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Live forecasts update automatically; written guidance last reviewed 23 June 2026 by the Aussie Report Weather Desk. Data from the Bureau of Meteorology (BOM) and other national met services via Open-Meteo.
Live data from Open-Meteo · updates automatically ·
Illawong’s weather today, per the live forecast above, reaches the mid-twenties with a light afternoon sea breeze filtering up the Georges River and a shower chance below 20 per cent — a fine late-spring day for this Sutherland Shire suburb.
How does Illawong’s weather compare with nearby suburbs?
Illawong typically registers highs within a degree or two of Sydney weather readings at Observatory Hill, but overnight minima run 1–2 °C cooler because the river flats allow stronger radiational cooling. Compared with Bankstown weather a few kilometres west, Illawong stays slightly milder in summer when the north-easterly sea breeze pushes up the Georges River corridor. The Bureau of Meteorology’s severe weather warning zone for the Sutherland area occasionally includes Illawong during east-coast lows that stall over the Tasman Sea.
What are the key weather risks for Illawong?
Severe thunderstorms develop on roughly 8–10 afternoons each summer, often producing flash flooding in low-lying streets near the river. The illawong weather radar shows the closest high-resolution feed comes from the Sydney (Terrey Hills) radar, which can briefly lose line-of-sight in very heavy rain. Wind gusts above 60 km/h occur during about five frontal passages per year, and the illawong weather hourly breakdown from the Bureau helps residents anticipate the mid-afternoon sea-breeze shift that can double wind speed in 20 minutes.
When should I check the illawong weather radar?
Check the radar 30 minutes before outdoor plans in spring and summer, especially between 1 pm and 5 pm when thunderstorms are most likely over southern Sydney and the Sutherland Shire.
Where can I find the official illawong weather bom forecast?
The Bureau of Meteorology issues the official seven-day forecast for the Sutherland Shire area. Local observations are available from the Holsworthy and Sydney Airport automatic weather stations.
How reliable is the illawong weather hourly forecast?
Same-day hourly temperature forecasts from the Bureau have a typical error of about 1.5 °C, and probability-of-precipitation accuracy sits at 70–80 per cent for the first 24 hours.