Forecast skill drops rapidly during the first two weeks of a forecast, such that daily conditions generally become unpredictable after about a week or two. This drop in skill varies from one forecast to the next as it is based on the synoptic weather patterns prevalent during the forecast period. At the South African Weather Service we are working on improving the skill of forecasts for the second week and will in future also provide indicators of expected skill of these forecasts. For now please use these forecasts only as a guide to possible events of significance during the second week.


Temperature Distributions
These graphs show a probability distribution of the expected temperature categories during the period of the forecast. This can be used to determine the proportion of hot, warm, cool etc days during the week.


Wind Rose Graphs
Wind roses provide information on the frequency of days where the wind is expected to reach certain thresholds and also the likely direction of the wind. For example: from these graphs one can determine how many days the southeaster will blow in Cape Town and what its probable strength will be.