Severe Storm Warnings and Flash Flooding Risks: A Soggy Wednesday for Wollongong

Wet Weather Set to Dominate the Illawarra

Wollongong residents are advised to keep their umbrellas and raincoats close at hand as a significant weather system moves across the coast this Wednesday, March 18, 2026. After a relatively humid start to the week, today brings a marked change in conditions, characterized by high rainfall totals and the potential for severe weather events throughout the morning and afternoon hours.

Morning: Thunderstorms and Flash Flooding Alerts

The morning is expected to be the most volatile period of the day. Forecasters have issued a high chance of showers, with a specific warning regarding the potential for severe thunderstorms during the early to mid-morning. These storms may be accompanied by heavy rain, which creates a heightened risk of flash flooding in low-lying urban areas and across the region's main arterial roads. Drivers are urged to exercise extreme caution, especially when navigating known trouble spots such as the Princes Highway and local coastal corridors. The State Emergency Service (SES) reminds the public to never drive, walk, or ride through floodwaters.

Afternoon: Southerly Wind Shift and Cooling Temps

Temperatures today will remain within a narrow, mild range. Wollongong is expected to see a minimum of 20°C, with the mercury only rising slightly to a maximum of 23°C due to the persistent cloud cover and precipitation. By early afternoon, a southerly wind change will move through the region, bringing winds of 15 to 25 km/h. These winds are expected to tend southeasterly at 15 to 20 km/h later in the day, providing a gusty backdrop to the ongoing showers. While the threat of severe lightning may diminish as the afternoon progresses, the rain is likely to remain steady.

Evening: Conditions Expected to Ease

As evening approaches, the intensity of the weather system is predicted to wane. While a high chance of showers remains on the cards, the volume of rainfall is expected to decrease. The southerly winds will gradually lose their strength, becoming light and variable by late tonight. Residents should use this time to clear any debris from gutters and drains, as the ground will be heavily saturated following the morning's downpours.

Today's Weather at a Glance

• Temperature Range: 20°C to 23°C.
• Rainfall: High chance of showers; heavy rain possible in the morning.
• Wind: Southerly 15 to 25 km/h tending southeasterly 15 to 20 km/h in the afternoon.
• Warnings: Severe thunderstorm potential and flash flooding risk for the morning period.