Annual mean 18°C · wettest around March · prevailing wind W
Warmest
33.6 °C
Coldest
15.5 °C
Wettest
42%
Windiest
3.8 m/s
Prevailing
W
3.1 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 Rialto over the whole year is 18°C. July is the hottest month, with highs of about 33°C; January is the coldest, with lows of about 7°C. The rainy (wet) season in Rialto runs from October to May, peaking in March with a 38% chance of rain on a given day. The dry season is June to September; July is the driest month, at 15%. Winds in Rialto are highest in May, averaging 3.1 m/s (11 km/h), and lightest in December, at 1.8 m/s (6 km/h). The prevailing wind is from the W. The clearest skies in Rialto come in August, when the sky is typically 13% covered; March is the cloudiest month, at 37%.
Month by month Rialto 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
7°C
13°C
37%
30%
2.1 m/s
39
1
79
February
17°C
7°C
13°C
37%
29%
2.3 m/s
45
3
75
March
18°C
8°C
14°C
38%
37%
2.6 m/s
50
6
75
April
22°C
11°C
19°C
30%
30%
2.9 m/s
70
17
70
May
24°C
14°C
21°C
28%
33%
3.1 m/s
76
24
63
June
29°C
18°C
26°C
19%
21%
3.1 m/s
54
56
27
July
33°C
20°C
31°C
15%
13%
2.9 m/s
20
66
5
August
33°C
20°C
31°C
25%
13%
2.7 m/s
18
67
5
September
30°C
17°C
28°C
19%
20%
2.4 m/s
44
57
19
October
27°C
14°C
23°C
27%
19%
2.2 m/s
65
42
44
November
22°C
9°C
18°C
30%
20%
2.0 m/s
69
14
71
December
17°C
7°C
14°C
36%
27%
1.8 m/s
47
1
81
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 Rialto weather by season
Year round, Rialto has days of about 16°C at their warmest in January, its coolest month, and 33°C in July, its warmest; the coolest hours of the day run from 7°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 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.
Rialto weather in winterDecember to February
High 17°CLow 7°CRain 37%
Winter in Rialto has typical daily highs of about 17°C and lows of about 7°C, with a 37% chance of rain on a given day.
Rialto weather in springMarch to May
High 21°CLow 11°CRain 32%
Spring in Rialto has typical daily highs of about 21°C and lows of about 11°C, with a 32% chance of rain on a given day.
Rialto weather in summerJune to August
High 32°CLow 19°CRain 20%
Summer in Rialto has typical daily highs of about 32°C and lows of about 19°C, with a 20% chance of rain on a given day.
Rialto weather in autumnSeptember to November
High 26°CLow 13°CRain 25%
Autumn in Rialto has typical daily highs of about 26°C and lows of about 13°C, with a 25% chance of rain on a given day.
When is the rainy season in Rialto?
The rainy (wet) season in Rialto runs from October to May, peaking in March with a 38% chance of rain on a given day. The dry season is June to September; July is the driest month, at 15%.
What time of year is Rialto windiest?
Winds in Rialto are highest in May, averaging 3.1 m/s (11 km/h), and lightest in December, at 1.8 m/s (6 km/h). The prevailing wind is from the W.
What is the average temperature in Rialto year round?
The average temperature in Rialto over the whole year is 18°C. July is the hottest month, with highs of about 33°C; January is the coldest, with lows of about 7°C.