If you plan to visit Cardiff in August, the weather is typically alright, with an average high temperature of +20°C during the day and approximately 3 sunny days. Expect some rainy, though, as there are typically 17 rainy days in the month and around 85 mm of precipitation. The weather is changeable so you may have to pack for every eventuality. Search flightsin one click on Avionero.
Average weather
☀️
+20°C
Avg. max. temperature
+7°C
Min.
+33°C
Max.
85 mm
Total precipitation
78%
Avg. humidity
4 m/s
Avg. wind
3 ☀️
Sunny Days
10 ⛅️
Cloudy
17 🌦
Rainy
Our opinion: Cardiff has OK weather in August.
Average temperature in Cardiff in August
Here are the expected maximum, average and minimum temperatures in Cardiff for August based on the historical data.
Last Year
Historical Data
Going from a maximum of +25°C during the day to a minimum of +9°C during the night, the temperature in August averages around +20°C.
The average maximum temperature goes down 25% by the end of the month, compared with the beginning of the month, from +20°C to +16°C.
Is Cardiff warm or cold in August?
Cardiff is typically mild in August.
Maximum temperatures go down compared to the previous month from +21°C to +20°C. The minimum temperature also goes up from +14°C to +14°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
August is one of the warmest months in Cardiff, here is the comparison with other months:
Water temperature in Cardiff in August
Water in Cardiff in August is Fresh. It varies from +16°C to +18°C, with an average of +17°C.This is almost similar to the air temperature, which averages +20°C.
The water temperature in August is one of the warmest of the entire year:
The warmest water temperatures in Cardiff are reached in August, when the average sea temperature rises to +17°C. The coldest water temperatures are in March, with an average of +8°C.
Can you swim in Cardiff in August?
Water temperature (+17°C) in Cardiff in August might be suited for short swims and acclimatized swimmers might find it refreshing.
🦭
Cold
Below +16°C
🏄♂️
Fresh
16°C - 21°C
🏊
Comfortable
21°C - 25°C
👙
Warm
25°C - 28°C
🔥
Very warm
+28°C and up
Think of bringing a full-body or shorty wetsuit (3mm-5mm thickness) to provide insulation and maintain body heat.
Climate in Cardiff in August
Cardiff weather looks like this, on average, in August and the surrounding months.
July
August
September
Avg. temperature
+21°C
+20°C
+18°C
Min. temperature
+6°C
+7°C
+4°C
Max. temperature
+34°C
+33°C
+29°C
Rainfall
74 mm
85 mm
84 mm
Wind
4 m/s
4 m/s
4 m/s
Avg. water temperature
+16°C
+17°C
+17°C
Humidity
77%
78%
79%
Air pressure
1015 HPa
1014 HPa
1015 HPa
Sunny days
5
3
3
Cloudy days
10
10
10
Rainy days
16
17
17
Snowy days
0
0
0
August weather is still as ok as in July.It’s getting colder in August. From +21°C in the day, the average maximum temperature lowers to +20°C.Prepare for more rain. Average rainfall goes from 74 mm to 85 mm.Humidity rises from 77% to 78%.The average wind speed doesn’t change much during August, staying around 4 m/s.The days becoming less sunny, going from 5 sunny days in July to 3 in August.
September brings much the same weather, it remains ok.
Wind speed in Cardiff in August based on historical data.
Last Year
Historical Data
The average wind speed is 4 m/s getting up to 6 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 August, going from 5 m/s to 2 m/s over the course of the month.
Rain
Amount of rainfall in mm during August in Cardiff based on historical data.
Last Year
Historical Data
Typically, there is a 65% chance of rain on an average day in August, with total rainfall of approximately 123 mm. The maximum amount of rainfall per day is around 17 mm, which is considered light rain.August is a pretty wet month with over 20 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of galoshes.
Here’s how August is compared with other months in the amount of precipitation, total mm:
Cardiff wettest month is October, where a typical day has a 65% chance of precipitation and 119 mm of rainfall per day. April, on the other hand, is the driest month with a mere 50% chance of precipitation and 63 mm of rainfall per day.
How was the weather last August in Cardiff?
This is the weather in Cardiff in August 2023:
1 August
🌧️
+20°C
2 August
🌧️
+19°C
3 August
☀️
+20°C
4 August
☁️
+19°C
5 August
🌧️
+20°C
6 August
☀️
+20°C
7 August
☀️
+18°C
8 August
🌧️
+18°C
9 August
☁️
+24°C
10 August
☁️
+25°C
11 August
🌧️
+23°C
12 August
🌧️
+19°C
13 August
🌧️
+19°C
14 August
🌧️
+19°C
15 August
☁️
+22°C
16 August
☁️
+24°C
17 August
☁️
+23°C
18 August
🌧️
+20°C
19 August
🌧️
+22°C
20 August
☁️
+22°C
21 August
☁️
+22°C
22 August
☁️
+21°C
23 August
☁️
+24°C
24 August
☁️
+22°C
25 August
🌧️
+17°C
26 August
🌧️
+18°C
27 August
☁️
+18°C
28 August
☁️
+18°C
29 August
☁️
+18°C
30 August
☁️
+18°C
31 August
🌧️
+16°C
In August 2023 Cardiff had 3 sunny days, 15 cloudy days, and 13 rainy days. The average maximum temperature was +20°C, with an absolute maximum of +25°C and a minimum of +16°C. The average humidity was 84%, with a maximum of 98% and a minimum of 59%. The average wind speed was 4 m/s, with a maximum of 10 m/s and a minimum of 0 m/s.
Are you planning a trip in August?
Climate Change over Years
This is how Cardiff climate have been changing during last 43 years period.
The climate in Cardiff in August 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
Frequently asked questions about the weather in Cardiff in August:
Is August a good time to visit Cardiff?
It’s always a good time to visit Cardiff, but the weather is changeable in August, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in Cardiff in August?
August has mild temperatures in Cardiff. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!
Can you swim in Cardiff in August?
In general, you can swim in Cardiff in August, if you want to, at an average water temperature of +17°C. But it will feel quite cool, and some precautions are necessary to ensure your comfort and safety.
Is Cardiff rainy in August?
Cardiff is often rainy in August. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Cardiff in August?
Usually, it’s not very sunny in Cardiff in August, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
Other cities in United Kingdom
Check out the weather for other cities in United Kingdom.
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.
