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St Louis, MO Weather Forecast

View the 9-day weather forecast for St Louis, Missouri, including daily highs and lows, rain chances, rainfall amounts, wind speeds, humidity, and short-range versus extended OrbitalFusion guidance.

The latest 9-day OrbitalFusion forecast for St Louis, Missouri is in. The warmest stretch peaks on Wed near 96, while the coolest low settles in on Mon near 60. The best rain signal shows up on Sun at 70 percent and about 0.40 inches. The outlook starts with a near-term signal before shifting to extended signal later in the period.

Forecast data updated daily. Showing the latest available OrbitalFusion forecast for St Louis, Missouri.

Last updated:

Latest OrbitalFusion forecast loaded for St Louis, Missouri.

About OrbitalFusion
OrbitalFusion is an experimental forecast system developed by Engineer.Guide Research and Development Lab. Forecast pages are precomputed daily and refreshed on an automated schedule.

9-Day Outlook for St Louis, Missouri

A scan-first 9-day view generated for fast daily reading, with the main call for each day and the core details underneath.

OrbitalFusion Thunder Index is a 0-100 signal that blends near-term storm ingredients with extended pattern guidance.

Today's Weather Story
Today looks mostly cloudywith low rain chances, light wind, and humid air, and a minimal storm signal.
National Weather Service
Heat Advisory
Heat Advisory issued June 9 at 1:13AM CDT until June 9 at 10:00PM CDT by NWS St Louis MO
Moderate · Expected · Starts 2026-06-09T01:13:00-05:00 · Expires 2026-06-09T16:15:00-05:00
Check Hourly Timing
A quick look at the next several hours for temperature, rain chance, wind, and storm signal.
8 AM ET
78°
Mostly Cloudy
Precip 0% · Wind 9 mph
Minimal Storm Signal · Near-Term Signal
9 AM ET
80°
Mostly Cloudy
Precip 0% · Wind 9 mph
Minimal Storm Signal · Near-Term Signal
10 AM ET
83°
Sunny
Precip 0% · Wind 10 mph
Minimal Storm Signal · Near-Term Signal
11 AM ET
85°
Sunny
Precip 0% · Wind 9 mph
Minimal Storm Signal · Near-Term Signal
12 PM ET
85°
Sunny
Precip 0% · Wind 11 mph
Minimal Storm Signal · Near-Term Signal
1 PM ET
87°
Sunny
Precip 0% · Wind 11 mph
Minimal Storm Signal · Near-Term Signal
2 PM ET
89°
Sunny
Precip 0% · Wind 7 mph
Minimal Storm Signal · Near-Term Signal
3 PM ET
92°
Sunny
Precip 0% · Wind 8 mph
Minimal Storm Signal · Near-Term Signal
4 PM ET
94°
Partly Cloudy
Precip 0% · Wind 9 mph
Minimal Storm Signal · Near-Term Signal
5 PM ET
94°
Sunny
Precip 0% · Wind 10 mph
Minimal Storm Signal · Near-Term Signal
6 PM ET
93°
Sunny
Precip 0% · Wind 9 mph
Minimal Storm Signal · Near-Term Signal
7 PM ET
90°
Sunny
Precip 0% · Wind 7 mph
Minimal Storm Signal · Near-Term Signal
Tue
Jun 09
94°
Low 78°
Near-Term Signal
Mostly Cloudy
Precip 0% · Rain 0.00 in · Wind 11 mph · Humidity 87%
OrbitalFusion Thunder Index
0/100
Minimal Storm Signal
Storm Signal
Early guidance signal
Wed
Jun 10
96°
Low 75°
Near-Term Signal
Sunny
Precip 0% · Rain 0.00 in · Wind 16 mph · Humidity 92%
OrbitalFusion Thunder Index
0/100
Minimal Storm Signal
Storm Signal
Early guidance signal
Thu
Jun 11
91°
Low 79°
Extended Signal
Light rain possible
Precip 55% · Rain 0.27 in · Wind 13 mph · Humidity 82%
OrbitalFusion Thunder Index
49/100
Thunderstorm Possible
Storm Signal
Early guidance signal
Check hourly timing Radar near St Louis
Fri
Jun 12
82°
Low 68°
Extended Signal
Light rain possible
Precip 55% · Rain 0.30 in · Wind 8 mph · Humidity 89%
OrbitalFusion Thunder Index
43/100
Thunderstorm Possible
Storm Signal
Early guidance signal
Check hourly timing Radar near St Louis
Sat
Jun 13
79°
Low 67°
Extended Signal
Mostly quiet
Precip 35% · Rain 0.07 in · Wind 9 mph · Humidity 79%
OrbitalFusion Thunder Index
43/100
Thunderstorm Possible
Storm Signal
Early guidance signal
Check hourly timing Radar near St Louis
Sun
Jun 14
76°
Low 68°
Extended Signal
Light rain possible
Precip 70% · Rain 0.40 in · Wind 9 mph · Humidity 88%
OrbitalFusion Thunder Index
49/100
Thunderstorm Possible
Storm Signal
Early guidance signal
Check hourly timing Radar near St Louis
Mon
Jun 15
73°
Low 60°
Extended Signal
Mostly quiet
Precip 0% · Rain 0.00 in · Wind 5 mph · Humidity 79%
OrbitalFusion Thunder Index
1/100
Minimal Storm Signal
Storm Signal
Early guidance signal
Tue
Jun 16
72°
Low 64°
Extended Signal
Light rain possible
Precip 55% · Rain 0.16 in · Wind 7 mph · Humidity 85%
OrbitalFusion Thunder Index
45/100
Thunderstorm Possible
Storm Signal
Early guidance signal
Check hourly timing Radar near St Louis
Wed
Jun 17
73°
Low 60°
Extended Signal
Humid
Precip 35% · Rain 0.06 in · Wind 6 mph · Humidity 91%
OrbitalFusion Thunder Index
40/100
Thunderstorm Possible
Storm Signal
Early guidance signal
Check hourly timing Radar near St Louis
Official alerts, when active, come from the National Weather Service.

Nearby Forecasts

Quick links to a few nearby cities if you want to compare the next 9 days around St Louis, Missouri.

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