Updated: June 26, 2017 4:25 pm
Next update: June 27, 2017 5:25 am

WXSIM Forecast for: O'Fallon

Tonight


Tuesday


Tuesday
night


Wednesday


Wednesday
night


Thursday


Thursday
night


Friday


70% Friday
night











2
3
7
12
13
10
10
10
5

Temperature/Precipitation/PressureThunder/Dewpoint/Pressure UV/Solar radiation Wind Max/min temperature
  Conditions Temperature Wind Precipitation UV Index Description and notes
Tonight
2
  Fair to partly cloudy in the evening, becoming clear after midnight. Unusually cool.
Tuesday
3
  UV
UV Index: 9
Sunny.
Tuesday night
7
  Clear in the evening, becoming mostly clear after midnight. Unusually cool.
Wednesday
12
  UV
UV Index: 8
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Breezy.
Wednesday night
13
  Partly cloudy. Breezy.
Thursday
10
<0.1 in
PoP: 30%
UV
UV Index: 7
Mostly cloudy in the morning, becoming partly cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon.
Scattered thunderstorms likely. Hot.
Heat index: 98°. Precipitation less than a tenth of an inch.
Thursday night
10
<0.1 in
PoP: 20%
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. A slight chance of rain.
Scattered thunderstorms likely. Precipitation less than a tenth of an inch.
Friday
10
<0.25 in
PoP: 60%
UV
UV Index: 6
Mostly cloudy in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon.

Heat index: 91°. Precipitation less than a quarter of an inch.
Friday night
5
0.25-0.5 in
PoP: 70%
Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. Rain likely.
Scattered thunderstorms likely. Precipitation mostly between a quarter and half an inch.
Saturday
5
  UV
UV Index: 7
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning.
Heat index: 92°.
Saturday night
2
  Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight.
Sunday
5
<0.1 in
PoP: 30%
UV
UV Index: 7
Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A slight chance of rain in the afternoon.
Scattered thunderstorms likely, some possibly severe.
Heat index: 92°. Precipitation less than a tenth of an inch.
Sunday night
4
0.25-0.5 in
PoP: 60%
Cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog. Rain likely in the evening, then a slight chance of rain after midnight.
Scattered thunderstorms likely. Precipitation mostly between a quarter and half an inch.
Move the mouse over the values for info.
  Conditions Temperature Wind Precipitation Pressure UV Index Description and notes
 05:39     20:32    Daylength: 14:53 Tomorrow
00:00
2
  30.12 in   Mostly clear.
03:00
1
  30.12 in   Clear.
06:00
2
  30.14 in UV
UV Index: 3
Sunny.
09:00
3
  30.17 in UV
UV Index: 9
Sunny.
12:00
3
  30.12 in UV
UV Index: 9
Sunny.
15:00
4
  30.06 in UV
UV Index: 5
Sunny.
18:00
4
  30.04 in   Sunny.
21:00
6
  30.02 in   Clear.
 05:40     20:32    Daylength: 14:52 Wednesday 28 Jun
00:00
8
  30.01 in   Clear.
03:00
8
  29.99 in   Mostly clear.
06:00
10
  29.97 in UV
UV Index: 3
Partly cloudy.
09:00
12
  29.98 in UV
UV Index: 8
Mostly cloudy.
12:00
Heat index:85F
13
  29.92 in UV
UV Index: 9
Partly cloudy.
15:00
Heat index:88F
14
  29.83 in UV
UV Index: 4
Mostly cloudy.
18:00
Heat index:88F
12
  29.81 in   Mostly cloudy.
21:00
14
  29.82 in   Mostly clear.
 05:40     20:32    Daylength: 14:52 Thursday 29 Jun
00:00
16
  29.82 in   Mostly clear.
03:00
11
  29.82 in   Partly cloudy.
06:00
9
  29.86 in UV
UV Index: 3
Partly cloudy.
09:00
12
  29.88 in UV
UV Index: 7
Mostly cloudy.
12:00
Heat index:96F
12
0.06 in 29.84 in UV
UV Index: 7
Mostly cloudy.
Light rain showers.
15:00
Heat index:98F
9
  29.80 in UV
UV Index: 5
Partly cloudy.
18:00
Heat index:98F
3
0.02 in 29.82 in   Mostly cloudy.
Light rain showers.
21:00
6
  29.85 in   Mostly cloudy.
 05:41     20:32    Daylength: 14:51 Friday 30 Jun
00:00
10
  29.84 in   Mostly cloudy.
03:00
10
  29.82 in   Partly cloudy.
Light fog.
06:00
10
  29.83 in UV
UV Index: 3
Mostly cloudy.
Light fog.
09:00
12
  29.86 in UV
UV Index: 6
Mostly cloudy.
12:00
11
0.01 in 29.84 in UV
UV Index: 6
Cloudy.
Light rain.
15:00
7
0.25 in 29.81 in UV
UV Index: 2
Cloudy.
Light rain.
18:00
7
0.04 in 29.87 in   Mostly cloudy.
Light rain showers.
21:00
6
0.19 in 29.89 in   Mostly cloudy.
Light rain showers.
 05:41     20:32    Daylength: 14:50 Saturday 01 Jul
00:00
5
0.01 in 29.89 in   Partly cloudy.
Light rain showers.
Moderate fog.
03:00
4
0.02 in 29.91 in   Partly cloudy.
Light rain showers.
06:00
5
  29.96 in UV
UV Index: 4
Mostly sunny.
09:00
4
  30.00 in UV
UV Index: 7
Mostly sunny.
12:00
5
  29.99 in UV
UV Index: 7
Mostly sunny.
15:00
6
  29.97 in UV
UV Index: 5
Sunny.
18:00
3
  29.99 in   Sunny.
21:00
1
  30.02 in   Mostly clear.
 05:42     20:32    Daylength: 14:50 Sunday 02 Jul
00:00
1
  30.01 in   Partly cloudy.
03:00
5
  30.02 in   Mostly cloudy.
06:00
4
  30.07 in UV
UV Index: 3
Mostly cloudy.
09:00
5
  30.08 in UV
UV Index: 7
Mostly cloudy.
12:00
5
  30.04 in UV
UV Index: 7
Mostly cloudy.
15:00
4
0.04 in 29.99 in UV
UV Index: 3
Mostly cloudy.
Light rain showers.
18:00
2
0.29 in 30.00 in   Mostly cloudy.
Light rain showers.
Move the mouse over the values for info.
  Conditions Temperature Wind Precipitation Thunderstorm probability Dewpoint Pressure UV Index Cloud cover Visibility
 05:39     20:32    Daylength: 14:53 Today
23:00
1
  0% 52.9° 30.11 in   13% 12 miles
 05:39     20:32    Daylength: 14:53 Tomorrow
00:00
2
  0% 52.4° 30.12 in   11% 11 miles
01:00
2
  0% 51.9° 30.13 in   9% 11 miles
02:00
2
  0% 51.6° 30.13 in   6% 11 miles
03:00
1
  0% 51.4° 30.12 in   4% 11 miles
04:00
1
  0% 51.0° 30.12 in   3% 11 miles
05:00
1
  0% 50.7° 30.12 in   3% 11 miles
06:00
2
  0% 52.7° 30.14 in UV
UV Index: 1
3% 11 miles
07:00
2
  0% 54.0° 30.15 in UV
UV Index: 2
2% 11 miles
08:00
2
  0% 54.8° 30.16 in UV
UV Index: 3
1% 11 miles
09:00
3
  0% 55.0° 30.17 in UV
UV Index: 6
0% 11 miles
10:00
3
  0% 55.0° 30.16 in UV
UV Index: 8
0% 11 miles
11:00
3
  0% 54.7° 30.14 in UV
UV Index: 9
0% 12 miles
12:00
3
  0% 54.5° 30.12 in UV
UV Index: 9
0% 12 miles
13:00
4
  0% 54.0° 30.09 in UV
UV Index: 8
0% 12 miles
14:00
4
  0% 53.7° 30.07 in UV
UV Index: 7
0% 12 miles
15:00
4
  0% 53.4° 30.06 in UV
UV Index: 5
0% 12 miles
16:00
5
  0% 53.6° 30.05 in UV
UV Index: 3
0% 13 miles
17:00
5
  0% 54.3° 30.05 in UV
UV Index: 1
0% 13 miles
18:00
4
  0% 55.1° 30.04 in   0% 13 miles
19:00
4
  0% 55.9° 30.03 in   0% 13 miles
20:00
5
  0% 56.3° 30.03 in   0% 13 miles
21:00
6
  0% 56.5° 30.02 in   0% 13 miles
22:00
7
  0% 56.7° 30.01 in   0% 12 miles
23:00
7
  0% 57.0° 30.01 in   0% 12 miles
 05:40     20:32    Daylength: 14:52 Wednesday 28 Jun
00:00
8
  0% 57.1° 30.01 in   0% 12 miles
01:00
8
  0% 57.0° 30.00 in   0% 12 miles
02:00
8
  0% 57.0° 30.00 in   1% 12 miles
03:00
8
  0% 57.0° 29.99 in   2% 12 miles
04:00
8
  0% 56.7° 29.99 in   5% 12 miles
05:00
9
  0% 56.5° 29.98 in   8% 12 miles
06:00
10
  0% 59.1° 29.97 in UV
UV Index: 1
17% 13 miles
07:00
11
  0% 60.4° 29.98 in UV
UV Index: 2
32% 13 miles
08:00
12
  0% 61.4° 29.98 in UV
UV Index: 3
48% 13 miles
09:00
12
  0% 62.1° 29.98 in UV
UV Index: 5
56% 13 miles
10:00
13
  0% 62.8° 29.97 in UV
UV Index: 7
48% 13 miles
11:00
Heat index:83F
13
  <20% 63.5° 29.95 in UV
UV Index: 8
36% 14 miles
12:00
Heat index:85F
13
  <20% 64.1° 29.92 in UV
UV Index: 9
33% 14 miles
13:00
Heat index:87F
13
  <20% 64.4° 29.87 in UV
UV Index: 8
31% 14 miles
14:00
Heat index:88F
13
  <20% 64.5° 29.85 in UV
UV Index: 6
26% 14 miles
15:00
Heat index:88F
14
  0% 64.1° 29.83 in UV
UV Index: 4
30% 15 miles
16:00
Heat index:88F
13
  <20% 63.4° 29.82 in UV
UV Index: 2
55% 15 miles
17:00
Heat index:88F
13
  <20% 62.8° 29.81 in UV
UV Index: 1
80% 15 miles
18:00
12
  20-40% 62.7° 29.81 in   93% 14 miles
19:00
12
  20-40% 63.2° 29.81 in   70% 14 miles
20:00
13
  <20% 63.6° 29.82 in   43% 14 miles
21:00
14
  <20% 63.7° 29.82 in   15% 14 miles
22:00
14
  <20% 63.7° 29.82 in   14% 14 miles
Move the mouse over the values for info.

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