5-day weather forecast St. Louis Oct 18, 2026
9°Weather forecast St. Louis today Oct 18, 2026: sunny, temperature from 9 °C to 20 °C.
Precipitation probability 1%. Wind up to 3.81 m/s (gusts 7.33 m/s). Air humidity 23–45%, atmospheric pressure 770–774 mm Hg, UV index up to 4.5.
5 days at a glance — tap a day to open it
Sunrise 07:13
Sunset 18:18
Sunset 18:18
First Quarter58% illuminated
Moonrise 14:46 · Moonset does not set today
Moonrise 14:46 · Moonset does not set today
Chart
Table
Sun, Oct 18, 2026
| Time | Weather | Temperature | Rain chance | Cloud cover | Humidity | Pressure | Wind | UV Index |
|---|---|---|---|---|---|---|---|---|
| 00:00 |  Clear | 11 °C | 1% | 0% | 43% | 773 mm Hg | SE 137° 2.5 (4.53) m/s | 0 |
| 01:00 | Clear | 11 °C | 1% | 0% | 44% | 773 mm Hg | SE 145° 2.39 (4.69) m/s | 0 |
| 02:00 | Clear | 10 °C | 1% | 0% | 45% | 773 mm Hg | SSE 151° 2.61 (4.83) m/s | 0 |
| 03:00 | Clear | 10 °C | 1% | 0% | 44% | 773 mm Hg | SSE 157° 2.69 (4.72) m/s | 0 |
| 04:00 | Clear | 10 °C | 1% | 0% | 43% | 773 mm Hg | SSE 162° 2.61 (4.72) m/s | 0 |
| 05:00 | Clear | 9 °C | 1% | 0% | 41% | 773 mm Hg | SSE 162° 2.61 (4.53) m/s | 0 |
| 06:00 | Clear | 9 °C | 1% | 0% | 39% | 773 mm Hg | SSE 162° 2.61 (4.72) m/s | 0 |
| 07:00 | Sunny | 9 °C | 1% | 0% | 38% | 774 mm Hg | SSE 166° 2.69 (4.83) m/s | 0 |
| 08:00 | Sunny | 9 °C | 1% | 0% | 37% | 774 mm Hg | SSE 164° 2.69 (5.03) m/s | 0 |
| 09:00 | Sunny | 11 °C | 1% | 0% | 33% | 774 mm Hg | SSE 167° 3.11 (5.33) m/s | 0.6 |
| 10:00 | Sunny | 13 °C | 1% | 0% | 31% | 774 mm Hg | S 169° 3.5 (5.72) m/s | 1.6 |
| 11:00 | Sunny | 15 °C | 1% | 0% | 29% | 773 mm Hg | SSE 166° 3.81 (5.61) m/s | 3 |
| 12:00 | Sunny | 16 °C | 0% | 0% | 26% | 773 mm Hg | S 169° 3.81 (5.31) m/s | 4.1 |
| 13:00 | Sunny | 18 °C | 0% | 0% | 24% | 773 mm Hg | S 172° 3.69 (5.03) m/s | 4.5 |
| 14:00 | Sunny | 19 °C | 0% | 0% | 23% | 771 mm Hg | S 173° 3.5 (4.61) m/s | 4.1 |
| 15:00 | Sunny | 20 °C | 0% | 0% | 23% | 770 mm Hg | SSE 167° 3.31 (4.42) m/s | 3 |
| 16:00 | Sunny | 20 °C | 0% | 0% | 23% | 770 mm Hg | SSE 164° 3.39 (4.53) m/s | 1.6 |
| 17:00 | Sunny | 19 °C | 0% | 0% | 26% | 770 mm Hg | SSE 160° 3.19 (4.61) m/s | 0.6 |
| 18:00 | Sunny | 18 °C | 1% | 0% | 30% | 770 mm Hg | SSE 147° 3 (5.11) m/s | 0 |
| 19:00 | Clear | 16 °C | 1% | 0% | 32% | 770 mm Hg | SE 143° 2.89 (6.22) m/s | 0 |
| 20:00 | Clear | 16 °C | 1% | 0% | 34% | 771 mm Hg | SE 146° 3 (7) m/s | 0 |
| 21:00 | Clear | 15 °C | 1% | 0% | 36% | 771 mm Hg | SSE 158° 3 (7.33) m/s | 0 |
| 22:00 | Clear | 15 °C | 1% | 5% | 38% | 771 mm Hg | SSE 167° 2.69 (6.33) m/s | 0 |
| 23:00 | Clear | 14 °C | 1% | 0% | 40% | 771 mm Hg | SSE 167° 2.39 (5.19) m/s | 0 |
Sun, Oct 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 9 to 25 °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 12%. 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 9 to 25 °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 4 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 12%) 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.
Will I need an umbrella or sunscreen in St. Louis this week?
Rain reaches a 12% chance across the next 5 days, so pack something waterproof for the wettest of them — the daily strip above shows which. Today’s UV index peaks at 4.5; sunscreen is worth it from about 3 upwards.
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.