Annual mean 14°C · wettest around December · prevailing wind W
Warmest
23.7 °C
Coldest
15.1 °C
Wettest
14%
Windiest
5.8 m/s
Prevailing
W
4.3 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 Arroyo Grande over the whole year is 14°C. September is the hottest month, with highs of about 23°C; February is the coldest, with lows of about 8°C. Arroyo Grande has no sharply defined rainy season: the chance of rain on a given day runs from 3% in July, the driest month, to 15% in December, the wettest. Winds in Arroyo Grande are highest in April, averaging 3.7 m/s (13 km/h), and lightest in November, at 2.4 m/s (9 km/h). The prevailing wind is from the W. The clearest skies in Arroyo Grande come in November, when the sky is typically 25% covered; May is the cloudiest month, at 47%.
Month by month Arroyo Grande 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
16°C
8°C
13°C
15%
37%
2.8 m/s
35
1
86
February
16°C
8°C
13°C
14%
33%
3.1 m/s
38
2
82
March
16°C
9°C
13°C
15%
45%
3.3 m/s
37
2
83
April
18°C
10°C
15°C
9%
39%
3.7 m/s
47
5
82
May
18°C
11°C
15°C
6%
47%
3.7 m/s
53
6
83
June
21°C
13°C
18°C
4%
41%
3.5 m/s
69
13
77
July
22°C
13°C
20°C
3%
42%
3.1 m/s
78
18
72
August
22°C
14°C
21°C
4%
42%
2.9 m/s
79
22
67
September
23°C
14°C
21°C
4%
39%
2.7 m/s
77
24
65
October
22°C
12°C
20°C
6%
30%
2.6 m/s
79
20
71
November
19°C
9°C
17°C
9%
25%
2.4 m/s
68
7
85
December
16°C
8°C
13°C
15%
33%
2.5 m/s
40
0
87
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 Arroyo Grande weather by season
Year round, Arroyo Grande has days of about 16°C at their warmest in January, its coolest month, and 23°C in September, its warmest; the coolest hours of the day run from 8°C to 14°C through the year, and the average temperature over the year is 14°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.
Arroyo Grande weather in winterDecember to February
High 16°CLow 8°CRain 15%
Winter in Arroyo Grande has typical daily highs of about 16°C and lows of about 8°C, with a 15% chance of rain on a given day.
Arroyo Grande weather in springMarch to May
High 18°CLow 10°CRain 10%
Spring in Arroyo Grande has typical daily highs of about 18°C and lows of about 10°C, with a 10% chance of rain on a given day.
Arroyo Grande weather in summerJune to August
High 22°CLow 13°CRain 3%
Summer in Arroyo Grande has typical daily highs of about 22°C and lows of about 13°C, with a 3% chance of rain on a given day.
Arroyo Grande weather in autumnSeptember to November
High 21°CLow 11°CRain 6%
Autumn in Arroyo Grande has typical daily highs of about 21°C and lows of about 11°C, with a 6% chance of rain on a given day.
When is the rainy season in Arroyo Grande?
Arroyo Grande has no sharply defined rainy season: the chance of rain on a given day runs from 3% in July, the driest month, to 15% in December, the wettest.
What time of year is Arroyo Grande windiest?
Winds in Arroyo Grande are highest in April, averaging 3.7 m/s (13 km/h), and lightest in November, at 2.4 m/s (9 km/h). The prevailing wind is from the W.
What is the average temperature in Arroyo Grande year round?
The average temperature in Arroyo Grande over the whole year is 14°C. September is the hottest month, with highs of about 23°C; February is the coldest, with lows of about 8°C.