Cardiff, United Kingdom Weather
Cardiff hourly forecast: next 24 hours
Today's high of 62°F (17°C) is right in line with the typical September high of 64°F (18°C).
Current conditions in detail
Cardiff weather tomorrow (Thursday, September 17)
Tomorrow in Cardiff looks patchy rain nearby, with a high of 63° and an overnight low of 51°. There is a 65% chance of rain - plan accordingly. Winds top out near 20 mph, and the UV index reaches 4 (moderate).
Cardiff 14-day forecast
About the weather in Cardiff
Cardiff has an oceanic climate. Average highs run from 46°F (8°C) in January to 69°F (20°C) in July, and the city records roughly 171 days of measurable precipitation a year.
Cardiff weather: quick facts
- Hottest month: July - highs near 69°F (20°C)
- Coldest month: January - highs near 46°F (8°C)
- Decade extremes (2015-2024): 91°F (33°C) high · 22°F (-6°C) low
- Wettest month: December (17 rainy days) · Sunniest: June (11.7 h sun/day)
- Climate type: oceanic
- Annual swing: 12°C between the average warmest and coolest month · day to night: 6°C
- Snow: about 2 days a year
- Average humidity: 82%
Temperatures through the year
Snowfall is rare but not unheard of. January sits at the other end of the year: 46°F (8°C) by day, 37°F (3°C) at night. Warmth peaks in July: highs of 69°F (20°C), lows of 56°F (13°C). The wettest month is December (5.6 inches (143 mm) across 17 days) and the driest June.
Rain, sun and snow
Days and nights are about 6°C apart on average - narrower than all but 10% of the 3496 cities in our dataset. Sunshine averages 7.7 hours a day over the year - duller than about 89% of the cities we track, peaking in June at 11.7 hours. Relative humidity averages 82% across the year, more humid than 92% of the 3496 cities in our dataset. The gridded 2015-2024 daily record for this location tops out at 91°F (33°C) and bottoms at 22°F (-6°C) - decade extremes, not all-time station records.
Season by season
Spring (March through May)
Through spring, Cardiff stays on the cool side of mild: 55°F (13°C) by day, 43°F (6°C) after dark, and rain falls on around 39 of the 90 days.
Summer (June through August)
Summer in Cardiff stays on the cool side of mild, with daytime highs averaging 67°F (20°C) and nights around 55°F (13°C); rain falls on around 42 of the 90 days. Daylight is generous - around 11.0 hours of sun a day.
Fall (September through November)
Fall in Cardiff is crisp but comfortable, with daytime highs averaging 58°F (14°C) and nights around 48°F (9°C); rain falls on around 44 of the 90 days.
Winter (December through February)
Through winter, Cardiff is brisk and cold: 47°F (9°C) by day, 38°F (4°C) after dark, and rain falls on around 46 of the 90 days.
Average temperatures in Cardiff by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 46° | 37° | 15 | 4.0 in | 4.1 h/day | 87% |
| February | 48° | 38° | 14 | 4.2 in | 5.3 h/day | 84% |
| March | 50° | 39° | 16 | 4.2 in | 6.9 h/day | 81% |
| April | 55° | 41° | 11 | 2.6 in | 9.8 h/day | 76% |
| May | 61° | 47° | 12 | 3.3 in | 11.1 h/day | 77% |
| June | 66° | 53° | 12 | 2.6 in | 11.7 h/day | 76% |
| July | 69° | 56° | 15 | 3.4 in | 11.4 h/day | 77% |
| August | 68° | 56° | 15 | 4.0 in | 10.0 h/day | 80% |
| September | 64° | 53° | 13 | 4.1 in | 8.5 h/day | 82% |
| October | 58° | 48° | 16 | 5.4 in | 6.3 h/day | 84% |
| November | 51° | 43° | 15 | 4.4 in | 4.4 h/day | 87% |
| December | 49° | 41° | 17 | 5.6 in | 3.3 h/day | 89% |