Annual mean 17°C · wettest around January · prevailing wind SW
Warmest
26.3 °C
Coldest
15.5 °C
Wettest
6%
Windiest
4.6 m/s
Prevailing
SW
4.0 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 Simi Valley over the whole year is 17°C. August is the hottest month, with highs of about 25°C; February is the coldest, with lows of about 10°C. Simi Valley 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 Simi Valley are highest in March, averaging 3.3 m/s (12 km/h), and lightest in September, at 2.7 m/s (10 km/h). The prevailing wind is from the SW. The clearest skies in Simi Valley come in November, when the sky is typically 20% covered; May is the cloudiest month, at 43%.
Month by month Simi Valley 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
10°C
13°C
6%
28%
3.0 m/s
43
1
82
February
16°C
10°C
13°C
5%
28%
3.1 m/s
43
3
80
March
16°C
10°C
13°C
6%
36%
3.3 m/s
43
2
82
April
18°C
12°C
16°C
2%
31%
3.2 m/s
63
6
84
May
19°C
14°C
17°C
1%
43%
3.1 m/s
77
8
85
June
22°C
17°C
21°C
0%
39%
3.1 m/s
85
22
70
July
25°C
19°C
25°C
0%
27%
3.0 m/s
73
42
46
August
25°C
19°C
26°C
0%
23%
2.9 m/s
70
49
38
September
25°C
18°C
24°C
0%
27%
2.7 m/s
75
41
46
October
23°C
16°C
21°C
1%
23%
2.7 m/s
82
25
64
November
20°C
12°C
17°C
2%
20%
2.7 m/s
73
8
82
December
17°C
10°C
14°C
6%
26%
2.9 m/s
51
1
84
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 Simi Valley weather by season
Year round, Simi Valley has days of about 16°C at their warmest in January, its coolest month, and 25°C in August, its warmest; the coolest hours of the day run from 10°C to 19°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.
Simi Valley weather in winterDecember to February
High 16°CLow 10°CRain 6%
Winter in Simi Valley has typical daily highs of about 16°C and lows of about 10°C, with a 6% chance of rain on a given day.
Simi Valley weather in springMarch to May
High 18°CLow 12°CRain 3%
Spring in Simi Valley has typical daily highs of about 18°C and lows of about 12°C, with a 3% chance of rain on a given day.
Simi Valley weather in summerJune to August
High 24°CLow 18°CRain 0%
Summer in Simi Valley has typical daily highs of about 24°C and lows of about 18°C, with a 0% chance of rain on a given day.
Simi Valley weather in autumnSeptember to November
High 22°CLow 15°CRain 1%
Autumn in Simi Valley has typical daily highs of about 22°C and lows of about 15°C, with a 1% chance of rain on a given day.
When is the rainy season in Simi Valley?
Simi Valley 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 Simi Valley windiest?
Winds in Simi Valley are highest in March, averaging 3.3 m/s (12 km/h), and lightest in September, at 2.7 m/s (10 km/h). The prevailing wind is from the SW.
What is the average temperature in Simi Valley year round?
The average temperature in Simi Valley over the whole year is 17°C. August is the hottest month, with highs of about 25°C; February is the coldest, with lows of about 10°C.