Cardiff weather forecast: Overcast skies, mild temperatures, and brisk winds today

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. While the chance of rain is low at 10%, the day will be characterized by significant cloud cover, with the condition text describing it as "Overcast."The humidity will be notably high, reaching 94%, which may make the temperatures feel a touch warmer than they are. Wind speeds are also expected to be brisk, with a maximum of 48.28 kph. This combination of factors suggests a day where outdoor activities might be somewhat subdued due to the lack of sunshine and the presence of wind.Cardiff Weather TodayToday, September 12th, Cardiff will experience an overcast sky throughout the day. 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.Humidity levels will be high, sitting at 94%, which could contribute to a feeling of closeness in the air. The wind will be a noticeable factor, with speeds potentially reaching up to 48.28 kph. These conditions indicate a day that is neither particularly warm nor cold, but rather damp and breezy under a blanket of clouds.Prepare for a Cloudy and Breezy DayGiven 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.While the day is not expected to be wet, the persistent cloud cover means sunshine will be scarce. 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.Cardiff Weather for Upcoming 7 DaysLooking ahead, the weather in Cardiff is set to see some fluctuations over the next seven days. 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.The latter half of the week appears to offer a mix of conditions. September 15th and 16th are predicted to have sunny intervals, with temperatures dropping slightly to a high of 20°C and 17°C respectively, and lows of 12°C and 15°C. Towards the end of the week, September 17th and 18th are forecast to bring light showers and sunny intervals, with temperatures hovering around 18°C and 17°C for the highs, and 13°C and 14°C for the lows.DateMax Temp (C)Min Temp (C)Avg Temp (C)Condition2026-09-12201718.5Overcast2026-09-13201819.0Light rain2026-09-14221619.0Overcast2026-09-15201216.0Sunny intervals2026-09-16171516.0Sunny intervals2026-09-17181315.5Light showers2026-09-18171415.5Sunny intervalsThe week ahead in Cardiff presents a varied weather picture, with a mix of overcast skies, rain, and sunny intervals.Source: Data referenced in this article is taken from the latest World News and Live updates. Download the TOI app.