Annual mean 17°C · wettest around January · prevailing wind S
Warmest
29.4 °C
Coldest
14.9 °C
Wettest
6%
Windiest
4.7 m/s
Prevailing
S
3.9 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
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 Castaic over the whole year is 17°C. August is the hottest month, with highs of about 29°C; January is the coldest, with lows of about 8°C. Castaic has no sharply defined rainy season: the chance of rain on a given day runs from 0% in June, the driest month, to 6% in January, the wettest. Winds in Castaic are highest in April, averaging 3.6 m/s (13 km/h), and lightest in October, at 2.8 m/s (10 km/h). The prevailing wind is from the S. The clearest skies in Castaic come in August, when the sky is typically 13% covered; May is the cloudiest month, at 34%.
Month by month Castaic 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
15°C
8°C
11°C
6%
25%
3.1 m/s
34
1
74
February
16°C
9°C
12°C
5%
25%
3.3 m/s
38
2
73
March
17°C
9°C
12°C
6%
32%
3.5 m/s
41
3
74
April
20°C
12°C
16°C
2%
25%
3.6 m/s
62
10
77
May
21°C
14°C
18°C
1%
34%
3.5 m/s
73
14
75
June
25°C
18°C
23°C
0%
25%
3.4 m/s
73
36
52
July
28°C
20°C
27°C
0%
14%
3.2 m/s
55
57
27
August
29°C
20°C
28°C
0%
13%
3.0 m/s
50
61
22
September
27°C
18°C
26°C
0%
18%
2.9 m/s
63
49
36
October
25°C
15°C
22°C
0%
17%
2.8 m/s
74
31
57
November
20°C
11°C
16°C
2%
15%
2.8 m/s
65
9
77
December
16°C
9°C
12°C
5%
22%
2.9 m/s
41
1
77
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 Castaic weather by season
Year round, Castaic has days of about 15°C at their warmest in January, its coolest month, and 29°C in August, its warmest; the coolest hours of the day run from 8°C to 20°C through the year, and the average temperature over the year is 17°C around the clock. Rain is most likely around January and least likely around June. 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.
Castaic weather in winterDecember to February
High 16°CLow 9°CRain 5%
Winter in Castaic has typical daily highs of about 16°C and lows of about 9°C, with a 5% chance of rain on a given day.
Castaic weather in springMarch to May
High 19°CLow 12°CRain 3%
Spring in Castaic has typical daily highs of about 19°C and lows of about 12°C, with a 3% chance of rain on a given day.
Castaic weather in summerJune to August
High 27°CLow 19°CRain 0%
Summer in Castaic has typical daily highs of about 27°C and lows of about 19°C, with a 0% chance of rain on a given day.
Castaic weather in autumnSeptember to November
High 24°CLow 15°CRain 1%
Autumn in Castaic has typical daily highs of about 24°C and lows of about 15°C, with a 1% chance of rain on a given day.
When is the rainy season in Castaic?
Castaic has no sharply defined rainy season: the chance of rain on a given day runs from 0% in June, the driest month, to 6% in January, the wettest.
What time of year is Castaic windiest?
Winds in Castaic are highest in April, averaging 3.6 m/s (13 km/h), and lightest in October, at 2.8 m/s (10 km/h). The prevailing wind is from the S.
What is the average temperature in Castaic year round?
The average temperature in Castaic over the whole year is 17°C. August is the hottest month, with highs of about 29°C; January is the coldest, with lows of about 8°C.