Annual mean 21°C · wettest around January · prevailing wind E
Warmest
39.1 °C
Coldest
11.9 °C
Wettest
18%
Windiest
5.2 m/s
Prevailing
E
4.3 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 Boulder City over the whole year is 21°C. July is the hottest month, with highs of about 39°C; January is the coldest, with lows of about 5°C. Boulder City has no sharply defined rainy season: the chance of rain on a given day runs from 4% in June, the driest month, to 15% in January, the wettest. Winds in Boulder City are highest in April, averaging 4.2 m/s (15 km/h), and lightest in December, at 2.8 m/s (10 km/h). The prevailing wind is from the E. The clearest skies in Boulder City come in June, when the sky is typically 7% covered; March is the cloudiest month, at 24%.
Month by month Boulder City 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
13°C
5°C
8°C
15%
24%
3.0 m/s
5
0
60
February
15°C
7°C
9°C
15%
21%
3.6 m/s
20
0
65
March
19°C
10°C
13°C
13%
24%
4.1 m/s
38
2
75
April
25°C
15°C
19°C
14%
15%
4.2 m/s
69
16
68
May
29°C
20°C
23°C
9%
13%
4.1 m/s
65
43
42
June
37°C
27°C
31°C
4%
7%
4.2 m/s
24
55
7
July
39°C
29°C
35°C
11%
10%
3.9 m/s
4
32
0
August
38°C
28°C
34°C
12%
11%
3.6 m/s
5
39
1
September
33°C
22°C
29°C
11%
9%
3.3 m/s
36
60
13
October
26°C
15°C
21°C
10%
10%
3.2 m/s
71
31
54
November
19°C
9°C
13°C
9%
14%
3.1 m/s
42
1
78
December
13°C
5°C
9°C
12%
22%
2.8 m/s
9
0
65
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 Boulder City weather by season
Year round, Boulder City has days of about 13°C at their warmest in January, its coolest month, and 39°C in July, its warmest; the coolest hours of the day run from 5°C to 29°C through the year, and the average temperature over the year is 21°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.
Boulder City weather in winterDecember to February
High 14°CLow 6°CRain 14%
Winter in Boulder City has typical daily highs of about 14°C and lows of about 6°C, with a 14% chance of rain on a given day.
Boulder City weather in springMarch to May
High 24°CLow 15°CRain 12%
Spring in Boulder City has typical daily highs of about 24°C and lows of about 15°C, with a 12% chance of rain on a given day.
Boulder City weather in summerJune to August
High 38°CLow 28°CRain 9%
Summer in Boulder City has typical daily highs of about 38°C and lows of about 28°C, with a 9% chance of rain on a given day.
Boulder City weather in autumnSeptember to November
High 26°CLow 16°CRain 10%
Autumn in Boulder City has typical daily highs of about 26°C and lows of about 16°C, with a 10% chance of rain on a given day.
When is the rainy season in Boulder City?
Boulder City has no sharply defined rainy season: the chance of rain on a given day runs from 4% in June, the driest month, to 15% in January, the wettest.
What time of year is Boulder City windiest?
Winds in Boulder City are highest in April, averaging 4.2 m/s (15 km/h), and lightest in December, at 2.8 m/s (10 km/h). The prevailing wind is from the E.
What is the average temperature in Boulder City year round?
The average temperature in Boulder City over the whole year is 21°C. July is the hottest month, with highs of about 39°C; January is the coldest, with lows of about 5°C.