Annual mean 15°C · wettest around March · prevailing wind W
Warmest
24.6 °C
Coldest
11.5 °C
Wettest
50%
Windiest
5.0 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
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 Vallejo over the whole year is 15°C. August is the hottest month, with highs of about 24°C; December is the coldest, with lows of about 8°C. The rainy (wet) season in Vallejo runs from October to May, peaking in March with a 49% chance of rain on a given day. The dry season is June to September; July is the driest month, at 17%. Winds in Vallejo are highest in July, averaging 4.4 m/s (16 km/h), and lightest in November, at 2.3 m/s (8 km/h). The prevailing wind is from the W. The clearest skies in Vallejo come in June, when the sky is typically 13% covered; January is the cloudiest month, at 44%.
Month by month Vallejo 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
12°C
8°C
10°C
49%
44%
2.5 m/s
11
0
78
February
14°C
8°C
11°C
48%
29%
2.9 m/s
21
0
77
March
15°C
9°C
12°C
49%
39%
3.1 m/s
27
0
81
April
18°C
11°C
15°C
44%
26%
3.5 m/s
54
6
82
May
20°C
13°C
18°C
43%
23%
4.1 m/s
63
15
73
June
23°C
15°C
21°C
26%
13%
4.3 m/s
64
30
57
July
23°C
15°C
23°C
17%
15%
4.4 m/s
66
39
47
August
24°C
16°C
23°C
19%
17%
4.0 m/s
69
42
45
September
24°C
15°C
23°C
30%
18%
3.3 m/s
72
34
53
October
21°C
13°C
20°C
40%
19%
2.6 m/s
75
19
70
November
16°C
9°C
14°C
46%
29%
2.3 m/s
38
1
87
December
12°C
8°C
10°C
49%
42%
2.5 m/s
11
0
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 Vallejo weather by season
Year round, Vallejo has days of about 12°C at their warmest in December, its coolest month, and 24°C in August, its warmest; the coolest hours of the day run from 8°C to 16°C through the year, and the average temperature over the year is 15°C around the clock. Rain is most likely around March 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.
Vallejo weather in winterDecember to February
High 13°CLow 8°CRain 49%
Winter in Vallejo has typical daily highs of about 13°C and lows of about 8°C, with a 49% chance of rain on a given day.
Vallejo weather in springMarch to May
High 17°CLow 11°CRain 45%
Spring in Vallejo has typical daily highs of about 17°C and lows of about 11°C, with a 45% chance of rain on a given day.
Vallejo weather in summerJune to August
High 23°CLow 15°CRain 21%
Summer in Vallejo has typical daily highs of about 23°C and lows of about 15°C, with a 21% chance of rain on a given day.
Vallejo weather in autumnSeptember to November
High 20°CLow 13°CRain 39%
Autumn in Vallejo has typical daily highs of about 20°C and lows of about 13°C, with a 39% chance of rain on a given day.
When is the rainy season in Vallejo?
The rainy (wet) season in Vallejo runs from October to May, peaking in March with a 49% chance of rain on a given day. The dry season is June to September; July is the driest month, at 17%.
What time of year is Vallejo windiest?
Winds in Vallejo are highest in July, averaging 4.4 m/s (16 km/h), and lightest in November, at 2.3 m/s (8 km/h). The prevailing wind is from the W.
What is the average temperature in Vallejo year round?
The average temperature in Vallejo over the whole year is 15°C. August is the hottest month, with highs of about 24°C; December is the coldest, with lows of about 8°C.