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Dupo, IL

93°F
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Dupo

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Dupo, IL Weather
Today WinterCast Local {stormName} Tracker Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

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Monthly

Air Quality Health & Activities
2
Extreme Heat Warning

August

January February March April May June July August September October November December

2026

2025 2026 2027

10-Day

S
M
T
W
T
F
S
26
Humid with plenty of sun
92°
74°
27
Hot and humid with sunshine
93°
73°
28
Sunny, hot and less humid
93°
74°
29
Sunlit and toasty conditions
94°
72°
30
Hot with sun and clouds
92°
73°
31
Hot with clouds and sun
93°
73°
1
Sunny
91°
71°
2
Increasing cloudiness
85°
68°
3
Cloudy, afternoon t-storms
85°
70°
4
Cloudy with thunderstorms
84°
70°
5
Sunshine and a few clouds
84°
69°
6
Sunny and humid
86°
71°
7
Sunny and humid
87°
71°
8
Partly sunny
87°
70°
9
Plenty of sunshine
88°
71°
10
An afternoon t-storm; humid
89°
71°
11
Mostly cloudy and humid
86°
70°
12
Humid with sunny spells
87°
71°
13
Mostly cloudy and humid
89°
71°
14
Mostly sunny
92°
70°
15
Hot with lots of sun
92°
70°
16
Humid with a t-storm or two
91°
69°
17
Humid; a p.m. t-storm or two
90°
70°
18
A couple of t-storms; humid
86°
69°
19
Humid; a p.m. t-storm or two
90°
63°
20
Partly sunny and not as hot
84°
62°
21
Clouds and sun; low humidity
82°
61°
22
Plenty of sunshine
81°
62°
23
Plenty of sunshine
82°
62°
24
Decreasing clouds
83°
63°
25
Plenty of sun
83°
68°
26
Mostly sunny
85°
64°
27
Mostly sunny
90°
68°
28
Partly sunny and humid
89°
68°
29
Mostly sunny and hot
91°
67°
30
Mostly sunny and warm
91°
68°
31
Mostly sunny
88°
67°
1
Clouds and sun
82°
65°
2
A t-storm around in the p.m.
83°
60°
3
Morning thunderstorms
80°
60°
4
Partial sunshine
80°
64°
5
Mostly sunny
82°
67°

Temperature Graph

°F
100° 92° 84° 76° 68° Aug
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo

August Weather in Dupo

Dupo's August 2026 forecast shows daily high temperatures ranging from 80° to 94°, with overnight lows between 60° and 74°. The average high for August is 87° with an average low of 68°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Dupo. See also: September | October | November.

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Weather Near Dupo:

  • O'Fallon, MO
  • St. Charles, MO
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