10-day forecast · O'Fallon
Day-by-day outlook up to 14 days: highs, lows, precipitation totals, wind and UV. Planning further ahead? Open the 30-day outlook →
Tue · Today
Sunny
89°
62°
8%
⌄
Wind 7 mph SE
Gusts 17 mph
UV index 8 – Very high
Precip chance 8%
Sunrise 6:25 AM
Sunset 7:44 PM
Wed · Tomorrow
Sunny
90°
69°
0.07 in
⌄
Wind 7 mph SW
Gusts 18 mph
UV index 8 – Very high
Precip chance 57% · 0.07 in
Sunrise 6:26 AM
Sunset 7:42 PM
Thursday 27/8
Sunny
91°
70°
0.01 in
⌄
Wind 8 mph N
Gusts 19 mph
UV index 8 – High
Precip chance 17% · 0.01 in
Sunrise 6:27 AM
Sunset 7:41 PM
Friday 28/8
Sunny
91°
69°
3%
⌄
Wind 9 mph NE
Gusts 18 mph
UV index 8 – Very high
Precip chance 3%
Sunrise 6:28 AM
Sunset 7:39 PM
Saturday 29/8
Mostly cloudy
96°
68°
0.04 in
⌄
Wind 14 mph S
Gusts 35 mph
UV index 8 – Very high
Precip chance 45% · 0.04 in
Sunrise 6:29 AM
Sunset 7:38 PM
Sunday 30/8
Showers
103°
74°
0.20 in
⌄
Wind 15 mph SW
Gusts 36 mph
UV index 9 – Very high
Precip chance 66% · 0.20 in
Sunrise 6:30 AM
Sunset 7:36 PM
Monday 31/8
Showers
97°
75°
0.14 in
⌄
Wind 14 mph S
Gusts 37 mph
UV index 9 – Very high
Precip chance 64% · 0.14 in
Sunrise 6:31 AM
Sunset 7:35 PM
Tuesday 1/9
Sunny
87°
70°
0.09 in
⌄
Wind 13 mph NW
Gusts 31 mph
UV index 8 – Very high
Precip chance 57% · 0.09 in
Sunrise 6:31 AM
Sunset 7:33 PM
Wednesday 2/9
Sunny
87°
63°
5%
⌄
Wind 10 mph NE
Gusts 22 mph
UV index 8 – Very high
Precip chance 5%
Sunrise 6:32 AM
Sunset 7:32 PM
Thursday 3/9
Mostly cloudy
78°
61°
10%
⌄
Wind 15 mph SE
Gusts 27 mph
UV index 6 – High
Precip chance 10%
Sunrise 6:33 AM
Sunset 7:30 PM
Friday 4/9
Sunny
91°
56°
5%
⌄
Wind 13 mph W
Gusts 21 mph
UV index 8 – Very high
Precip chance 5%
Sunrise 6:34 AM
Sunset 7:29 PM
Saturday 5/9
Sunny
79°
56°
7%
⌄
Wind 10 mph E
Gusts 23 mph
UV index 7 – High
Precip chance 7%
Sunrise 6:35 AM
Sunset 7:27 PM
Sunday 6/9
Mostly cloudy
81°
58°
7%
⌄
Wind 13 mph SE
Gusts 28 mph
UV index 6 – High
Precip chance 7%
Sunrise 6:36 AM
Sunset 7:25 PM
Monday 7/9
Mostly cloudy
85°
63°
0.16 in
⌄
Wind 15 mph SE
Gusts 31 mph
UV index 6 – High
Precip chance 72% · 0.16 in
Sunrise 6:37 AM
Sunset 7:24 PM
10-day outlook for O'Fallon
Over the next ten days O'Fallon peaks at 103° on Sunday and bottoms out at 61° on Thursday. The back half cools off by roughly 6°, so the warmest days are the ones in front of you. Add it up and about 0.53 in of precipitation falls over the period, spread across 5 unsettled days, with Sunday the most likely (66%).