Latest weather updates and forecast for Cardiff.
Cardiff, September 16, 2026 – Residents of Cardiff can expect a day of mixed weather, beginning with sunny intervals that may give way to a chance of light rain later in the week. Today, the city will experience a pleasant start with temperatures reaching a high of 18°C. The humidity is expected to be high, around 92%, suggesting a potentially muggy atmosphere despite the sunshine. Today, September 16, 2026, Cardiff will see a maximum temperature of 18°C and a minimum of 14°C, with an average temperature of 16.0°C. Humidity levels are notably high at 92%, which could make the air feel somewhat heavy. The chance of rain today is less than 5%, indicating a very low likelihood of precipitation. Wind speeds are expected to reach up to 38.62 kph, suggesting a breezy day. Tomorrow, September 17, the maximum temperature will remain around 18°C, but the minimum temperature will drop to 9°C, indicating a cooler night. On September 18, the maximum temperature will be 17°C, with a minimum of 16°C, and the condition is expected to be light rain. This trend of light rain continues into September 19, with a high of 19°C and a low of 15°C. By September 20, sunny intervals are predicted to return, with temperatures reaching 20°C and a low of 15°C. The week concludes with overcast conditions on September 21, followed by sunny intervals on September 22, with highs of 20°C and 22°C respectively. As the week progresses, the forecast indicates an increasing chance of rain, particularly from September 18 onwards. The temperature fluctuations between day and night, particularly the drop to 9°C on September 17, also suggest that layering clothing might be a sensible approach for the coming days.
The day will be characterized by a blend of sunshine and cloud cover, with a low chance of precipitation. As the week progresses, however, the possibility of rain increases, particularly towards the middle of the week. The day is set to begin with sunny intervals, offering a bright start for the city. The condition is forecast to be sunny intervals again. This suggests that any outdoor plans for the latter half of the week might need to be flexible. Carrying a light waterproof jacket or an umbrella could become more important as the week unfolds, especially if venturing out during the predicted periods of light rain.
This initial forecast suggests that while today offers a relatively stable weather pattern, individuals should remain aware of potential shifts in conditions as the week unfolds. As we look beyond today, the weather pattern for Cardiff shows some variability.