Annual mean 11°C · wettest around December · prevailing wind W
Warmest
27.2 °C
Coldest
0.9 °C
Wettest
23%
Windiest
4.8 m/s
Prevailing
W
3.9 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
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 Wellesley over the whole year is 11°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -3°C. Wellesley has no sharply defined rainy season: the chance of rain on a given day runs from 12% in August, the driest month, to 19% in December, the wettest. Winds in Wellesley are highest in March, averaging 3.7 m/s (13 km/h), and lightest in August, at 2.4 m/s (9 km/h). The prevailing wind is from the W. The clearest skies in Wellesley come in August, when the sky is typically 40% covered; April is the cloudiest month, at 53%.
Month by month Wellesley 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
1°C
-3°C
-5°C
15%
52%
3.4 m/s
0
0
5
February
3°C
-2°C
-3°C
16%
49%
3.3 m/s
2
0
11
March
7°C
1°C
1°C
16%
49%
3.7 m/s
3
0
22
April
12°C
6°C
7°C
19%
53%
3.5 m/s
13
1
48
May
18°C
12°C
15°C
16%
52%
3.1 m/s
45
9
70
June
24°C
17°C
22°C
13%
46%
2.8 m/s
72
31
53
July
27°C
20°C
27°C
13%
42%
2.5 m/s
48
59
21
August
26°C
19°C
26°C
12%
40%
2.4 m/s
60
51
29
September
22°C
15°C
21°C
14%
46%
2.5 m/s
71
24
61
October
16°C
10°C
13°C
16%
50%
2.6 m/s
44
4
73
November
10°C
4°C
5°C
16%
41%
3.1 m/s
10
0
35
December
4°C
-1°C
-2°C
19%
48%
3.1 m/s
0
0
11
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 Wellesley weather by season
Year round, Wellesley has days of about 1°C at their warmest in January, its coolest month, and 27°C in July, its warmest; the coolest hours of the day run from -3°C to 20°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 August. 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.
Wellesley weather in winterDecember to February
High 3°CLow -2°CRain 17%
Winter in Wellesley has typical daily highs of about 3°C and lows of about -2°C, with a 17% chance of rain on a given day.
Wellesley weather in springMarch to May
High 12°CLow 6°CRain 17%
Spring in Wellesley has typical daily highs of about 12°C and lows of about 6°C, with a 17% chance of rain on a given day.
Wellesley weather in summerJune to August
High 26°CLow 19°CRain 13%
Summer in Wellesley has typical daily highs of about 26°C and lows of about 19°C, with a 13% chance of rain on a given day.
Wellesley weather in autumnSeptember to November
High 16°CLow 9°CRain 15%
Autumn in Wellesley has typical daily highs of about 16°C and lows of about 9°C, with a 15% chance of rain on a given day.
When is the rainy season in Wellesley?
Wellesley has no sharply defined rainy season: the chance of rain on a given day runs from 12% in August, the driest month, to 19% in December, the wettest.
What time of year is Wellesley windiest?
Winds in Wellesley are highest in March, averaging 3.7 m/s (13 km/h), and lightest in August, at 2.4 m/s (9 km/h). The prevailing wind is from the W.
What is the average temperature in Wellesley year round?
The average temperature in Wellesley over the whole year is 11°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -3°C.