St. Louis, MO 14-Day Forecast
Missouri, United States 🇺🇸
91°
Sunny right now
Today: high 100°, low 75°
Updated 2 min ago
St. Louis weather for the next 14 days
Wednesday, September 16
Sunny High 96° Low 75°Precipitation
69%
· 0.34 in
Max wind
8 mph
Humidity
65%
UV index
7 - High
Sunrise / sunset
06:43 AM / 07:08 PM
Thursday, September 17
Sunny High 99° Low 79°Precipitation
57%
· 0.05 in
Max wind
7 mph
Humidity
54%
UV index
7 - High
Sunrise / sunset
06:44 AM / 07:06 PM
Friday, September 18
Sunny High 99° Low 77°Precipitation
4%
· 0.0 in
Max wind
11 mph
Humidity
55%
UV index
7 - High
Sunrise / sunset
06:45 AM / 07:04 PM
Saturday, September 19
Overcast High 100° Low 81°Precipitation
6%
· 0.0 in
Max wind
9 mph
Humidity
36%
UV index
6 - High
Sunrise / sunset
06:45 AM / 07:03 PM
Sunday, September 20
Sunny High 100° Low 80°Precipitation
2%
· 0.0 in
Max wind
9 mph
Humidity
32%
UV index
9 - Very High
Sunrise / sunset
06:46 AM / 07:01 PM
Monday, September 21
Overcast High 92° Low 73°Precipitation
6%
· 0.0 in
Max wind
12 mph
Humidity
51%
UV index
8 - Very High
Sunrise / sunset
06:47 AM / 07:00 PM
Tuesday, September 22
Overcast High 91° Low 67°Precipitation
6%
· 0.0 in
Max wind
9 mph
Humidity
50%
UV index
8 - Very High
Sunrise / sunset
06:48 AM / 06:58 PM
Wednesday, September 23
Overcast High 93° Low 74°Precipitation
36%
· 0.02 in
Max wind
10 mph
Humidity
54%
UV index
8 - Very High
Sunrise / sunset
06:49 AM / 06:56 PM
Thursday, September 24
Light rain shower High 77° Low 64°Precipitation
86%
· 0.43 in
Max wind
12 mph
Humidity
78%
UV index
5 - Moderate
Sunrise / sunset
06:50 AM / 06:55 PM
Friday, September 25
Patchy rain nearby High 76° Low 60°Precipitation
70%
· 0.14 in
Max wind
11 mph
Humidity
75%
UV index
6 - High
Sunrise / sunset
06:51 AM / 06:53 PM
Saturday, September 26
Sunny High 79° Low 60°Precipitation
4%
· 0.0 in
Max wind
11 mph
Humidity
62%
UV index
7 - High
Sunrise / sunset
06:52 AM / 06:52 PM
Sunday, September 27
Overcast High 65° Low 56°Precipitation
19%
· 0.0 in
Max wind
9 mph
Humidity
68%
UV index
5 - Moderate
Sunrise / sunset
06:53 AM / 06:50 PM
Monday, September 28
Sunny High 69° Low 51°Precipitation
3%
· 0.0 in
Max wind
6 mph
Humidity
46%
UV index
6 - High
Sunrise / sunset
06:54 AM / 06:48 PM
St. Louis 14-day outlook: the story
The warmest day of St. Louis's 14-day outlook is Tuesday, September 15 with a high near 100°F (38°C); the coolest night comes Monday, September 28, dipping to 51°F (11°C). The trend points cooler: week two runs about 19°F below week one. Highs over the next two weeks average 98°F (37°C), about 16°F (9°C) above the typical September high of 82°F (28°C).
Precipitation is most likely on Tuesday 15, Wednesday 16, Thursday 17, Thursday 24 and beyond; the wettest day looks like Thursday, September 24 with about 0.43 in (10.9 mm) expected. For the weekend, expect Saturday 100°F (38°C) and overcast / Sunday 100°F (38°C) and sunny.
For typical conditions month by month, see the St. Louis climate & average temperatures guide.
St. Louis forecast questions
Will it rain in St. Louis this week?
The forecast currently shows meaningful precipitation chances on 5 of the next 14 days, peaking around Thursday, September 24.
What will be the warmest day in St. Louis over the next 14 days?
Tuesday, September 15, with a forecast high near 100°F (38°C).
How accurate is a 14-day forecast for St. Louis?
Days 1-3 are highly reliable, days 4-7 capture the overall pattern well, and days 8-14 indicate trends rather than exact figures - check back as the date approaches; this page refreshes throughout the day.
Average temperatures in St. Louis by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 41° | 25° | 9 | 3.2 in | 5.7 h/day | 69% |
| February | 46° | 27° | 8 | 2.7 in | 7.1 h/day | 66% |
| March | 57° | 38° | 13 | 5.5 in | 7.5 h/day | 67% |
| April | 66° | 46° | 11 | 5.0 in | 9.0 h/day | 65% |
| May | 76° | 58° | 14 | 5.4 in | 10.2 h/day | 71% |
| June | 86° | 67° | 11 | 4.5 in | 11.6 h/day | 68% |
| July | 88° | 71° | 13 | 6.9 in | 11.8 h/day | 73% |
| August | 85° | 69° | 13 | 5.4 in | 11.0 h/day | 74% |
| September | 82° | 63° | 8 | 4.7 in | 10.2 h/day | 69% |
| October | 69° | 51° | 9 | 3.6 in | 8.1 h/day | 67% |
| November | 55° | 38° | 9 | 3.3 in | 7.0 h/day | 69% |
| December | 47° | 31° | 8 | 3.2 in | 6.0 h/day | 71% |