S
M
T
W
T
F
S
26
66°
32°
27
69°
38°
28
66°
39°
29
71°
44°
30
75°
41°
1
79°
36°
2
84°
52°
3
85°
50°
4
87°
50°
5
83°
64°
6
86°
50°
7
78°
51°
8
79°
46°
9
77°
47°
10
79°
46°
11
76°
46°
12
85°
45°
13
68°
47°
14
72°
44°
15
70°
45°
16
66°
39°
17
68°
41°
18
73°
48°
19
74°
47°
20
79°
50°
21
82°
53°
22
80°
53°
23
80°
51°
24
75°
50°
25
75°
50°
26
76°
49°
27
71°
54°
28
74°
52°
29
77°
55°
30
71°
52°
31
80°
57°
1
81°
57°
2
76°
56°
3
75°
53°
4
72°
51°
5
71°
51°
6
71°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Prosser
Prosser's May 2026 forecast shows daily high temperatures ranging from 66° to 82°, with overnight lows between 39° and 57°. The average high for May is 74° with an average low of 50°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Prosser. See also: June | July | August.
