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Pontoon Beach, IL

79°F
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Pontoon Beach

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79°
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Pontoon Beach, IL Weather
Today WinterCast Local {stormName} Tracker Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

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Today Hourly 10-Day Radar MinuteCast®

Monthly

Air Quality Health & Activities
Flood Watch

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
Sunny to partly cloudy
93°
76°
27
Hot with sunshine
94°
76°
28
Sunshine and hot
95°
75°
29
Mostly sunny, hot and humid
95°
76°
30
Mostly sunny, hot and humid
94°
75°
31
A t-storm around in the p.m.
92°
75°
1
Decreasing clouds and humid
93°
76°
2
Hot with plenty of sunshine
94°
76°
3
Sunny and toasty conditions
94°
75°
4
Mostly sunny and hot
95°
76°
5
Partly sunny and hot
94°
75°
6
Sunny and toasty conditions
93°
76°
7
Plenty of sunshine
90°
68°
8
Plenty of sunshine
90°
71°
9
Partly sunny
91°
66°
10
Partly sunny
87°
68°
11
Partial sunshine
85°
66°
12
Partial sunshine
87°
69°
13
Turning out cloudy
86°
71°
14
Cloudy with showers
85°
68°
15
Couple of thunderstorms
86°
72°
16
Couple of thunderstorms
91°
71°
17
Morning showers and t-storms
87°
68°
18
Couple of thunderstorms
87°
67°
19
Mostly cloudy, a few showers
84°
65°
20
A little a.m. rain; overcast
84°
65°
21
A thundershower in spots
85°
64°
22
Increasing amounts of sun
85°
66°
23
Plenty of sun
90°
70°
24
Humid with plenty of sun
91°
70°
25
Sunny, hot and very humid
92°
69°
26
Hot and humid with sunshine
91°
70°
27
An afternoon t-storm or two
90°
63°
28
A couple of afternoon showers
89°
64°
29
Partly sunny
84°
65°
30
A shower and thunderstorm
83°
64°
31
Cloudy, thunderstorms; humid
82°
62°
1
Partly sunny
83°
61°
2
Some sun with a stray shower
82°
61°
3
A sun-and-cloud mix
81°
60°
4
Sun and some clouds
81°
60°
5
Brilliant sunshine
82°
64°

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 Pontoon Beach

Pontoon Beach's August 2026 forecast shows daily high temperatures ranging from 81° to 95°, with overnight lows between 60° and 76°. The average high for August is 89° with an average low of 69°. 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 Pontoon Beach. See also: September | October | November.

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Weather Near Pontoon Beach:

  • O'Fallon, MO
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