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Over 250 million face dangerous heat dome into 4th of July weekend. Click for details. Chevron right
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Union, MO

91°F
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Union, MO 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
Extreme Heat Warning

July

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
28
93°
75°
29
93°
75°
30
95°
75°
1
Sunny, hot and humid
95°
73°
2
An afternoon t-storm; humid
95°
74°
3
Some sun, a t-storm; humid
95°
71°
4
A stray afternoon t-storm
93°
71°
5
Very humid with some sun
90°
70°
6
A t-storm around in the p.m.
90°
72°
7
Humid with rain and a t-storm
90°
70°
8
Humid with a t-storm or two
91°
72°
9
A couple of showers; humid
92°
67°
10
An afternoon t-storm or two
89°
69°
11
Mostly cloudy, rain ending
93°
71°
12
Mostly cloudy
92°
72°
13
Partly sunny
93°
70°
14
Sunshine and humid
91°
68°
15
Plenty of sunshine
87°
64°
16
Plenty of sunshine
88°
65°
17
Mostly sunny
86°
64°
18
Times of clouds and sun
89°
68°
19
Mostly cloudy
93°
72°
20
Hot with some sun
94°
72°
21
Hot with sun and clouds
95°
71°
22
Wall-to-wall sunshine
94°
71°
23
An afternoon thunderstorm
94°
72°
24
Partly sunny, hot and humid
95°
72°
25
Partly sunny, hot and humid
95°
73°
26
Hot with plenty of sunshine
94°
73°
27
Mostly sunny, hot and humid
96°
72°
28
Sunny, hot and less humid
95°
73°
29
Sunny and hot
96°
72°
30
Hot with clouds and sun
95°
73°
31
A shower in the afternoon
95°
71°
1
Less humid with sunshine
93°
70°

Temperature Graph

°F
100° 92° 84° 76° 68° Jul
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 31
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo

July Weather in Union

Union's July 2026 forecast shows daily high temperatures ranging from 86° to 96°, with overnight lows between 64° and 74°. The average high for July is 93° with an average low of 71°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how July weather will actually feel in Union. See also: August | September | October.

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Weather Near Union:

  • O'Fallon, MO
  • St. Charles, MO
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