Annual mean 14°C · wettest around July · prevailing wind N
Warmest
19.7 °C
Coldest
11.3 °C
Wettest
22%
Windiest
8.2 m/s
Prevailing
N
7.1 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 Blenheim over the whole year is 14°C. February is the hottest month, with highs of about 20°C; August is the coldest, with lows of about 9°C. Blenheim has no sharply defined rainy season: the chance of rain on a given day runs from 8% in January, the driest month, to 16% in July, the wettest. Winds in Blenheim are highest in September, averaging 7.0 m/s (25 km/h), and lightest in June, at 5.7 m/s (21 km/h). The prevailing wind is from the N. The clearest skies in Blenheim come in February, when the sky is typically 47% covered; August is the cloudiest month, at 58%.
Month by month Blenheim 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
19°C
16°C
15°C
8%
54%
6.6 m/s
55
3
77
February
20°C
16°C
15°C
10%
47%
6.6 m/s
58
1
78
March
18°C
15°C
14°C
8%
54%
6.3 m/s
47
1
80
April
16°C
13°C
12°C
11%
49%
6.0 m/s
30
0
78
May
14°C
12°C
10°C
13%
52%
6.0 m/s
13
0
69
June
12°C
10°C
8°C
15%
58%
5.7 m/s
3
0
57
July
12°C
9°C
7°C
16%
54%
5.9 m/s
1
0
49
August
12°C
9°C
6°C
14%
58%
6.1 m/s
1
0
49
September
13°C
10°C
7°C
13%
56%
7.0 m/s
3
0
52
October
15°C
11°C
9°C
12%
57%
6.8 m/s
9
0
63
November
16°C
13°C
11°C
12%
57%
6.9 m/s
23
0
72
December
18°C
15°C
14°C
12%
57%
6.9 m/s
42
0
76
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 Blenheim weather by season
Year round, Blenheim has days of about 12°C at their warmest in July, its coolest month, and 20°C in February, its warmest; the coolest hours of the day run from 9°C to 16°C through the year, and the average temperature over the year is 14°C around the clock. Rain is most likely around July and least likely around January. 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.
Blenheim weather in winterJune to August
High 12°CLow 9°CRain 15%
Winter in Blenheim has typical daily highs of about 12°C and lows of about 9°C, with a 15% chance of rain on a given day.
Blenheim weather in springSeptember to November
High 15°CLow 11°CRain 12%
Spring in Blenheim has typical daily highs of about 15°C and lows of about 11°C, with a 12% chance of rain on a given day.
Blenheim weather in summerDecember to February
High 19°CLow 16°CRain 10%
Summer in Blenheim has typical daily highs of about 19°C and lows of about 16°C, with a 10% chance of rain on a given day.
Blenheim weather in autumnMarch to May
High 16°CLow 13°CRain 11%
Autumn in Blenheim has typical daily highs of about 16°C and lows of about 13°C, with a 11% chance of rain on a given day.
When is the rainy season in Blenheim?
Blenheim has no sharply defined rainy season: the chance of rain on a given day runs from 8% in January, the driest month, to 16% in July, the wettest.
What time of year is Blenheim windiest?
Winds in Blenheim are highest in September, averaging 7.0 m/s (25 km/h), and lightest in June, at 5.7 m/s (21 km/h). The prevailing wind is from the N.
What is the average temperature in Blenheim year round?
The average temperature in Blenheim over the whole year is 14°C. February is the hottest month, with highs of about 20°C; August is the coldest, with lows of about 9°C.