Richland, WA Weather

Richland receives about 7 inches (180 mm) of precipitation per year, giving it a semi-arid desert climate and resulting in a shrub-steppe environment. Summers are hot with infrequent thunderstorms, while winters are milder than all of Eastern Washington with snow falling only occasionally.

Average Temperature
Jan
39 °F
4 °C
Feb
30 °F
-1 °C
Mar
43 °F
6 °C
Apr
64 °F
18 °C
May
73 °F
23 °C
Jun
82 °F
28 °C
Jul
84 °F
29 °C
Aug
86 °F
30 °C
Sep
75 °F
24 °C
Oct
59 °F
15 °C
Nov
46 °F
8 °C
Dec
39 °F
4 °C
Humidity
Jan
82%
Feb
83%
Mar
77%
Apr
54%
May
48%
Jun
39%
Jul
40%
Aug
43%
Sep
54%
Oct
53%
Nov
76%
Dec
84%
Rain
Jan
21mm
Feb
32mm
Mar
15mm
Apr
16mm
May
17mm
Jun
9mm
Jul
8mm
Aug
14mm
Sep
11mm
Oct
14mm
Nov
7mm
Dec
17mm
Clouds
Jan
73%
Feb
80%
Mar
39%
Apr
49%
May
21%
Jun
16%
Jul
7%
Aug
6%
Sep
24%
Oct
27%
Nov
49%
Dec
71%
Air quality US AQI
Jan
25
Feb
20
Mar
15
Apr
12
May
17
Jun
14
Jul
23
Aug
40
Sep
19
Oct
21
Nov
37
Dec
36
Sun
Jan
1UVI
Feb
2UVI
Mar
3UVI
Apr
5UVI
May
6UVI
Jun
8UVI
Jul
8UVI
Aug
7UVI
Sep
5UVI
Oct
3UVI
Nov
2UVI
Dec
1UVI