St. Louis weather in July: St. Louis, Missouri: normal highs, lows, rain and records for July
St. Louis in July has a normal high of 90°F and a normal low of 71°F, a daily mean of 80°F, holding near 90°F all month. Measurable precipitation falls on 9 days in a normal July, 3.93 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 32°C and low of 22°C, 100 mm of precipitation in July.
- NOAA stationSt Louis Lambert International Airport
- Station IDUSW00013994
- Location38.75°N 90.37°W
- Elevation531 ft (162 m)
- From the center11 miles
- Population279,695
- Jan 40° 24°
- Feb 46° 28°
- Mar 57° 37°
- Apr 68° 47°
- May 77° 58°
- Jun 86° 67°
- Jul 90° 71°
- Aug 88° 69°
- Sep 81° 61°
- Oct 69° 49°
- Nov 56° 37°
- Dec 45° 29°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is St. Louis in July?
The normal high is 90°F and the normal low 71°F, for a daily mean of 80.4°F. July is 3.9°F warmer than June and 1.6°F warmer than August. July is the warmest month of the year in St. Louis and the 4th wettest. Across the month the normal high rises 1°F, from 89°F on July 1 to 90°F on July 31. From one year to the next July's mean temperature typically moves about 2.7°F either way (NOAA's standard deviation), so roughly two Julys in three average between 78°F and 83°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 31%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| July 1 | 89°F | 70°F | 31% | 21% |
| July 8 | 90°F | 71°F | 30% | 20% |
| July 15 | 90°F | 71°F | 29% | 19% |
| July 22 | 90°F | 71°F | 28% | 19% |
| July 31 | 90°F | 71°F | 28% | 18% |
Every day of July: normal high, low and chance of precipitation (warmest afternoon July 15, coldest night July 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| July 1 | 89°F | 70°F | 31% | 21% | 14 h 50 min |
| July 2 | 89°F | 70°F | 31% | 21% | 14 h 50 min |
| July 3 | 89°F | 71°F | 31% | 21% | 14 h 50 min |
| July 4 | 89°F | 71°F | 30% | 21% | 14 h 50 min |
| July 5 | 89°F | 71°F | 30% | 21% | 14 h 50 min |
| July 6 | 89°F | 71°F | 30% | 20% | 14 h 50 min |
| July 7 | 90°F | 71°F | 30% | 20% | 14 h 50 min |
| July 8 | 90°F | 71°F | 30% | 20% | 14 h 50 min |
| July 9 | 90°F | 71°F | 29% | 20% | 14 h 40 min |
| July 10 | 90°F | 71°F | 29% | 20% | 14 h 40 min |
| July 11 | 90°F | 71°F | 29% | 20% | 14 h 40 min |
| July 12 | 90°F | 71°F | 29% | 20% | 14 h 40 min |
| July 13 | 90°F | 71°F | 29% | 19% | 14 h 40 min |
| July 14 | 90°F | 71°F | 29% | 19% | 14 h 40 min |
| July 15 | 90°F | 71°F | 29% | 19% | 14 h 40 min |
| July 16 | 90°F | 71°F | 29% | 19% | 14 h 40 min |
| July 17 | 90°F | 71°F | 29% | 19% | 14 h 40 min |
| July 18 | 90°F | 71°F | 28% | 19% | 14 h 30 min |
| July 19 | 90°F | 71°F | 28% | 19% | 14 h 30 min |
| July 20 | 90°F | 71°F | 28% | 19% | 14 h 30 min |
| July 21 | 90°F | 71°F | 28% | 19% | 14 h 30 min |
| July 22 | 90°F | 71°F | 28% | 19% | 14 h 30 min |
| July 23 | 90°F | 71°F | 28% | 19% | 14 h 30 min |
| July 24 | 90°F | 71°F | 28% | 19% | 14 h 30 min |
| July 25 | 90°F | 71°F | 28% | 19% | 14 h 20 min |
| July 26 | 90°F | 71°F | 28% | 18% | 14 h 20 min |
| July 27 | 90°F | 71°F | 28% | 18% | 14 h 20 min |
| July 28 | 90°F | 71°F | 28% | 18% | 14 h 20 min |
| July 29 | 90°F | 71°F | 28% | 18% | 14 h 20 min |
| July 30 | 90°F | 71°F | 28% | 18% | 14 h 20 min |
| July 31 | 90°F | 71°F | 28% | 18% | 14 h 10 min |
- Normal high
- 90°FJuly average
- Normal low
- 71°FJuly average
- Precipitation
- 3.93 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 16
- Daylight
- 14 h 50 min to 14 h 10 minJuly 1 to July 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 29
- Sunshine
- 82%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013994; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in St. Louis in July?
On a given July day the chance of 0.01 inch or more is 29% on average, highest around July 1 (31%). In all, 3.93 in falls on 9 days of a normal July, 1 of them with an inch or more.
In a normal July in St. Louis, 16 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013994.
How humid and windy is St. Louis in July?
At 3 p.m. the normal temperature is 87°F with 49% relative humidity and a dew point of 65°F; at 6 a.m. it is 73°F with 81% humidity. The wind averages 7.1 mph, most often from the west-northwest in the afternoon. A dew point of 65°F or more feels muggy to most people.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 73°F | 66°F | 81% | 5.3 mph | 33% |
| 9 a.m. | 80°F | 67°F | 64% | 7.3 mph | 36% |
| noon | 85°F | 66°F | 53% | 8.3 mph | 20% |
| 3 p.m. | 87°F | 65°F | 49% | 9.1 mph | – |
| 6 p.m. | 84°F | 66°F | 54% | 9.0 mph | 27% |
| 9 p.m. | 79°F | 67°F | 66% | 6.7 mph | 50% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00013994. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for July in St. Louis?
The warmest July temperature on St. Louis's official record (since 1874) is 115°F, on July 14, 1954; the coldest is 51°F, on July 27, 1962. The wettest July brought 12.69 in (1948).
The July mean against the 1991-2020 normal of 80.4°F: 2021 79.6°F (−0.8), 2022 82.8°F (+2.4), 2023 81.5°F (+1.1), 2024 79.7°F (−0.7), 2025 82.3°F (+1.9), 2026 80.5°F (+0.1). 4 of 6 ran warmer than normal.
| July | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 79.6°F | −0.8°F | 5.95 in |
| 2022 | 82.8°F | +2.4°F | 12.22 in |
| 2023 | 81.5°F | +1.1°F | 4.74 in |
| 2024 | 79.7°F | −0.7°F | 8.39 in |
| 2025 | 82.3°F | +1.9°F | 4.58 in |
| 2026 | 80.5°F | +0.1°F | 7.47 in |
Source: records: ACIS, NWS threaded record STLthr; recent months: ACIS, station USW00013994. Records and recent months use complete months only.
How does July in St. Louis compare across Missouri?
Across the 134 places PlainClimate covers in Missouri, July normal highs run from 85°F in Canton to 92°F in Malden; St. Louis's is 90°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.