Annual mean 12°C · wettest around December · prevailing wind SW
Warmest
20.0 °C
Coldest
7.3 °C
Wettest
30%
Windiest
7.5 m/s
Prevailing
SW
6.3 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 Dorchester over the whole year is 12°C. July is the hottest month, with highs of about 20°C; January is the coldest, with lows of about 6°C. Dorchester has no sharply defined rainy season: the chance of rain on a given day runs from 13% in July, the driest month, to 27% in December, the wettest. Winds in Dorchester are highest in February, averaging 6.8 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 Dorchester come in July, when the sky is typically 57% covered; December is the cloudiest month, at 73%.
Month by month Dorchester 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
8°C
6°C
2°C
25%
69%
6.2 m/s
0
0
13
February
8°C
6°C
2°C
23%
67%
6.8 m/s
0
0
19
March
10°C
6°C
4°C
25%
68%
6.2 m/s
0
0
28
April
12°C
7°C
7°C
18%
59%
5.3 m/s
5
0
49
May
15°C
11°C
11°C
18%
57%
4.8 m/s
22
0
76
June
18°C
14°C
15°C
17%
59%
4.8 m/s
51
2
82
July
20°C
16°C
17°C
13%
57%
4.8 m/s
68
6
78
August
20°C
15°C
17°C
16%
58%
5.0 m/s
70
4
79
September
18°C
13°C
15°C
19%
62%
5.3 m/s
50
2
79
October
15°C
12°C
10°C
26%
67%
5.9 m/s
16
0
70
November
11°C
9°C
6°C
25%
69%
6.4 m/s
1
0
39
December
9°C
8°C
3°C
27%
73%
6.6 m/s
0
0
24
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 Dorchester weather by season
Year round, Dorchester has days of about 8°C at their warmest in January, its coolest month, and 20°C in July, its warmest; the coolest hours of the day run from 6°C to 16°C through the year, and the average temperature over the year is 12°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.
Dorchester weather in winterDecember to February
High 8°CLow 6°CRain 25%
Winter in Dorchester has typical daily highs of about 8°C and lows of about 6°C, with a 25% chance of rain on a given day.
Dorchester weather in springMarch to May
High 12°CLow 8°CRain 20%
Spring in Dorchester has typical daily highs of about 12°C and lows of about 8°C, with a 20% chance of rain on a given day.
Dorchester weather in summerJune to August
High 19°CLow 15°CRain 15%
Summer in Dorchester has typical daily highs of about 19°C and lows of about 15°C, with a 15% chance of rain on a given day.
Dorchester weather in autumnSeptember to November
High 14°CLow 11°CRain 23%
Autumn in Dorchester has typical daily highs of about 14°C and lows of about 11°C, with a 23% chance of rain on a given day.
When is the rainy season in Dorchester?
Dorchester has no sharply defined rainy season: the chance of rain on a given day runs from 13% in July, the driest month, to 27% in December, the wettest.
What time of year is Dorchester windiest?
Winds in Dorchester are highest in February, averaging 6.8 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 Dorchester year round?
The average temperature in Dorchester over the whole year is 12°C. July is the hottest month, with highs of about 20°C; January is the coldest, with lows of about 6°C.