After a work project sent him to Vietnam, Del met and married a fellow engineer. Settling in Saigon, he launched Saigon Weather to share hyper‑local forecasts of wind speed, wind direction and expected rainfall for the city.

Del explains that Saigon experiences three monsoon periods: the southwest monsoon from May to October, the northeast monsoon from November to April, and an occasional southeast monsoon that brings brief mid‑morning showers. He also notes that typhoons cannot reach the city because tropical cyclones cannot cross the equator.

Global weather models are built for temperate regions and often miss local quirks. To improve accuracy, Del supplements these models with data from weather stations in Brunei, Singapore, Fiji and Hong Kong, allowing him to produce more precise, neighbourhood‑level predictions.

Saigon residents use his forecasts for everyday decisions – whether to hang laundry, carry an umbrella, or plan a night out. Local groups such as an astronomy club and several cricket clubs also rely on his updates to choose clear evenings or safe playing times.

By turning his mathematical training, sailing experience and love of data into a community service, Del provides a reliable alternative to generic phone apps, helping people stay dry and safe during the city’s rainy season.