Annual mean 11°C · wettest around December · prevailing wind SW
Warmest
19.0 °C
Coldest
6.6 °C
Wettest
34%
Windiest
7.5 m/s
Prevailing
SW
6.2 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Llanelli over the whole year is 11°C. July is the hottest month, with highs of about 18°C; January is the coldest, with lows of about 6°C. The rainy (wet) season in Llanelli runs from October to March, peaking in December with a 32% chance of rain on a given day. The dry season is April to September; May is the driest month, at 14%. Winds in Llanelli are highest in February, averaging 6.7 m/s (24 km/h), and lightest in May, at 4.8 m/s (17 km/h). The prevailing wind is from the SW. The clearest skies in Llanelli come in May, when the sky is typically 55% covered; December is the cloudiest month, at 74%.
Month by month Llanelli climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
7°C
6°C
1°C
26%
70%
6.0 m/s
0
0
11
February
8°C
6°C
2°C
26%
68%
6.7 m/s
0
0
15
March
9°C
6°C
3°C
24%
67%
6.1 m/s
0
0
26
April
11°C
7°C
6°C
16%
59%
5.2 m/s
3
0
46
May
15°C
10°C
10°C
14%
55%
4.8 m/s
18
0
73
June
17°C
14°C
14°C
17%
61%
5.1 m/s
41
1
80
July
18°C
15°C
16°C
17%
63%
5.0 m/s
58
4
79
August
18°C
15°C
15°C
18%
63%
5.3 m/s
55
2
79
September
17°C
13°C
13°C
23%
63%
5.3 m/s
40
2
76
October
14°C
11°C
9°C
27%
66%
6.1 m/s
9
0
64
November
10°C
8°C
5°C
28%
69%
6.1 m/s
0
0
36
December
8°C
7°C
3°C
32%
74%
6.3 m/s
0
0
18
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Llanelli weather by season
Year round, Llanelli has days of about 7°C at their warmest in January, its coolest month, and 18°C in July, its warmest; the coolest hours of the day run from 6°C to 15°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around December and least likely around May. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Llanelli weather in winterDecember to February
High 8°CLow 6°CRain 28%
Winter in Llanelli has typical daily highs of about 8°C and lows of about 6°C, with a 28% chance of rain on a given day.
Llanelli weather in springMarch to May
High 12°CLow 8°CRain 18%
Spring in Llanelli has typical daily highs of about 12°C and lows of about 8°C, with a 18% chance of rain on a given day.
Llanelli weather in summerJune to August
High 18°CLow 14°CRain 17%
Summer in Llanelli has typical daily highs of about 18°C and lows of about 14°C, with a 17% chance of rain on a given day.
Llanelli weather in autumnSeptember to November
High 14°CLow 11°CRain 26%
Autumn in Llanelli has typical daily highs of about 14°C and lows of about 11°C, with a 26% chance of rain on a given day.
When is the rainy season in Llanelli?
The rainy (wet) season in Llanelli runs from October to March, peaking in December with a 32% chance of rain on a given day. The dry season is April to September; May is the driest month, at 14%.
What time of year is Llanelli windiest?
Winds in Llanelli are highest in February, averaging 6.7 m/s (24 km/h), and lightest in May, at 4.8 m/s (17 km/h). The prevailing wind is from the SW.
What is the average temperature in Llanelli year round?
The average temperature in Llanelli over the whole year is 11°C. July is the hottest month, with highs of about 18°C; January is the coldest, with lows of about 6°C.