Cardiff Weather in March

Thinking of visiting Cardiff in March? Expect low temperatures reaching 11°C (52°F) during the day, dropping to 5°C (41°F) at night, with the driest conditions of the year.

Rainfall in Cardiff in March

With the driest weather of the year, this month is a solid choice for exploring, even if you'll want to dress warmly. You can expect rain on roughly 18 days based on historical data, averaging 76 mm (3 in) for the month. With rain spread across many days but low totals, showers are typically short and light rather than heavy.

Temperature in Cardiff in March

Expect highs of 11°C (52°F) in Cardiff in March, with nights dropping to around 5°C (41°F). Cold conditions persist throughout the day, so warm clothing is important from the moment you head outside. At 5°C (41°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.

Sunshine in Cardiff in March

The city usually sees around 119 hours of sunlight, indicating a moderately sunny period.

Wind Speed in Cardiff in March

Wind speeds average 5 m/s (10 knots) during March. At this speed, gentle to moderate breezes make small trees sway and the wind creates whitecaps on water bodies. Daily variations range from moderate winds to stronger breezes, creating excellent conditions for sailing, kite flying and wind sports.

Average water temperature in March

The water temperature is only 7°C (45°F) this month — cold enough that most people will want to stay out. Hardy swimmers may manage a quick dip, but it won't be comfortable.

If you prefer dry days with pleasant temperatures, July and August typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
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• 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 March

Min Temperature 5°C (41°F)  

Max Temperature 11°C (52°F)  

Water Temperature 7°C (45°F)  

Chance of Rain 58%  

Precipitation 76 mm (3 in)  

Rainy days 18 days  

Humidity 82%  

Windspeed 5 m/s (10 knots)  

Sunshine 119 hours  

Percentage Sunshine 33%  

Daily Historical Temperatures

50-year average (1976-2025)

Based on our historical records, temperatures in Cardiff typically stay consistent throughout March, with daily highs averaging around 11°C (52°F). Nights are cold, with lows typically ranging from 3°C (37°F) to 5°C (41°F).

Average temperatures in March

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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 March

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Historical weather for Cardiff in March

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 March

According to our 37 years of weather records for Cardiff, the following extremes were recorded between 1989 and 2026.

• Cardiff recorded its highest March temperature of 20°C (68°F) on March 30, 2021.
• The lowest daytime temperature in March was -3°C (27°F), recorded on March 1, 2018.
• Cardiff registered its coldest March night on March 1, 2018, with temperatures dropping to -6°C (21°F).
• The heaviest March precipitation occurred on March 5, 2018, when 49 mm (1.9 in) of precipitation fell.

What to Wear in Cardiff in March

Pack for changing conditions in Cardiff in March. Bring a mix of short and long sleeves, a warm layer like a hoodie or light jacket, and comfortable pants. The key is being able to add or remove layers as the days goes by. Rain gear is recommended, you can expect wet weather on multiple days. With water temperatures around 7°C (45°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Cardiff in March

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

Swimming

5/10

Cycling

6/10

Walking

6/10

Camping

4/10

Outdoor sports

6/10

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.