Climate Chart of Cardiff, Great Britain
Monthly data: Temperature °C, Rain (mm), Sunshine (h) · 2013–2023
For Cardiff, Great Britain, the climate data cover 2013–2023. Monthly mean temperatures range from 5.5 °C in January to 17.4 °C in July, giving a broad indication of the year's temperature pattern without describing daytime highs or individual days. The supplied rainfall and sunshine figures also show that conditions vary across the calendar, while the snowfall record calls for a measured interpretation: daily averages do not establish how often snow falls or whether it settles.
Climate overview
Temperature
The coolest monthly mean is 5.5 °C in January, while the warmest is 17.4 °C in July. These are averages for the month, not daytime maximum temperatures, so they cannot describe the full range a visitor might experience within a day. Across the calendar-month means, the unweighted mean is 11.0 °C; it is not a day-weighted annual average.
Rain
Mean daily rainfall is lowest in April, at 1.98 mm/day, and highest in October, at 4.47 mm/day. The figures describe average daily amounts rather than monthly totals, and they do not show how frequently rain occurs or guarantee dry days in the lower-rainfall month. The unweighted mean across the monthly figures is 3.15 mm/day, also expressed as a daily average.
Sunshine
Average daily sunshine reaches its highest supplied monthly mean in July, at 11.30 hours/day, and its lowest in December, at 3.17 hours/day. These figures describe sunshine duration, not day length, and monthly means cannot guarantee the sunshine on a particular day. The unweighted mean across the calendar-month figures is 7.46 hours/day per day.
Snow
The highest monthly mean daily snowfall is 1.03 mm/day in March. The unweighted mean across the monthly figures is 0.22 mm/day per day. These averages record snowfall amounts, not the number of snowy days, snow depth, lasting cover, or whether conditions are suitable for skiing.
Best Travel Time Guide for Cardiff, Great Britain: Ideal Seasons and Weather Insights
For visitors prioritising lower average rainfall, April is the conditional option in this record, with mean daily rainfall of 1.98 mm/day; it is not a promise of dry weather or a measure of rain frequency. Pack with the highest-rainfall monthly mean in mind too: October records 4.47 mm/day per day, so a rain layer is sensible whatever the trip dates. Those prioritising cooler monthly averages may prefer January, when the monthly mean temperature is 5.5 °C. For outdoor sightseeing planned around average sunshine duration, July has the highest mean at 11.30 hours/day per day, while December has the lowest at 3.17 hours/day. These are separate criteria rather than a single best-time ranking, and averages cannot predict conditions on specific days.
Snowfall averages offer limited guidance for planning: the highest monthly mean daily amount is 1.03 mm/day in March, but that figure does not indicate how many days may see snow or whether snow will remain on the ground. Use it as context rather than as a forecast of snow cover or activity conditions.
Climate Data Overview for Cardiff, Great Britain
Explore the comprehensive climate data for Cardiff, Great Britain. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes, helping you understand the unique weather patterns of this region.
| Month | Average: Temperature °C | Rain (mm) / day | Snow (mm) / day | Sunshine (h) / day |
|---|---|---|---|---|
| Jan | 5.5 | 3.42 | 0.86 | 3.67 |
| Feb | 5.8 | 3.42 | 0.28 | 5.23 |
| Mar | 6.8 | 2.94 | 1.03 | 6.77 |
| Apr | 9.1 | 1.98 | 0.10 | 9.42 |
| May | 12.3 | 2.63 | 0.00 | 10.67 |
| Jun | 15.5 | 2.19 | 0.00 | 11.17 |
| Jul | 17.4 | 2.45 | 0.00 | 11.30 |
| Aug | 16.6 | 3.35 | 0.00 | 9.82 |
| Sep | 15.0 | 2.78 | 0.00 | 8.13 |
| Oct | 12.2 | 4.47 | 0.00 | 5.90 |
| Nov | 8.5 | 3.67 | 0.10 | 4.21 |
| Dec | 7.1 | 4.46 | 0.26 | 3.17 |
| Average | 11.0 | 3.15 | 0.22 | 7.46 |
