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Mount Vernon, IN

69°F
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Mount Vernon

Indiana

69°
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Mount Vernon, IN 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

September

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
30
96°
62°
31
97°
70°
1
100°
69°
2
100°
69°
3
102°
70°
4
102°
71°
5
103°
71°
6
92°
74°
7
Mostly sunny and less humid
88°
62°
8
Partly sunny and hot
93°
72°
9
Very hot; breezy in the a.m.
98°
72°
10
Cloudy, a thunderstorm; humid
81°
61°
11
Humid with some sun
85°
63°
12
Rain and a thunderstorm
89°
66°
13
Hot with plenty of sun
93°
67°
14
Sunshine, hot and humid
90°
66°
15
A t-storm around in the a.m.
84°
62°
16
Mostly sunny and less humid
82°
59°
17
Sunny and less humid
85°
62°
18
Mostly cloudy
85°
61°
19
Morning rain, then a shower
81°
60°
20
Mostly cloudy
80°
56°
21
Sunshine; warm, less humid
84°
61°
22
Thickening clouds
79°
61°
23
Mostly sunny
81°
60°
24
Mostly cloudy and warm
84°
61°
25
Cloudy and warm
84°
62°
26
Warm with sun and clouds
83°
61°
27
A passing afternoon shower
84°
61°
28
Mostly sunny, warm and humid
83°
60°
29
Mostly cloudy and warm
83°
61°
30
Mostly sunny, warm and humid
82°
61°
1
Warm with clouds; p.m. rain
81°
56°
2
Sunny and less humid
79°
50°
3
Sunny and not as warm
69°
46°

Temperature Graph

°F
110° 98° 86° 74° 62° Sep
Today 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
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo

September Weather in Mount Vernon

Mount Vernon's September 2026 forecast shows daily high temperatures ranging from 69° to 98°, with overnight lows between 46° and 72°. The average high for September is 84° with an average low of 61°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Mount Vernon. See also: October | November | December.

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December 2026

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World North America United States Indiana Mount Vernon

Weather Near Mount Vernon:

  • Evansville, IN
  • Henderson, KY
  • Owensboro, KY
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