Annual mean 11°C · wettest around March · prevailing wind SW
Warmest
21.7 °C
Coldest
5.7 °C
Wettest
52%
Windiest
5.6 m/s
Prevailing
SW
4.6 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 Chepstow over the whole year is 11°C. July is the hottest month, with highs of about 21°C; January is the coldest, with lows of about 4°C. Chepstow has no sharply defined rainy season: the chance of rain on a given day runs from 25% in July, the driest month, to 40% in March, the wettest. Winds in Chepstow are highest in February, averaging 4.5 m/s (16 km/h), and lightest in November, at 3.3 m/s (12 km/h). The prevailing wind is from the SW. The clearest skies in Chepstow come in May, when the sky is typically 56% covered; December is the cloudiest month, at 71%.
Month by month Chepstow 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
4°C
2°C
29%
68%
3.8 m/s
0
0
16
February
7°C
4°C
2°C
34%
68%
4.5 m/s
0
0
17
March
9°C
5°C
4°C
40%
68%
4.2 m/s
1
0
31
April
12°C
7°C
8°C
29%
61%
3.8 m/s
8
0
55
May
16°C
10°C
13°C
35%
56%
3.5 m/s
34
0
80
June
19°C
14°C
16°C
30%
60%
3.7 m/s
57
5
78
July
21°C
15°C
19°C
25%
59%
3.5 m/s
74
12
71
August
20°C
14°C
17°C
37%
62%
3.6 m/s
69
5
77
September
18°C
12°C
15°C
35%
61%
3.5 m/s
49
2
80
October
14°C
10°C
11°C
34%
67%
3.6 m/s
18
0
78
November
9°C
6°C
6°C
32%
69%
3.3 m/s
1
0
41
December
8°C
6°C
4°C
33%
71%
3.7 m/s
0
0
26
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 Chepstow weather by season
Year round, Chepstow has days of about 7°C at their warmest in January, its coolest month, and 21°C in July, its warmest; the coolest hours of the day run from 4°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 March 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.
Chepstow weather in winterDecember to February
High 7°CLow 5°CRain 32%
Winter in Chepstow has typical daily highs of about 7°C and lows of about 5°C, with a 32% chance of rain on a given day.
Chepstow weather in springMarch to May
High 12°CLow 7°CRain 34%
Spring in Chepstow has typical daily highs of about 12°C and lows of about 7°C, with a 34% chance of rain on a given day.
Chepstow weather in summerJune to August
High 20°CLow 14°CRain 31%
Summer in Chepstow has typical daily highs of about 20°C and lows of about 14°C, with a 31% chance of rain on a given day.
Chepstow weather in autumnSeptember to November
High 14°CLow 10°CRain 34%
Autumn in Chepstow has typical daily highs of about 14°C and lows of about 10°C, with a 34% chance of rain on a given day.
When is the rainy season in Chepstow?
Chepstow has no sharply defined rainy season: the chance of rain on a given day runs from 25% in July, the driest month, to 40% in March, the wettest.
What time of year is Chepstow windiest?
Winds in Chepstow are highest in February, averaging 4.5 m/s (16 km/h), and lightest in November, at 3.3 m/s (12 km/h). The prevailing wind is from the SW.
What is the average temperature in Chepstow year round?
The average temperature in Chepstow over the whole year is 11°C. July is the hottest month, with highs of about 21°C; January is the coldest, with lows of about 4°C.