St. Charles weather in March: St. Charles, Missouri: normal highs, lows, rain and records for March
St. Charles in March has a normal high of 56°F and a normal low of 34°F, a daily mean of 45°F, rising from 50°F on the 1st to 63°F by the 31st. Measurable precipitation falls on 11 days in a normal March, 3.08 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 14°C and low of 1°C, 78 mm of precipitation in March.
- 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 March?
The normal high is 56°F and the normal low 34°F, for a daily mean of 45.4°F. March is 10.0°F warmer than February and 11.3°F cooler than April. March is the 8th warmest month of the year in St. Charles and the 7th wettest. Across the month the normal high rises 13°F, from 50°F on March 1 to 63°F on March 31. From one year to the next March's mean temperature typically moves about 4.4°F either way (NOAA's standard deviation), so roughly two Marchs in three average between 41°F and 50°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 36%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| March 1 | 50°F | 30°F | 29% | 16% |
| March 8 | 53°F | 32°F | 31% | 18% |
| March 15 | 56°F | 34°F | 33% | 19% |
| March 22 | 59°F | 36°F | 35% | 21% |
| March 31 | 63°F | 39°F | 36% | 22% |
Every day of March: normal high, low and chance of precipitation (warmest afternoon March 31, coldest night March 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| March 1 | 50°F | 30°F | 29% | 16% | 11 h 20 min |
| March 2 | 51°F | 30°F | 29% | 16% | 11 h 20 min |
| March 3 | 51°F | 30°F | 29% | 16% | 11 h 20 min |
| March 4 | 51°F | 31°F | 30% | 16% | 11 h 20 min |
| March 5 | 52°F | 31°F | 30% | 17% | 11 h 30 min |
| March 6 | 52°F | 31°F | 30% | 17% | 11 h 30 min |
| March 7 | 53°F | 32°F | 31% | 17% | 11 h 30 min |
| March 8 | 53°F | 32°F | 31% | 18% | 11 h 30 min |
| March 9 | 54°F | 32°F | 31% | 18% | 11 h 40 min |
| March 10 | 54°F | 33°F | 32% | 18% | 11 h 40 min |
| March 11 | 54°F | 33°F | 32% | 18% | 11 h 40 min |
| March 12 | 55°F | 33°F | 33% | 19% | 11 h 50 min |
| March 13 | 55°F | 33°F | 33% | 19% | 11 h 50 min |
| March 14 | 56°F | 34°F | 33% | 19% | 11 h 50 min |
| March 15 | 56°F | 34°F | 33% | 19% | 11 h 50 min |
| March 16 | 56°F | 34°F | 34% | 19% | 12 h |
| March 17 | 57°F | 35°F | 34% | 20% | 12 h |
| March 18 | 57°F | 35°F | 34% | 20% | 12 h |
| March 19 | 58°F | 35°F | 35% | 20% | 12 h |
| March 20 | 58°F | 36°F | 35% | 20% | 12 h 10 min |
| March 21 | 59°F | 36°F | 35% | 21% | 12 h 10 min |
| March 22 | 59°F | 36°F | 35% | 21% | 12 h 10 min |
| March 23 | 59°F | 37°F | 35% | 21% | 12 h 10 min |
| March 24 | 60°F | 37°F | 36% | 21% | 12 h 20 min |
| March 25 | 60°F | 37°F | 36% | 21% | 12 h 20 min |
| March 26 | 61°F | 38°F | 36% | 22% | 12 h 20 min |
| March 27 | 61°F | 38°F | 36% | 22% | 12 h 20 min |
| March 28 | 61°F | 38°F | 36% | 22% | 12 h 30 min |
| March 29 | 62°F | 39°F | 36% | 22% | 12 h 30 min |
| March 30 | 62°F | 39°F | 36% | 22% | 12 h 30 min |
| March 31 | 63°F | 39°F | 36% | 22% | 12 h 30 min |
- Normal high
- 56°FMarch average
- Normal low
- 34°FMarch average
- Precipitation
- 3.08 inmonth total
- Days with precipitation
- 110.01 inch or more
- Nights at 32°F or colder
- 14
- Daylight
- 11 h 20 min to 12 h 30 minMarch 1 to March 31
- Days at 70°F or more
- 5
- Days at 80°F or more
- 1
- Sunshine
- 67%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 March?
On a given March day the chance of 0.01 inch or more is 33% on average, highest around March 31 (36%). In all, 3.08 in falls on 11 days of a normal March, 1 of them with an inch or more.
In a normal March in St. Charles, 14 nights fall to freezing and 1 days stay below freezing all day.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00053904.
What are the records for March in St. Charles?
The March mean against the 1991-2020 normal of 45.4°F: 2021 51.0°F (+5.6), 2022 47.1°F (+1.7), 2023 43.8°F (−1.6), 2024 50.7°F (+5.3), 2025 51.2°F (+5.8), 2026 53.2°F (+7.8). 5 of 6 ran warmer than normal.
| March | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 51.0°F | +5.6°F | 5.29 in |
| 2022 | 47.1°F | +1.7°F | 4.11 in |
| 2023 | 43.8°F | −1.6°F | 2.79 in |
| 2024 | 50.7°F | +5.3°F | 2.06 in |
| 2025 | 51.2°F | +5.8°F | 2.85 in |
| 2026 | 53.2°F | +7.8°F | 3.88 in |
Source: recent months: ACIS, station USW00053904. Records and recent months use complete months only.
How does March in St. Charles compare across Missouri?
Across the 134 places PlainClimate covers in Missouri, March normal highs run from 50°F in Memphis to 61°F in Eminence; St. Charles's is 56°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.