The easing of lockdown in July saw a 64% increase in the number of recreational water users aided by the charity compared to last year.
Chiswick lifeboat station remains the second busiest in the UK only behind Tower.
The RNLI has spent £1.2 million on PPE, including almost 700,000 face masks, 2.4 million gloves and 4,700 litres of hand sanitiser.