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Day Weather Maximum Day Temperature Minimum Night Temperature Wind Direction and Speed
Thursday

Sunny Intervals

23°C 73°F 17°C 63°F East North Easterly
19km/h 12mph
Friday

Light Rain

20°C 68°F 17°C 63°F East North Easterly
13km/h 8mph
Saturday

Light Cloud

20°C 68°F 14°C 57°F North Easterly
11km/h 7mph
Sunday

Sunny

18°C 64°F 11°C 52°F East North Easterly
16km/h 10mph
Monday

Sunny Intervals

17°C 63°F 12°C 54°F East South Easterly
11km/h 7mph

IN ASSOCIATION WITH

Forecast

Sunrise 06:52 Sunset 19:21

Last updated 11:10

Weather forecast details for Thursday 18 September. Each column contains hourly forecast details for weather conditions, temperature, wind speed, wind direction, humidity, visibility and pressure.
Time 1600 hours1900 hours2200 hours0100 hours
Fri
0400 hours   
Weather Conditions Sunny Intervals Light Cloud Light Cloud Light Rain Shower Light Cloud    
Temperature (°C/°F) 22°C 72°F 22°C 72°F 21°C 70°F 19°C 66°F 18°C 64°F    
Wind Speed (mph/km/h) 18km/h 11mph East North Easterly 14km/h 9mph East North Easterly 11km/h 7mph East North Easterly 11km/h 7mph East North Easterly 11km/h 7mph East North Easterly    
Wind Direction ENE ENE ENE ENE ENE    
Humidity 67% 69% 77% 84% 90%    
Visibility (E = Excellent, VG = Very Good, G = Good, M = Moderate, P = Poor, VP = Very Poor) M M M M M    
Pressure (Millibars) 1009 1009 1010 1010 1010    

Wales

Forecast Summary

  • Today

    It will be another fine day with warm sunny spells developing once low cloud and mist clears away from eastern parts. It will be largely dry but the odd heavy and thundery shower is possible in the south later.

  • Tonight

    Mostly clear through the evening but low cloud, mist and fog patches will return to the east overnight. A few heavy, thundery showers possible in the south and west.

Environmental Summary

UV: 4

UK Range: 1-7

Pollen: Moderate

UK Range: Low to Very High

Met Office Warnings Issued For: Cardiff

  1. Yellow warning of rain

    From:
    0015 on Fri 19 September
    To:
    2345 on Fri 19 September
    Updated 18 September at 11:01

    Warning

    Heavy showers and thunderstorms are likely to spread from the south across some southern and western parts of England, and also Wales, on Thursday night - the risk then continuing through much of Friday. Many places will miss these but the public should be aware of the potential for isolated disruption due to surface water flooding, lightning strikes and hail.

A list of all UK Warnings can be found on our More UK Weather page.

Weather Warnings Key

  • Red: Take action
  • Amber: Be prepared
  • Yellow: Be aware

Issued by the Met Office

Average Conditions

BBC Weather's average conditions for London, United Kingdom. This includes readings of average sunlight, temperature, discomfort from heat and humidity, relative humidity, average Precipitation, and wet days.
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average Minimum Temperature (°C) 2 2 3 5 8 11 12 13 11 8 5 3
Average Minimum Temperature (°F) 35 35 38 41 46 51 54 55 51 46 41 37
Average Maximum Temperature (°C) 7 7 10 13 16 19 20 21 18 14 10 8
Average Maximum Temperature (°F) 45 45 50 56 61 68 69 69 64 58 51 46
Record Minimum Temperature (°C) -17 -9 -8 -3 -1 4 7 6 2 -3 -3 -7
Record Minimum Temperature (°F) 2 15 18 27 31 39 44 43 35 26 26 19
Record Maximum Temperature (°C) 15 16 20 24 29 31 31 33 28 25 18 15
Record Maximum Temperature (°F) 59 61 68 75 84 87 88 91 83 77 65 59
Average Precipitation (mm) 108 72 63 65 76 63 89 97 99 109 116 108
Average Precipitation (inches) 4.3 2.8 2.5 2.6 3.0 2.5 3.5 3.8 3.9 4.3 4.7 4.3
Average Sunlight Hours 2 3 4 5 6 7 6 6 5 3 2 2
Wet Days (+0.1 mm) 18 14 13 13 13 13 14 15 16 16 17 18
Relative Humidity AM 89 87 82 74 74 73 76 78 81 85 88 89
Relative Humidity PM <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span>
Discomfort From Heat And Humidity <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span> <span class="unit-na" title="Not Available">--</span>

Average Conditions data © Copyright RM, 2011. All rights reserved. Helicon Publishing is a division of RM.

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Forecast Video

BBC Wales Today

BBC Wales Today Forecast Last updated 14:45, Wednesday 17 Sep Forecast updated Monday to Friday only

UK

UK Forecast Last updated 13:00, Thursday 18 Sep

Observations

Observed at 12:00, Thursday 18 September

Sunny

19°C 66°F

27km/h 17mph East North Easterly

Humidity: 78%

Visibility: Good

Pressure: 1008mb, Falling

Observation station: St. Athan

(Lat: 51.4 | Lon: -3.433)

BBC Weather in association with the Met Office

All times are BST (Europe/London, GMT+0100) unless otherwise stated

Information given for most appropriate forecast location. See FAQs for details