September: Warmer than average Forecast issued 01/09/2026 Temperature Above average Precipitation Close to average 1/9 to 7/9 Changeable. In the south dry periods are expected, with relatively small amounts of rain. In central and northern areas significant amounts of rain are likely, and it will be windy at times. Temperatures will often be close to average in the north, but they fluctuate more in the south, where there is potential for very warm days. 8/9 to 14/9 Changeable. Cool and showery conditions are possible across all areas early in the week, and it could also be windy. Later on temperatures trend towards average, and all areas could have rain at times, although the wettest conditions are likely to continue to be in the north and west. 15/9 to 30/9 Mixed over the period as a whole [Forecast confidence is very low] There are indications of high pressure having more influence early on, which could lead to mostly dry weather for a time. Later, the trend is towards a more changeable or unsettled pattern, although the driest and warmest conditions continue to be in the south. Over the second half of the month temperatures are expected to be above average in the south but closer to it in the north. . Important note about long range weather forecasts: It is impossible to say with certainty what the weather will be like more than a few days ahead in the UK. Long range forecasts on TheWeatherOutlook have not been independently verified, and we make no claims for their accuracy. A range of factors including seasonal computer models, recent weather patterns, sea surface temperatures and teleconnections are considered when making the forecasts. How accurate are forecasts for the month ahead? Monthly forecasts offer some skill but vary in reliability depending on several factors: Focus on Trends, Not Specifics Monthly forecasts typically provide information about expected temperature and precipitation trends relative to long-term averages. For example, they might indicate whether a month is likely to be warmer or wetter than usual. Decreasing Accuracy Over Time Monthly weather forecasts have much lower accuracy compared to short-range forecasts, with skill levels generally decreasing sharply after 7 days. They're most useful for identifying broad temperature and precipitation trends relative to seasonal averages rather than specific day-to-day conditions.