Sydney is at risk of seeing thunderstorms this weekend, possibly impacting on sporting fixtures. On Friday, thunderstorms are a chance in western Sydney, possibly impacting Penrith or Richmond. There is only a low chance of a shower moving over ANZ Stadium for the Wests Tigers v Rabbitohs game this evening with a nice evening ahead. On the weekend the storm risk increases. On Saturday thunderstorms are likely to affect parts of western Sydney, with a fair chance of one affecting Penrith for the late afternoon Penrith v Bulldogs match. There is only a low chance of storms reaching Parramatta where the State Championships for Royal Life Saving is being held in an outdoor pool this weekend. The Newcastle Jets v Wellington Phoenix match in Newcastle also faces a storm risk. On Saturday evening, storms become only a low risk, meaning the Major League Baseball's opening game at the SCG should go on without interruption. However the afternoon game on Sunday may not be so fortunate. Thunderstorms are a slightly higher risk on Sunday, with all of Sydney at risk of seeing a thunderstorm move through as the approaching low pressure trough provides extra uplift. Spectators going to any match on Sunday afternoon or evening would be wise to take an umbrella, just in case a shower or thunderstorm moves through. As always with showers and storms, nowhere is guaranteed to see thunderstorms, but if one does arrive it could produce a heavy burst of rain. By Monday morning the trough will have moved through, reducing the thunderstorm risk. However, showers become more likely due to moist southeasterly winds. These will bring cloud and the risk of showers each day until late next week, with the most showers nearer the coast. This change in the weather is the start of typical autumnal weather in the Harbour City.