St. Charles weather in April: St. Charles, Missouri: normal highs, lows, rain and records for April
St. Charles in April has a normal high of 68°F and a normal low of 45°F, a daily mean of 57°F, rising from 63°F on the 1st to 73°F by the 30th. Measurable precipitation falls on 11 days in a normal April, 4.24 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 20°C and low of 7°C, 108 mm of precipitation in April.
- 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 April?
The normal high is 68°F and the normal low 45°F, for a daily mean of 56.7°F. April is 11.3°F warmer than March and 9.9°F cooler than May. April is the 7th warmest month of the year in St. Charles and the 3rd wettest. Across the month the normal high rises 10°F, from 63°F on April 1 to 73°F on April 30. From one year to the next April's mean temperature typically moves about 3.0°F either way (NOAA's standard deviation), so roughly two Aprils in three average between 54°F and 60°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 38%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| April 1 | 63°F | 40°F | 36% | 22% |
| April 8 | 66°F | 42°F | 36% | 23% |
| April 15 | 68°F | 45°F | 36% | 24% |
| April 22 | 71°F | 48°F | 37% | 25% |
| April 30 | 73°F | 50°F | 38% | 25% |
Every day of April: normal high, low and chance of precipitation (warmest afternoon April 30, coldest night April 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| April 1 | 63°F | 40°F | 36% | 22% | 12 h 40 min |
| April 2 | 63°F | 40°F | 36% | 22% | 12 h 40 min |
| April 3 | 64°F | 40°F | 36% | 23% | 12 h 40 min |
| April 4 | 64°F | 41°F | 36% | 23% | 12 h 40 min |
| April 5 | 65°F | 41°F | 36% | 23% | 12 h 50 min |
| April 6 | 65°F | 42°F | 36% | 23% | 12 h 50 min |
| April 7 | 65°F | 42°F | 36% | 23% | 12 h 50 min |
| April 8 | 66°F | 42°F | 36% | 23% | 12 h 50 min |
| April 9 | 66°F | 43°F | 36% | 23% | 13 h |
| April 10 | 67°F | 43°F | 36% | 23% | 13 h |
| April 11 | 67°F | 43°F | 36% | 23% | 13 h |
| April 12 | 67°F | 44°F | 36% | 24% | 13 h |
| April 13 | 68°F | 44°F | 36% | 24% | 13 h 10 min |
| April 14 | 68°F | 45°F | 36% | 24% | 13 h 10 min |
| April 15 | 68°F | 45°F | 36% | 24% | 13 h 10 min |
| April 16 | 69°F | 45°F | 36% | 24% | 13 h 10 min |
| April 17 | 69°F | 46°F | 36% | 24% | 13 h 20 min |
| April 18 | 69°F | 46°F | 36% | 24% | 13 h 20 min |
| April 19 | 70°F | 46°F | 36% | 24% | 13 h 20 min |
| April 20 | 70°F | 47°F | 37% | 24% | 13 h 20 min |
| April 21 | 70°F | 47°F | 37% | 24% | 13 h 30 min |
| April 22 | 71°F | 48°F | 37% | 25% | 13 h 30 min |
| April 23 | 71°F | 48°F | 37% | 25% | 13 h 30 min |
| April 24 | 71°F | 48°F | 37% | 25% | 13 h 30 min |
| April 25 | 71°F | 49°F | 37% | 25% | 13 h 30 min |
| April 26 | 72°F | 49°F | 38% | 25% | 13 h 40 min |
| April 27 | 72°F | 49°F | 38% | 25% | 13 h 40 min |
| April 28 | 72°F | 50°F | 38% | 25% | 13 h 40 min |
| April 29 | 73°F | 50°F | 38% | 25% | 13 h 40 min |
| April 30 | 73°F | 50°F | 38% | 25% | 13 h 50 min |
- Normal high
- 68°FApril average
- Normal low
- 45°FApril average
- Precipitation
- 4.24 inmonth total
- Days with precipitation
- 110.01 inch or more
- Nights at 32°F or colder
- 2
- Daylight
- 12 h 40 min to 13 h 50 minApril 1 to April 30
- Days at 70°F or more
- 14
- Days at 80°F or more
- 5
- Sunshine
- 73%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 April?
On a given April day the chance of 0.01 inch or more is 37% on average, highest around April 30 (38%). In all, 4.24 in falls on 11 days of a normal April, 1 of them with an inch or more.
In a normal April in St. Charles, 2 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00053904.
What are the records for April in St. Charles?
The April mean against the 1991-2020 normal of 56.7°F: 2021 56.4°F (−0.3), 2022 54.6°F (−2.1), 2023 56.5°F (−0.3), 2024 58.7°F (+2.0), 2025 57.5°F (+0.8), 2026 62.3°F (+5.6). 3 of 6 ran warmer than normal.
| April | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 56.4°F | −0.3°F | 4.09 in |
| 2022 | 54.6°F | −2.1°F | 3.55 in |
| 2023 | 56.5°F | −0.3°F | 2.81 in |
| 2024 | 58.7°F | +2.0°F | 5.69 in |
| 2025 | 57.5°F | +0.8°F | 6.74 in |
| 2026 | 62.3°F | +5.6°F | 5.14 in |
Source: recent months: ACIS, station USW00053904. Records and recent months use complete months only.
How does April in St. Charles compare across Missouri?
Across the 134 places PlainClimate covers in Missouri, April normal highs run from 62°F in Unionville to 72°F in Marble Hill; St. Charles's is 68°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.