Weather in Cardiff in July 2025
- July is usually the hottest month of the year in Cardiff;
Average weather
Average temperature in Cardiff in July
Going from a maximum of +25°C during the day to a minimum of +8°C during the night, the temperature in July averages around +20°C.
The average maximum temperature goes down 12% by the end of the month, compared with the beginning of the month, from +20°C to +18°C.
Is Cardiff warm or cold in July?
Cardiff is typically mild in July.
Maximum temperatures go up compared to the previous month from +19°C to +21°C. The minimum temperature also goes up from +12°C to +14°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
July is the hottest month in Cardiff, here is the comparison with other months:
Water temperature in Cardiff in July
Water in Cardiff in July is Cold. It varies from +14°C to +18°C, with an average of +16°C. The air temperature averaging +21°C is higher than the water temperature.
The water temperature in July is one of the warmest of the entire year:
Can you swim in Cardiff in July?
Climate in Cardiff in July
| June | July | August | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +19°C | +21°C | +20°C | ||||
| Min. temperature | ||||||
| +3°C | +6°C | +7°C | ||||
| Max. temperature | ||||||
| +30°C | +34°C | +33°C | ||||
| Rainfall | ||||||
| 74 mm | 74 mm | 85 mm | ||||
| Wind | ||||||
| 4 m/s | 4 m/s | 4 m/s | ||||
| Avg. water temperature | ||||||
| +14°C | +16°C | +17°C | ||||
| Humidity | ||||||
| 77% | 77% | 78% | ||||
| Air pressure | ||||||
| 1015 HPa | 1015 HPa | 1014 HPa | ||||
| Sunny days | ||||||
| 4 | 5 | 3 | ||||
| Cloudy days | ||||||
| 10 | 10 | 10 | ||||
| Rainy days | ||||||
| 15 | 16 | 17 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
July weather is still as ok as in June. It’s getting warmer as July arrives. The average maximum temperature goes up from +19°C to +21°C during the day. The rainfall amount in July stays the same as in the previous month with a 74 mm of total precipitation. Humidity levels don’t change as the month goes on, averaging around 77%. The average wind speed doesn’t change much during July, staying around 4 m/s. The good news is there are likely to be more sunny days in July, from 4 to 5.
August brings much the same weather, it remains ok.
Wind
The average wind speed is 5 m/s getting up to 8 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Cardiff is gradually decreasing during July, going from 8 m/s to 7 m/s over the course of the month.
Rain
How was the weather last July in Cardiff?
Climate Change over Years
The climate in Cardiff in July has not changed much over the last 43 years.
The average temperature was the lowest in 1979 (+12°C) and the highest in 2022 (+16°C). The driest year was 2010 with only 736 mm of rainfall, and the wettest year was 2022 with 1906 mm.
FAQ
Is July a good time to visit Cardiff?
Can you sunbathe in Cardiff in July?
Can you swim in Cardiff in July?
Is Cardiff rainy in July?
Is it sunny in Cardiff in July?
Other cities in United Kingdom
Monthly weather in Cardiff
Source of the data
For this page, we’ve looked at the typical weather in Cardiff, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.