St. Charles weather in July: St. Charles, Missouri: normal highs, lows, rain and records for July
St. Charles in July has a normal high of 89°F and a normal low of 68°F, a daily mean of 79°F, holding near 89°F all month. Measurable precipitation falls on 9 days in a normal July, 3.74 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 32°C and low of 20°C, 95 mm of precipitation in July.
- NOAA stationSt Charles County Airport
- Station IDUSW00053904
- Location38.93°N 90.43°W
- Elevation436 ft (133 m)
- Population72,458
- Jan 40° 22°
- Feb 45° 26°
- Mar 56° 34°
- Apr 68° 45°
- May 77° 56°
- Jun 86° 65°
- Jul 89° 68°
- Aug 88° 66°
- Sep 81° 57°
- Oct 69° 46°
- Nov 55° 35°
- Dec 44° 27°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is St. Charles in July?
The normal high is 89°F and the normal low 68°F, for a daily mean of 78.6°F. July is 3.2°F warmer than June and 1.7°F warmer than August. July is the warmest month of the year in St. Charles and the 4th wettest. From one year to the next July's mean temperature typically moves about 2.5°F either way (NOAA's standard deviation), so roughly two Julys in three average between 76°F and 81°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 33%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| July 1 | 89°F | 68°F | 33% | 21% |
| July 8 | 89°F | 68°F | 31% | 20% |
| July 15 | 89°F | 68°F | 30% | 18% |
| July 22 | 89°F | 68°F | 29% | 18% |
| July 31 | 89°F | 68°F | 29% | 17% |
Every day of July: normal high, low and chance of precipitation (warmest afternoon July 8, coldest night July 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| July 1 | 89°F | 68°F | 33% | 21% | 14 h 50 min |
| July 2 | 89°F | 68°F | 33% | 21% | 14 h 50 min |
| July 3 | 89°F | 68°F | 33% | 21% | 14 h 50 min |
| July 4 | 89°F | 68°F | 32% | 21% | 14 h 50 min |
| July 5 | 89°F | 68°F | 32% | 20% | 14 h 50 min |
| July 6 | 89°F | 68°F | 32% | 20% | 14 h 50 min |
| July 7 | 89°F | 68°F | 31% | 20% | 14 h 50 min |
| July 8 | 89°F | 68°F | 31% | 20% | 14 h 50 min |
| July 9 | 89°F | 68°F | 31% | 20% | 14 h 50 min |
| July 10 | 89°F | 68°F | 31% | 19% | 14 h 50 min |
| July 11 | 89°F | 68°F | 30% | 19% | 14 h 40 min |
| July 12 | 89°F | 68°F | 30% | 19% | 14 h 40 min |
| July 13 | 89°F | 68°F | 30% | 19% | 14 h 40 min |
| July 14 | 89°F | 68°F | 30% | 19% | 14 h 40 min |
| July 15 | 89°F | 68°F | 30% | 18% | 14 h 40 min |
| July 16 | 89°F | 68°F | 29% | 18% | 14 h 40 min |
| July 17 | 89°F | 68°F | 29% | 18% | 14 h 40 min |
| July 18 | 89°F | 68°F | 29% | 18% | 14 h 40 min |
| July 19 | 89°F | 68°F | 29% | 18% | 14 h 30 min |
| July 20 | 89°F | 68°F | 29% | 18% | 14 h 30 min |
| July 21 | 89°F | 68°F | 29% | 18% | 14 h 30 min |
| July 22 | 89°F | 68°F | 29% | 18% | 14 h 30 min |
| July 23 | 89°F | 68°F | 29% | 18% | 14 h 30 min |
| July 24 | 89°F | 68°F | 29% | 17% | 14 h 30 min |
| July 25 | 89°F | 68°F | 29% | 17% | 14 h 30 min |
| July 26 | 89°F | 68°F | 29% | 17% | 14 h 20 min |
| July 27 | 89°F | 68°F | 29% | 17% | 14 h 20 min |
| July 28 | 89°F | 68°F | 29% | 17% | 14 h 20 min |
| July 29 | 89°F | 68°F | 29% | 17% | 14 h 20 min |
| July 30 | 89°F | 68°F | 29% | 17% | 14 h 20 min |
| July 31 | 89°F | 68°F | 29% | 17% | 14 h 10 min |
- Normal high
- 89°FJuly average
- Normal low
- 68°FJuly average
- Precipitation
- 3.74 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 15
- 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 USW00053904; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in St. Charles in July?
On a given July day the chance of 0.01 inch or more is 30% on average, highest around July 1 (33%). In all, 3.74 in falls on 9 days of a normal July, 1 of them with an inch or more.
In a normal July in St. Charles, 15 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00053904.
What are the records for July in St. Charles?
The July mean against the 1991-2020 normal of 78.6°F: 2021 78.2°F (−0.4), 2022 80.0°F (+1.5), 2023 78.4°F (−0.2), 2024 77.6°F (−1.0), 2025 80.7°F (+2.1), 2026 79.6°F (+1.0). 3 of 6 ran warmer than normal.
| July | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 78.2°F | −0.4°F | 4.18 in |
| 2022 | 80.0°F | +1.5°F | 7.17 in |
| 2023 | 78.4°F | −0.2°F | 4.30 in |
| 2024 | 77.6°F | −1.0°F | 9.70 in |
| 2025 | 80.7°F | +2.1°F | 6.31 in |
| 2026 | 79.6°F | +1.0°F | 3.45 in |
Source: recent months: ACIS, station USW00053904. Records and recent months use complete months only.
How does July in St. Charles 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. Charles's is 89°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.