Weather in Cardiff in May

General weather information about Cardiff

Average annual temperature is 14.2 °C

Absolute maximum temperature: 35.5 °C

Absolute minimum temperature: -9.8 °C

Number of sunny days: 186 days

Number of rainy days: 178 days

Number of snow days: 1 day

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* Weather data for Cardiff United States is based on climate observations for 2026 year

Cardiff air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)18.918.219.229.728.529.935.133.835.527.321.917.7
Average daytime temperature (°C)10.310.512.219.220.425.630.028.825.720.813.310.6
Average temperature (°C)6.46.06.813.915.520.425.524.021.215.58.36.7
Average night temperature (°C)3.11.92.19.611.215.921.620.217.411.34.13.2
Absolute minimum temperature (°C)-2.9-9.8-3.21.64.09.718.016.012.14.5-4.4-3.2

Cardiff monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.014.014.014.013.011.010.09.0
Daylight mean duration (h)9.810.712.013.214.314.914.613.712.511.210.09.4
Daylight minimum duration (h)9.010.011.012.013.014.014.013.011.010.09.09.0
Sunshine mean duration (h)5.47.07.69.511.510.711.910.48.88.67.95.7
Precipitation (mm)7750741255994126831926160237
Sunny days14151318191391114182319
Rainy days17131712121722201613712
Snow days001000000000

Cardiff - weather forecast by months

Cardiff weather in januaryCardiff weather in februaryCardiff weather in marchCardiff weather in aprilCardiff weather in mayCardiff weather in juneCardiff weather in julyCardiff weather in augustCardiff weather in septemberCardiff weather in octoberCardiff weather in novemberCardiff weather in december

Best time to visit Cardiff:

The best time to visit Cardiff during the most sunny months:

  • May — 11.5(h)
  • July — 11.9(h)

The largest precipitation sum in Cardiff is at

  • September — 192(mm)
  • December — 237(mm)

    • Weather forecast in the closest to Cardiff admin centers

    Weather forecast in the closest towns to Cardiff

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    Frequently asked questions

    When is the best time to visit Cardiff?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Cardiff.
    What is the weather like in Cardiff?
    See average temperature, rainfall and daylight hours for Cardiff by month in the table above.
    How many sunny days does Cardiff have?
    The monthly weather statistics above show sunshine and rainfall patterns for Cardiff throughout the year.