right things, more often.
World Gorilla Day
Date: 24th September
World Gorilla Day is a day to come together in celebrating gorillas, and more importantly, taking action to protect gorillas in the wild.
The International Day of Awareness of Food Loss and Waste
Date: 29th September
The International Day of Awareness of Food Loss and Waste is a UN recognised day to raise awareness of the tons and tons of edible food that are lost and/or wasted every day.
More key environmental dates
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