Annual mean 18°C · wettest around January · prevailing wind SW
Warmest
30.1 °C
Coldest
16.8 °C
Wettest
19%
Windiest
3.7 m/s
Prevailing
SW
2.8 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 Fullerton over the whole year is 18°C. August is the hottest month, with highs of about 29°C; January is the coldest, with lows of about 9°C. The rainy (wet) season in Fullerton runs from October to March, peaking in January with a 17% chance of rain on a given day. The dry season is April to September; July is the driest month, at 2%. Winds in Fullerton are highest in May, averaging 2.4 m/s (9 km/h), and lightest in December, at 1.4 m/s (5 km/h). The prevailing wind is from the SW. The clearest skies in Fullerton come in August, when the sky is typically 22% covered; May is the cloudiest month, at 49%.
Month by month Fullerton 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
17°C
9°C
15°C
17%
32%
1.6 m/s
55
2
86
February
18°C
10°C
15°C
17%
32%
1.9 m/s
56
5
81
March
19°C
11°C
16°C
15%
40%
2.2 m/s
60
5
82
April
21°C
13°C
19°C
9%
37%
2.3 m/s
76
13
77
May
22°C
15°C
20°C
8%
49%
2.4 m/s
83
13
76
June
25°C
18°C
24°C
4%
40%
2.4 m/s
77
39
49
July
28°C
20°C
27°C
2%
24%
2.4 m/s
53
65
20
August
29°C
20°C
29°C
7%
22%
2.2 m/s
44
71
13
September
28°C
19°C
27°C
5%
29%
2.0 m/s
57
56
24
October
26°C
16°C
24°C
10%
27%
1.7 m/s
74
42
45
November
22°C
12°C
20°C
11%
23%
1.5 m/s
82
14
74
December
18°C
10°C
16°C
15%
29%
1.4 m/s
63
2
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 Fullerton weather by season
Year round, Fullerton has days of about 17°C at their warmest in January, its coolest month, and 29°C in August, its warmest; the coolest hours of the day run from 9°C to 20°C through the year, and the average temperature over the year is 18°C around the clock. Rain is most likely around January 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.
Fullerton weather in winterDecember to February
High 18°CLow 9°CRain 16%
Winter in Fullerton has typical daily highs of about 18°C and lows of about 9°C, with a 16% chance of rain on a given day.
Fullerton weather in springMarch to May
High 21°CLow 13°CRain 11%
Spring in Fullerton has typical daily highs of about 21°C and lows of about 13°C, with a 11% chance of rain on a given day.
Fullerton weather in summerJune to August
High 27°CLow 19°CRain 4%
Summer in Fullerton has typical daily highs of about 27°C and lows of about 19°C, with a 4% chance of rain on a given day.
Fullerton weather in autumnSeptember to November
High 25°CLow 16°CRain 9%
Autumn in Fullerton has typical daily highs of about 25°C and lows of about 16°C, with a 9% chance of rain on a given day.
When is the rainy season in Fullerton?
The rainy (wet) season in Fullerton runs from October to March, peaking in January with a 17% chance of rain on a given day. The dry season is April to September; July is the driest month, at 2%.
What time of year is Fullerton windiest?
Winds in Fullerton are highest in May, averaging 2.4 m/s (9 km/h), and lightest in December, at 1.4 m/s (5 km/h). The prevailing wind is from the SW.
What is the average temperature in Fullerton year round?
The average temperature in Fullerton over the whole year is 18°C. August is the hottest month, with highs of about 29°C; January is the coldest, with lows of about 9°C.