Latest weather updates and forecast for Cardiff.
Cardiff, September 17, 2026 – Residents of Cardiff can expect a day of mixed weather, beginning with sunny intervals and a high chance of rain. The day will be marked by mild temperatures, with a significant chance of precipitation throughout.
Source: Data referenced in this article is taken from https://www.metoffice.gov.uk
Today, September 17, 2026, Cardiff will experience sunny intervals, but this is accompanied by a substantial 95% chance of rain. The maximum temperature is forecast to reach 18°C, while the minimum temperature will be around 10°C, resulting in an average temperature of 14.0°C. Humidity levels are expected to be high, reaching 96%. Wind speeds could reach up to 49.89 kph, adding a brisk element to the day. Following today’s unsettled conditions, tomorrow, September 18th, will see cloudy skies with an average temperature of 17.0°C. The following day, September 19th, is expected to bring light rain, with a high of 19°C and a low of 13°C. The warmest day appears to be September 21st, reaching a high of 21°C.
The weather in Cardiff is set to see a variety of conditions over the next seven days, with a mix of cloudy spells, light rain, and sunny intervals. Temperatures are expected to remain relatively mild throughout the period. The latter half of the week shows a return to more mixed conditions, with sunny intervals and overcast skies predicted.