The errors of PSR forecast in the next one to six days are within around 10% and those in seven to nine days are within around 20%. For forecast elements in "9-day Weather Forecast" other than PSR, the average accuracy for the next one to three days, four to seven days, and eight to nine days are about 90%, 85% and 80% respectively. The accuracy of forecast generally decreases while the error generally increases with forecast period.There are 5 categories of probability as follows:įor every 100 forecasts with a "high" probability, there are about 70 times or more with an average accumulated rainfall of 10 mm or above in actual observation.įor every 100 forecasts with a "medium high" probability, there are about 55 to 69 times with an average accumulated rainfall of 10 mm or above in actual observation.įor every 100 forecasts with a "medium" probability, there are about 45 to 54 times with an average accumulated rainfall of 10 mm or above in actual observation.įor every 100 forecasts with a "medium low" probability, there are about 30 to 44 times with an average accumulated rainfall of 10 mm or above in actual observation.įor every 100 forecasts with a "low" probability, there are about less than 30 times with an average accumulated rainfall of 10 mm or above in actual observation. around the mean daily rainfall in rainy season) or more on that day. The PSR forecast on each day indicates the probability of the accumulated rainfall generally over Hong Kong reaching 10 mm (i.e. The Probability of Significant Rain (PSR) forecast provides users with additional reference on rainfall amount and forecast trend for the coming 9 days.For detailed description of today's weather forecast, please refer to " Local Weather Forecast". "9-day Weather Forecast" provides general indications of the trends in weather for the coming 9 days.This middle 50% range (between 25th and 75th percentiles) is calculated based on the maximum/minimum temperature and relative humidity data within a 5-day period centred on that day in the 30 years from 1991 to 2020. ![]() These clear to leave the day dry with sunny spells although strong winds and rain may sweep into the west later. Some sunny spells and a risk of some fog patches. Highs at 8 to 11C.Ī ridge of high pressure gives a dry start to Saturday morning. The showers heavy at times in the west and south, fewer of them in the east. Rain may affect northern and eastern Scotland. This brings heavy showers and some bright or sunny spells. Temperatures at 8 to 12C.Īn area of low pressure passing through Ireland on Thursday. Brighter weather for most other areas, although always a risk of some showers. Some heavy showers across central and southern England as well, these clearing slowly eastwards. Low pressure close to northern Scotland on Wednesday brings heavy periods of rain here. ![]() Becoming brighter again from the west later. The rain will be heavy at times, and it will be affecting many western parts of the country throughout the morning. ![]() ![]() Breezy in central and eastern areas in the morning but mostly dry here until rain arrives from the west later in the morning and through the afternoon. Highs at a cooler 11C in the west, 14C in the east.Ī cooler day for all on Tuesday. Turning drier across Wales, Southwest England and Ireland in the afternoon and brighter here too. The drizzle and rain will edge eastwards through the afternoon with many areas becoming misty and murky. Wetter across western parts with some heavy bursts of rain and misty conditions over hills and coasts. There will be sunny spells and it should be dry here, although there could be some morning mist and fog patches which will soon clear. There will be showers, some of them heavy and it will be windy at times too.įor the weather for the next few days click hereĪ bright and dry start across eastern areas on Monday. A sharp temperature change next week as cooler, more unsettled winds arrive from the west. Some drizzle or outbreaks of rain in the west, but sunny spells for many. A very mild weekend, then cooler and unsettled next weekĪ very mild weekend with mostly dry weather.
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