S
M
T
W
T
F
S
26
55°
40°
27
56°
43°
28
46°
36°
29
63°
33°
30
60°
38°
1
61°
35°
2
70°
33°
3
75°
44°
4
80°
45°
5
53°
45°
6
61°
39°
7
75°
40°
8
78°
46°
9
78°
45°
10
74°
42°
11
83°
43°
12
81°
54°
13
82°
41°
14
85°
60°
15
94°
49°
16
87°
55°
17
91°
57°
18
54°
45°
19
62°
42°
20
61°
48°
21
59°
49°
22
65°
47°
23
74°
53°
24
79°
58°
25
82°
58°
26
83°
59°
27
78°
58°
28
80°
60°
29
78°
60°
30
78°
59°
31
80°
57°
1
84°
58°
2
79°
61°
3
74°
58°
4
76°
62°
5
81°
63°
6
83°
64°
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 59° to 84°, with overnight lows between 42° and 64°. The average high for May is 76° with an average low of 57°. 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.
