Last updated: 11 October 2026, 7.29pm BST.
Forecast update: The Met Office table updated at 4pm now shows light showers in Brighton at 10pm and 11pm tonight, with precipitation chances of 70% and 60% respectively. These are hourly forecast periods, not a guarantee that every street will be wet throughout each hour.
Reading the Brighton rain forecast needs more than a rain icon. Ahead of Monday 12 October 2026, when the Met Office expects patchy light rain across London and South East England, understanding the percentage and time period helps residents plan journeys and outdoor work.
The regional forecast updated at 4pm on 11 October expects rain to develop during Monday morning and linger through the day. This is regional guidance, rather than a promise that every Brighton street will be wet at the same moment.
Brighton rain forecast: what does 70% mean?
The Met Office’s forecast-reading guide explains 70% as a seven-in-ten chance of precipitation during the period shown. Precipitation includes rain, drizzle, sleet, snow and hail.
For its hourly table, the event is at least 0.1mm in one hour; for a three-hourly table, at least 0.3mm in three hours. The period begins at the displayed time and runs to the next displayed period. The amount could arrive briefly or over more of that interval.
The percentage is not the intensity
The Met Office’s separate guide to its forecasts advises reading precipitation chance with the weather symbol. A cloudy symbol alongside a small rain chance is not a guarantee of dry weather. The symbol also helps distinguish types and intensity.
Both guides come from the forecaster; they explain how its information works. They are not two independent predictions of Monday’s conditions.
What residents should do
Open the Brighton Met Office page, select the day and read the intervals covering your actual journey. A morning commute and an evening walk can need different decisions even when they share a daily heading.
For a walk towards the Downs, check the relevant destination as well as Brighton. Think about the consequences of getting wet: carrying waterproof clothing is a different decision from cancelling an event. Read any warning separately, including its area and validity period, rather than inferring one from a percentage.
Our Sunday-to-Monday weather report covers the forecast change. This explanation adds a method for interpreting the numbers rather than another thin daily forecast.
Brighton Locals’ view
Editorial judgement: Probability, weather type and time belong together. Turning one percentage into “it will rain all day” loses information that residents can use to make proportionate plans.
What to watch next
Check the forecast’s update time before leaving on Monday. Changed timing, probability or warning information could alter your plan; this evening’s forecast remains a forecast.
Bottom line
Read the place and period first, then use the percentage and symbol together.
Featured image: Editorial illustration by Brighton Locals showing the Met Office’s 70%/30% teaching example. It is not a plotted Brighton observation or an hourly forecast for 12 October.
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