Annual mean 15°C · wettest around September · prevailing wind W
Warmest
23.3 °C
Coldest
11.8 °C
Wettest
28%
Windiest
6.0 m/s
Prevailing
W
4.9 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 Somerville over the whole year is 15°C. January is the hottest month, with highs of about 23°C; July is the coldest, with lows of about 9°C. The rainy (wet) season in Somerville runs from April to December, peaking in September with a 24% chance of rain on a given day. The dry season is January to March; February is the driest month, at 8%. Winds in Somerville are highest in September, averaging 4.8 m/s (17 km/h), and lightest in April, at 3.6 m/s (13 km/h). The prevailing wind is from the W. The clearest skies in Somerville come in February, when the sky is typically 69% covered; June is the cloudiest month, at 78%.
Month by month Somerville 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
23°C
18°C
21°C
13%
72%
4.6 m/s
68
24
59
February
23°C
17°C
20°C
8%
69%
4.7 m/s
72
22
63
March
22°C
16°C
19°C
13%
70%
4.2 m/s
72
20
64
April
19°C
14°C
16°C
18%
73%
3.6 m/s
64
4
82
May
15°C
11°C
12°C
22%
74%
3.8 m/s
28
0
81
June
12°C
9°C
9°C
24%
78%
4.1 m/s
5
0
70
July
12°C
9°C
8°C
24%
76%
4.7 m/s
2
0
62
August
13°C
9°C
9°C
24%
73%
4.3 m/s
5
0
69
September
15°C
11°C
11°C
24%
75%
4.8 m/s
17
0
76
October
17°C
12°C
13°C
22%
74%
4.7 m/s
35
1
81
November
19°C
14°C
16°C
21%
74%
4.4 m/s
48
12
72
December
21°C
15°C
19°C
17%
72%
4.4 m/s
63
16
69
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 Somerville weather by season
Year round, Somerville has days of about 12°C at their warmest in July, its coolest month, and 23°C in January, its warmest; the coolest hours of the day run from 9°C to 18°C through the year, and the average temperature over the year is 15°C around the clock. Rain is most likely around September and least likely around February. 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.
Somerville weather in winterJune to August
High 13°CLow 9°CRain 24%
Winter in Somerville has typical daily highs of about 13°C and lows of about 9°C, with a 24% chance of rain on a given day.
Somerville weather in springSeptember to November
High 17°CLow 12°CRain 22%
Spring in Somerville has typical daily highs of about 17°C and lows of about 12°C, with a 22% chance of rain on a given day.
Somerville weather in summerDecember to February
High 22°CLow 17°CRain 13%
Summer in Somerville has typical daily highs of about 22°C and lows of about 17°C, with a 13% chance of rain on a given day.
Somerville weather in autumnMarch to May
High 18°CLow 14°CRain 17%
Autumn in Somerville has typical daily highs of about 18°C and lows of about 14°C, with a 17% chance of rain on a given day.
When is the rainy season in Somerville?
The rainy (wet) season in Somerville runs from April to December, peaking in September with a 24% chance of rain on a given day. The dry season is January to March; February is the driest month, at 8%.
What time of year is Somerville windiest?
Winds in Somerville are highest in September, averaging 4.8 m/s (17 km/h), and lightest in April, at 3.6 m/s (13 km/h). The prevailing wind is from the W.
What is the average temperature in Somerville year round?
The average temperature in Somerville over the whole year is 15°C. January is the hottest month, with highs of about 23°C; July is the coldest, with lows of about 9°C.