Cardiff weather forecast
UK towns · Wales · 51.48°N 3.18°W
Cardiff, in Wales, has its warmest weather in August, when daytime temperatures average 20.8°C, while January nights are the coldest at around 2.8°C. The town sees roughly 1367mm of rain a year; October is normally the wettest month and June the driest. Figures are averaged from 2020–2024 observations.
Climate averages
| Month | Avg high | Avg low | Rain | Rain days |
|---|---|---|---|---|
| Jan | 8.1° | 2.8° | 117mm | 15 |
| Feb | 9.7° | 4.4° | 144mm | 16 |
| Mar | 10.9° | 4.6° | 113mm | 16 |
| Apr | 13.4° | 5.4° | 77mm | 11 |
| May | 16.7° | 8.9° | 94mm | 13 |
| Jun | 19.7° | 11.6° | 68mm | 12 |
| Jul | 20.5° | 13.2° | 106mm | 17 |
| Aug | 20.8° | 13.7° | 90mm | 16 |
| Sep | 18.9° | 11.9° | 111mm | 12 |
| Oct | 15.2° | 9.8° | 184mm | 21 |
| Nov | 11.5° | 6.2° | 103mm | 15 |
| Dec | 9.1° | 4.6° | 160mm | 18 |
Seasons in Cardiff
Spring (March–May). Daytime highs in Cardiff climb from 10.9°C in March to 16.7°C by May, while nights ease from 4.6°C to 8.9°C. The season brings around 284mm of rain in total.
Summer (June–August). The warmest stretch of the year: afternoons average 20.3°C, peaking in August at 20.8°C. June is usually the driest of the summer months (68mm over ~12 rainy days). Around the June solstice, Cardiff gets roughly 16.4 hours of daylight.
Autumn (September–November). Daytime temperatures fall from 18.9°C in September to 11.5°C by November, and rainfall builds to its annual peak — October is the wettest month of the year (184mm).
Winter (December–February). Nights average 3.9°C, with January the coldest month (average low 2.8°C, daytime high 8.1°C). Expect about 49 days with measurable rain over the three months, and only around 7.6 hours of daylight in mid-December.
How Cardiff compares
| Cardiff | UK town average | |
|---|---|---|
| Annual rainfall | 1367mm | 1054mm |
| Rainy days per year | 182 | 167 |
| Summer daytime high | 20.3°C | 19.7°C |
| Winter night low | 3.9°C | 3.4°C |
Cardiff is about 30% wetter than the average for the 121 UK towns tracked on this site (1054mm), based on 2020–2024 monthly normals.
Cardiff weather FAQs
What is the warmest month in Cardiff?
August is typically the warmest month in Cardiff, with average daytime highs of 20.8°C. Summer afternoons (June–August) average around 20.3°C.
What is the wettest month in Cardiff?
October is usually the wettest month, with around 184mm of rain over roughly 21 rainy days. June is typically the driest (68mm).
How much does it rain in Cardiff per year?
Cardiff receives roughly 1367mm of precipitation per year, spread over about 182 days with at least 1mm of rain (based on 2020–2024 observations).
How cold are winters in Cardiff?
Winter nights (December–February) in Cardiff average around 3.9°C, with January typically the coldest month (average low 2.8°C).
When is the best time to visit Cardiff for good weather?
Late spring and summer offer the most reliable weather in Cardiff. June is typically the driest of the warm months (68mm of rain), while August is the warmest, averaging 20.8°C by day — and near the June solstice there are around 16 hours of daylight to enjoy.
How does Cardiff's weather compare with the rest of the UK?
Cardiff receives 1367mm of rain a year, about 30% wetter than the average for the 121 UK towns tracked on this site (1054mm). Summer daytime highs average 20.3°C against a UK-town average of 19.7°C, and winter nights average 3.9°C versus 3.4°C.
Is it going to rain in Cardiff?
For up-to-the-minute rain tracking, check the live rain radar — as a long-term guide, Cardiff averages 182 rainy days a year, with October the wettest month (184mm) and June the driest (68mm).
What is the 7-day forecast for Cardiff?
See the live hourly and 7-day forecast for day-by-day temperatures and rain chance. The figures on this page are long-term climate averages from 2020–2024, not the live forecast.