5-day weather forecast St. Louis 18-08-2026
Weather forecast St. Louis today 18.08.2026: sunny, temperature from 19 °C to 34 °C.
Precipitation probability 24%. Wind up to 3.31 m/s (gusts 8.11 m/s). Air humidity 36–95%, atmospheric pressure 759–764 mm Hg, UV index up to 8.9.
5 days at a glance — tap a day to open it
Sunrise 06:17
Sunset 19:51
Sunset 19:51
First Quarter37% illuminated
Moonrise 12:57 · Moonset 22:50
Moonrise 12:57 · Moonset 22:50
Chart
Table
Tue, Aug 18, 2026
| Temperature | Rain chance | Cloud cover | Humidity | Pressure | Wind | UV Index | ||
|---|---|---|---|---|---|---|---|---|
| 00:00 |  Clear | 21 °C | 8% | 2% | 78% | 764 mm Hg | ENE 74° 1.39 (2.22) m/s | 0 |
| 01:00 | Clear | 20 °C | 10% | 0% | 82% | 764 mm Hg | E 98° 1.39 (1.92) m/s | 0 |
| 02:00 | Clear | 20 °C | 12% | 1% | 87% | 764 mm Hg | ENE 68° 0.81 (0.81) m/s | 0 |
| 03:00 | Clear | 19 °C | 11% | 0% | 86% | 764 mm Hg | ENE 62° 1.19 (1.22) m/s | 0 |
| 04:00 | Clear | 19 °C | 12% | 1% | 87% | 764 mm Hg | WSW 246° 0.5 (0.61) m/s | 0 |
| 05:00 | Clear | 19 °C | 12% | 0% | 88% | 763 mm Hg | SW 226° 0.61 (0.72) m/s | 0 |
| 06:00 | Clear | 19 °C | 14% | 1% | 91% | 763 mm Hg | SSE 165° 1.31 (6.31) m/s | 0 |
| 07:00 |  Mist | 19 °C | 17% | 15% | 95% | 763 mm Hg | SSW 210° 1.5 (2.14) m/s | 0.2 |
| 08:00 |  Sunny | 21 °C | 14% | 3% | 92% | 763 mm Hg | SSW 208° 1.31 (2.11) m/s | 0.8 |
| 09:00 |  Overcast | 23 °C | 24% | 89% | 85% | 763 mm Hg | SSW 202° 1.89 (2.53) m/s | 2.1 |
| 10:00 | Sunny | 24 °C | 8% | 1% | 76% | 763 mm Hg | SW 224° 1.39 (1.75) m/s | 4.1 |
| 11:00 | Sunny | 29 °C | 4% | 4% | 65% | 763 mm Hg | SW 232° 1.39 (1.81) m/s | 6.4 |
| 12:00 | Sunny | 30 °C | 4% | 4% | 65% | 763 mm Hg | SSW 211° 1.81 (2.33) m/s | 8.2 |
| 13:00 | Sunny | 31 °C | 3% | 0% | 58% | 762 mm Hg | SW 236° 2 (2.61) m/s | 8.9 |
| 14:00 | Sunny | 33 °C | 2% | 1% | 49% | 761 mm Hg | W 259° 1.81 (2.61) m/s | 8.3 |
| 15:00 | Sunny | 34 °C | 1% | 0% | 45% | 761 mm Hg | WSW 258° 1.5 (2.64) m/s | 6.6 |
| 16:00 | Sunny | 34 °C | 1% | 0% | 41% | 760 mm Hg | WSW 258° 1 (2.33) m/s | 4.4 |
| 17:00 |  Partly cloudy | 32 °C | 3% | 41% | 36% | 760 mm Hg | ENE 57° 1.11 (1.61) m/s | 2.3 |
| 18:00 | Overcast | 31 °C | 10% | 100% | 37% | 760 mm Hg | ESE 123° 1.5 (3) m/s | 0.8 |
| 19:00 | Sunny | 30 °C | 2% | 15% | 42% | 759 mm Hg | ESE 121° 2.11 (4) m/s | 0.2 |
| 20:00 | Clear | 28 °C | 1% | 0% | 46% | 760 mm Hg | ESE 121° 3.31 (6.22) m/s | 0 |
| 21:00 | Clear | 26 °C | 3% | 0% | 60% | 760 mm Hg | SE 124° 3.11 (7.72) m/s | 0 |
| 22:00 | Clear | 26 °C | 4% | 0% | 66% | 760 mm Hg | SE 132° 2.81 (7.11) m/s | 0 |
| 23:00 | Clear | 25 °C | 5% | 0% | 70% | 760 mm Hg | SE 131° 3 (8.11) m/s | 0 |
Tue, Aug 18, 2026
Frequently asked questions about the 5-day weather in St. Louis
What will the weather be like in St. Louis over the next 5 days?
Over the next 5 days in St. Louis the temperature is expected to range from about 18 to 34 °C. See the detailed hourly forecast for each of the 5 days in the charts above.
On which of the next 5 days will it rain in St. Louis?
The chance of rain in St. Louis over the next 5 days reaches 55%. Check the 5-day precipitation chart above to see exactly which days and hours bring rain.
How accurate is the 5-day weather forecast for St. Louis?
A 5-day forecast is fairly reliable: the first 2–3 days are usually very accurate, while days 4–5 may be refined. The data is updated several times a day, so check back before important plans.
Which of the next 5 days in St. Louis will be the warmest and which the coolest?
Over the next 5 days the temperature in St. Louis ranges from about 18 to 34 °C. Compare the warmest and coolest day on the temperature chart above.
Will it be windy in St. Louis over the next 5 days?
Over the next 5 days the wind in St. Louis picks up to 7 m/s. The windiest days are easy to spot on the wind chart above.
Which day of the week in St. Louis is best for a walk or a trip?
For a walk or a trip, pick the days with the lowest chance of rain (up to 55%) and light wind — easy to compare on the 5-day charts above.
How can I best use the 5-day forecast for St. Louis?
The first 2–3 days are reliable enough for firm decisions, while days 4–5 are a guide that sharpens as they approach. The forecast is updated several times a day, so check again before important plans.
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.