St. Louis, MO 14-Day Forecast
Missouri, United States 🇺🇸
93°
Sunny right now
Today: high 99°, low 70°
Updated 3 hours ago
St. Louis weather for the next 14 days
Thursday, August 27
Sunny High 88° Low 70°Precipitation
3%
· 0.0 in
Max wind
8 mph
Humidity
55%
UV index
8 - High
Sunrise / sunset
06:25 AM / 07:38 PM
Friday, August 28
Sunny High 88° Low 69°Precipitation
3%
· 0.0 in
Max wind
8 mph
Humidity
58%
UV index
8 - Very High
Sunrise / sunset
06:26 AM / 07:37 PM
Saturday, August 29
Overcast High 91° Low 69°Precipitation
7%
· 0.0 in
Max wind
11 mph
Humidity
47%
UV index
8 - Very High
Sunrise / sunset
06:27 AM / 07:35 PM
Sunday, August 30
Sunny High 100° Low 75°Precipitation
3%
· 0.0 in
Max wind
12 mph
Humidity
35%
UV index
9 - Very High
Sunrise / sunset
06:28 AM / 07:34 PM
Monday, August 31
Sunny High 101° Low 78°Precipitation
3%
· 0.0 in
Max wind
12 mph
Humidity
36%
UV index
9 - Very High
Sunrise / sunset
06:29 AM / 07:33 PM
Tuesday, September 1
Sunny High 101° Low 81°Precipitation
1%
· 0.0 in
Max wind
11 mph
Humidity
38%
UV index
9 - Very High
Sunrise / sunset
06:30 AM / 07:31 PM
Wednesday, September 2
Patchy rain nearby High 100° Low 81°Precipitation
57%
· 0.06 in
Max wind
14 mph
Humidity
44%
UV index
9 - Very High
Sunrise / sunset
06:31 AM / 07:29 PM
Thursday, September 3
Patchy rain nearby High 99° Low 78°Precipitation
57%
· 0.06 in
Max wind
9 mph
Humidity
54%
UV index
9 - Very High
Sunrise / sunset
06:31 AM / 07:28 PM
Friday, September 4
Overcast High 85° Low 72°Precipitation
80%
· 0.21 in
Max wind
10 mph
Humidity
73%
UV index
6 - High
Sunrise / sunset
06:32 AM / 07:26 PM
Saturday, September 5
Sunny High 87° Low 70°Precipitation
78%
· 0.45 in
Max wind
12 mph
Humidity
76%
UV index
8 - Very High
Sunrise / sunset
06:33 AM / 07:25 PM
Sunday, September 6
Overcast High 86° Low 72°Precipitation
59%
· 0.06 in
Max wind
8 mph
Humidity
74%
UV index
7 - High
Sunrise / sunset
06:34 AM / 07:23 PM
Monday, September 7
Overcast High 99° Low 78°Precipitation
18%
· 0.01 in
Max wind
10 mph
Humidity
63%
UV index
9 - Very High
Sunrise / sunset
06:35 AM / 07:22 PM
Tuesday, September 8
Light rain shower High 79° Low 56°Precipitation
88%
· 0.27 in
Max wind
10 mph
Humidity
90%
UV index
4 - Moderate
Sunrise / sunset
06:36 AM / 07:20 PM
St. Louis 14-day outlook: the story
The warmest day of St. Louis's 14-day outlook is Tuesday, September 1 with a high near 101°F (38°C); the coolest night comes Tuesday, September 8, dipping to 56°F (13°C). The trend points cooler: week two runs about 4°F below week one. Highs over the next two weeks average 95°F (35°C), about 10°F (6°C) above the typical August high of 85°F (30°C).
Precipitation is most likely on Wednesday 2, Thursday 3, Friday 4, Saturday 5 and beyond; the wettest day looks like Saturday, September 5 with about 0.45 in (11.5 mm) expected. For the weekend, expect Saturday 91°F (33°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 6 of the next 14 days, peaking around Saturday, September 5.
What will be the warmest day in St. Louis over the next 14 days?
Tuesday, September 1, with a forecast high near 101°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% |