Cardiff weather forecast: Sunny intervals today, rain expected later in the week

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.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. 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.Cardiff Weather TodayToday, 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. The day is set to begin with sunny intervals, offering a bright start for the city. 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.As we look beyond today, the weather pattern for Cardiff shows some variability. Tomorrow, September 17, the maximum temperature will remain around 18°C, but the minimum temperature will drop to 9°C, indicating a cooler night. The condition is forecast to be sunny intervals again. 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.Prepare for a day of variable conditionsGiven today's forecast of sunny intervals and high humidity, residents can anticipate a generally pleasant but potentially close atmosphere. The low chance of rain means that umbrellas are unlikely to be needed for most of the day, but it would be prudent to keep an eye on the sky for any unexpected changes. The breezy conditions with winds up to 38.62 kph might offer some relief from the humidity. For those planning outdoor activities, the moderate temperatures should be comfortable, but the high humidity might make it feel warmer than it is.As the week progresses, the forecast indicates an increasing chance of rain, particularly from September 18 onwards. 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. 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.Cardiff Weather for Upcoming 7 DaysThe weather in Cardiff over the next seven days presents a mixed picture, starting with sunny intervals today and a chance of light rain later in the week. Today, September 16, will see a high of 18°C and a low of 14°C with sunny intervals. Tomorrow, September 17, temperatures will range from 9°C to 18°C, also with sunny intervals. A shift towards wetter conditions is expected on September 18, with a high of 17°C and a low of 16°C, under light rain. This pattern of light rain is forecast to continue on September 19, with temperatures between 15°C and 19°C. By September 20, sunny intervals are predicted to return, with a high of 20°C and a low of 15°C. The week will end with overcast skies on September 21, followed by sunny intervals on September 22, with highs of 20°C and 22°C respectively.DateMax Temp (C)Min Temp (C)Condition2026-09-161814Sunny intervals2026-09-17189Sunny intervals2026-09-181716Light rain2026-09-191915Light rain2026-09-202015Sunny intervals2026-09-212016Overcast2026-09-222213Sunny intervalsThe coming days in Cardiff will see a mix of sunshine and increasing chances of rain, with temperatures remaining relatively mild.Source: Data referenced in this article is taken from the latest World News and Live updates. Download the TOI app.