Cardiff Weather in July

During July, Cardiff experiences pleasant daytime temperatures of 20°C (68°F) and cooler nights around 14°C (57°F). As part of the summer season, expect quite a bit of rainfall. Around 85 mm (3.3 in) is typical.

Rainfall in Cardiff in July

Based on our climate data of the past 30 years, about 13 days of rain are anticipated, with 85 mm (3.3 in) on average. Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.

Temperature in Cardiff in July

July is one of the better months to visit Cardiff. Expect 20°C (68°F) during the day and 14°C (57°F) at night. During July, you'll experience the summer season. Conditions are often most pleasant around the middle of the day. With overnight lows of 14°C (57°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Cardiff in July

The city usually sees around 202 hours of sunlight, indicating many sunny days — a great month for sightseeing.

Wind Speed in Cardiff in July

July sees wind speeds averaging 4 m/s (8 knots). You'll experience variable conditions with moderate winds that create small waves on water and keep branches moving. Conditions range from light winds to moderate breezes throughout the month.

Average water temperature in July

The water temperature is 15°C (59°F) — chilly, but perfectly fine for a swim if you're not too sensitive to cold water. A short wetsuit can make longer sessions more comfortable.

So this is a great month to visit if you prefer dry days with pleasant temperatures.

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Check the conditions for any month of the year.

• January
• February
• March
• April

• May
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• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United Kingdom, check out our Cardiff's climate page.

Cardiff Temperature in July

Min Temperature 14°C (57°F)  

Max Temperature 20°C (68°F)  

Water Temperature 15°C (59°F)  

Chance of Rain 43%  

Precipitation 85 mm (3.3 in)  

Rainy days 13 days  

Humidity 76%  

Windspeed 4 m/s (8 knots)  

Sunshine 202 hours  

Percentage Sunshine 38%  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Cardiff typically stay consistent throughout July, with daily highs averaging around 20°C (68°F). Nights are cool, with lows around 13°C (55°F).

Average temperatures in July

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Daily Historical Precipitation

50-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in July

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Historical weather for Cardiff in July

Browse day-by-day weather records for Cardiff spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Cardiff historical weather extremes in July

Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Cardiff.

• Cardiff recorded its highest July temperature of 32°C (90°F) on July 18, 2022.
• Cardiff experienced its chilliest July day on July 8, 1978, reaching only 13°C (55°F).
• The coldest night in July in Cardiff was on July 7, 1996, with a minimum of 6°C (43°F).
• The heaviest July precipitation occurred on July 17, 2003, when 54 mm (2.1 in) of precipitation fell.

What to Wear in Cardiff in July

Comfortable temperatures call for an easy wardrobe in July. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. The water temperature sits at about 15°C (59°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Cardiff in July

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Cycling

9/10

Walking

9/10

Barbeque

8/10

Camping

8/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United Kingdom, check out our Cardiff's climate page.

More climate data for Cardiff

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Cardiff climate overview or explore weather in the United Kingdom.