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7 Days
14 Days
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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Mercedes, TX
Content continues below
May
Average Temperature
High
31°
Feels 34
Low
22°
Feels 23
Average Precipitation
13 Days
Rain amount
87mm
Snow amount
0cm
Content continues below
Daily Historical Averages
May 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
33°
19
34°
20
32°
21
31°
22
31°
23
31°
24
31°
25
32°
26
32°
27
32°
28
31°
29
31°
30
31°
31
31°
Forecast
Monday, May 18, 2026
Day
33°
Feels 37
Wind
30 km/h S
Gust
45 km/h
Humidity
48%
P.O.P
40%
Rain
~1 mm
Night
27°
Feels 30
Wind
28 km/h SE
Gust
42 km/h
Humidity
90%
P.O.P
30%
Historical Averages
May 18
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.