5-day weather forecast St. Louis Oct 20, 2026
23°Weather forecast St. Louis tomorrow Oct 20, 2026: sunny, temperature from 13 °C to 23 °C.
Precipitation probability 11%. Wind up to 2.31 m/s (gusts 4.31 m/s). Air humidity 26–52%, atmospheric pressure 768–771 mm Hg, UV index up to 4.4.
5 days at a glance — tap a day to open it
Sunrise 07:15
Sunset 18:16
Sunset 18:16
Waxing Gibbous77% illuminated
Moonrise 15:40 · Moonset 01:40
Moonrise 15:40 · Moonset 01:40
Chart
Table
| Time | Weather | Temperature | Rain chance | Cloud cover | Humidity | Pressure | Wind | UV Index |
|---|---|---|---|---|---|---|---|---|
| 00:00 |  Overcast | 16 °C | 10% | 100% | 38% | 770 mm Hg | ESE 115° 1.61 (2.5) m/s | 0 |
| 01:00 | Overcast | 15 °C | 10% | 100% | 40% | 770 mm Hg | SE 129° 1.31 (1.33) m/s | 0 |
| 02:00 | Overcast | 15 °C | 9% | 94% | 42% | 770 mm Hg | ESE 120° 1.5 (1.5) m/s | 0 |
| 03:00 | Overcast | 14 °C | 11% | 100% | 44% | 770 mm Hg | ESE 110° 1.39 (1.5) m/s | 0 |
| 04:00 |  Cloudy | 14 °C | 9% | 82% | 47% | 770 mm Hg | ESE 108° 1.39 (1.39) m/s | 0 |
| 05:00 |  Partly cloudy | 14 °C | 4% | 39% | 49% | 770 mm Hg | ESE 109° 1.39 (1.39) m/s | 0 |
| 06:00 |  Clear | 13 °C | 2% | 5% | 51% | 770 mm Hg | E 100° 1.5 (1.5) m/s | 0 |
| 07:00 | Clear | 13 °C | 3% | 9% | 52% | 770 mm Hg | ESE 104° 1.69 (1.89) m/s | 0 |
| 08:00 | Sunny | 13 °C | 2% | 5% | 51% | 770 mm Hg | ESE 117° 1.61 (2.5) m/s | 0 |
| 09:00 | Sunny | 15 °C | 2% | 5% | 45% | 771 mm Hg | ESE 118° 1.81 (2.83) m/s | 0.5 |
| 10:00 | Sunny | 18 °C | 1% | 5% | 40% | 771 mm Hg | SE 132° 1.69 (2.42) m/s | 1.4 |
| 11:00 | Sunny | 19 °C | 1% | 5% | 35% | 770 mm Hg | SE 142° 1.61 (2) m/s | 2.8 |
| 12:00 | Sunny | 21 °C | 1% | 5% | 32% | 770 mm Hg | SE 139° 1.69 (1.83) m/s | 3.9 |
| 13:00 | Sunny | 22 °C | 1% | 5% | 29% | 770 mm Hg | SE 135° 1.61 (1.61) m/s | 4.4 |
| 14:00 | Sunny | 23 °C | 1% | 5% | 27% | 769 mm Hg | SE 130° 1.61 (1.69) m/s | 4 |
| 15:00 | Sunny | 23 °C | 1% | 5% | 26% | 769 mm Hg | ESE 120° 1.61 (1.61) m/s | 2.9 |
| 16:00 | Sunny | 23 °C | 1% | 5% | 26% | 768 mm Hg | ESE 119° 1.39 (1.61) m/s | 1.6 |
| 17:00 | Sunny | 23 °C | 1% | 5% | 27% | 768 mm Hg | ESE 114° 1.31 (1.64) m/s | 0.6 |
| 18:00 | Sunny | 21 °C | 1% | 5% | 31% | 768 mm Hg | E 87° 1.31 (1.39) m/s | 0 |
| 19:00 | Clear | 19 °C | 1% | 2% | 34% | 768 mm Hg | ENE 77° 1.69 (1.72) m/s | 0 |
| 20:00 | Clear | 18 °C | 1% | 0% | 37% | 769 mm Hg | E 79° 1.89 (2.64) m/s | 0 |
| 21:00 | Clear | 18 °C | 1% | 0% | 39% | 769 mm Hg | E 90° 1.89 (2.83) m/s | 0 |
| 22:00 | Clear | 17 °C | 1% | 0% | 40% | 769 mm Hg | ESE 102° 2.19 (4.11) m/s | 0 |
| 23:00 | Clear | 17 °C | 1% | 0% | 41% | 769 mm Hg | E 101° 2.31 (4.31) m/s | 0 |
St. Louis on the map
Data Sources & Methodology
Our weather forecasts are powered by a professional weather data provider that aggregates data from national weather services, satellite observations, radar networks, and over 80,000 weather stations worldwide. Forecast data is updated multiple times daily. We convert raw data into clear summaries — wind speed in m/s, pressure in mmHg — so you can plan your day with confidence.