Cardiff, September 12, 2026 – Residents of Cardiff can expect a day of overcast skies and mild temperatures as the city navigates through the early autumn weather. Today, September 12th, will see a high of 20°C and a low of 17°C, with an average temperature of 18.5°C.
the day will be characterized by significant cloud cover, with the condition text describing it as “Overcast.” While the chance of rain is low at 10%.
the persistent cloud cover means sunshine will be scarce While the day is not expected to be wet. This might be a good day for indoor activities or for those who prefer cooler, less sunny weather. The brisk winds could also be a factor for those engaging in outdoor sports or activities that are sensitive to wind conditions.
The maximum temperature is forecast to reach 20°C, while the minimum temperature will be around 17°C. The average temperature for the day is projected to be 18.5°C. A slight chance of rain, at 10%, is present, but significant precipitation is not anticipated. Following today’s overcast conditions, tomorrow, September 13th, is expected to bring light rain, with temperatures remaining similar, a high of 20°C and a low of 18°C. The following day, September 14th, will see a slight increase in temperature, with a high of 22°C and a low of 16°C, under overcast skies.
Given the overcast conditions and the moderate chance of rain, it would be prudent for Cardiff residents to carry an umbrella or a light waterproof jacket if planning to be outdoors for extended periods. The high humidity combined with the wind might make it feel cooler than the actual temperature, so layering clothing could be a wise choice. Looking ahead, the weather in Cardiff is set to see some fluctuations over the next seven days. The week ahead in Cardiff presents a varied weather picture, with a mix of overcast skies, rain, and sunny intervals.
Today, September 12th, Cardiff will experience an overcast sky throughout the day.
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