Annual mean 11°C · wettest around December · prevailing wind SW
Warmest
20.4 °C
Coldest
6.5 °C
Wettest
40%
Windiest
5.9 m/s
Prevailing
SW
5.1 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 Llantrisant over the whole year is 11°C. July is the hottest month, with highs of about 20°C; January is the coldest, with lows of about 5°C. Llantrisant has no sharply defined rainy season: the chance of rain on a given day runs from 22% in July, the driest month, to 36% in December, the wettest. Winds in Llantrisant are highest in February, averaging 5.0 m/s (18 km/h), and lightest in September, at 4.0 m/s (14 km/h). The prevailing wind is from the SW. The clearest skies in Llantrisant come in May, when the sky is typically 48% covered; December is the cloudiest month, at 71%.
Month by month Llantrisant 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
5°C
2°C
30%
65%
4.4 m/s
0
0
15
February
8°C
5°C
3°C
33%
67%
5.0 m/s
0
0
20
March
9°C
6°C
4°C
33%
64%
4.7 m/s
1
0
31
April
12°C
7°C
7°C
24%
53%
4.5 m/s
6
0
51
May
16°C
11°C
12°C
25%
48%
4.2 m/s
25
0
76
June
18°C
14°C
15°C
23%
56%
4.4 m/s
49
3
79
July
20°C
15°C
17°C
22%
56%
4.1 m/s
66
8
76
August
19°C
15°C
17°C
27%
58%
4.1 m/s
66
4
79
September
17°C
13°C
15°C
29%
58%
4.0 m/s
49
3
79
October
14°C
11°C
11°C
33%
62%
4.3 m/s
17
0
74
November
10°C
8°C
6°C
32%
66%
4.4 m/s
1
0
44
December
8°C
7°C
4°C
36%
71%
4.7 m/s
0
0
25
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 Llantrisant weather by season
Year round, Llantrisant has days of about 7°C at their warmest in January, its coolest month, and 20°C in July, its warmest; the coolest hours of the day run from 5°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 July. 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.
Llantrisant weather in winterDecember to February
High 8°CLow 6°CRain 33%
Winter in Llantrisant has typical daily highs of about 8°C and lows of about 6°C, with a 33% chance of rain on a given day.
Llantrisant weather in springMarch to May
High 12°CLow 8°CRain 27%
Spring in Llantrisant has typical daily highs of about 12°C and lows of about 8°C, with a 27% chance of rain on a given day.
Llantrisant weather in summerJune to August
High 19°CLow 15°CRain 24%
Summer in Llantrisant has typical daily highs of about 19°C and lows of about 15°C, with a 24% chance of rain on a given day.
Llantrisant weather in autumnSeptember to November
High 14°CLow 10°CRain 31%
Autumn in Llantrisant has typical daily highs of about 14°C and lows of about 10°C, with a 31% chance of rain on a given day.
When is the rainy season in Llantrisant?
Llantrisant has no sharply defined rainy season: the chance of rain on a given day runs from 22% in July, the driest month, to 36% in December, the wettest.
What time of year is Llantrisant windiest?
Winds in Llantrisant are highest in February, averaging 5.0 m/s (18 km/h), and lightest in September, at 4.0 m/s (14 km/h). The prevailing wind is from the SW.
What is the average temperature in Llantrisant year round?
The average temperature in Llantrisant over the whole year is 11°C. July is the hottest month, with highs of about 20°C; January is the coldest, with lows of about 5°C.