St. Louis weather in April: St. Louis, Missouri: normal highs, lows, rain and records for April
St. Louis in April has a normal high of 68°F and a normal low of 47°F, a daily mean of 58°F, rising from 63°F on the 1st to 73°F by the 30th. Measurable precipitation falls on 12 days in a normal April, 4.73 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 20°C and low of 8°C, 120 mm of precipitation and 1 cm of snow in April.
- 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 April?
The normal high is 68°F and the normal low 47°F, for a daily mean of 57.5°F. April is 10.9°F warmer than March and 10.0°F cooler than May. April is the 7th warmest month of the year in St. Louis and the 2nd 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 3.3°F either way (NOAA's standard deviation), so roughly two Aprils in three average between 54°F and 61°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 42%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| April 1 | 63°F | 42°F | 36% | 24% |
| April 8 | 66°F | 44°F | 37% | 25% |
| April 15 | 68°F | 47°F | 39% | 26% |
| April 22 | 70°F | 49°F | 40% | 27% |
| April 30 | 73°F | 52°F | 42% | 28% |
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 | 42°F | 36% | 24% | 12 h 40 min |
| April 2 | 63°F | 42°F | 37% | 24% | 12 h 40 min |
| April 3 | 64°F | 43°F | 37% | 24% | 12 h 40 min |
| April 4 | 64°F | 43°F | 37% | 25% | 12 h 40 min |
| April 5 | 64°F | 43°F | 37% | 25% | 12 h 50 min |
| April 6 | 65°F | 44°F | 37% | 25% | 12 h 50 min |
| April 7 | 65°F | 44°F | 37% | 25% | 12 h 50 min |
| April 8 | 66°F | 44°F | 37% | 25% | 12 h 50 min |
| April 9 | 66°F | 45°F | 37% | 25% | 13 h |
| April 10 | 66°F | 45°F | 38% | 25% | 13 h |
| April 11 | 67°F | 45°F | 38% | 25% | 13 h |
| April 12 | 67°F | 46°F | 38% | 25% | 13 h |
| April 13 | 67°F | 46°F | 38% | 26% | 13 h 10 min |
| April 14 | 68°F | 46°F | 38% | 26% | 13 h 10 min |
| April 15 | 68°F | 47°F | 39% | 26% | 13 h 10 min |
| April 16 | 68°F | 47°F | 39% | 26% | 13 h 10 min |
| April 17 | 69°F | 48°F | 39% | 26% | 13 h 20 min |
| April 18 | 69°F | 48°F | 39% | 26% | 13 h 20 min |
| April 19 | 69°F | 48°F | 40% | 26% | 13 h 20 min |
| April 20 | 70°F | 49°F | 40% | 26% | 13 h 20 min |
| April 21 | 70°F | 49°F | 40% | 27% | 13 h 20 min |
| April 22 | 70°F | 49°F | 40% | 27% | 13 h 30 min |
| April 23 | 71°F | 50°F | 40% | 27% | 13 h 30 min |
| April 24 | 71°F | 50°F | 41% | 27% | 13 h 30 min |
| April 25 | 71°F | 51°F | 41% | 27% | 13 h 30 min |
| April 26 | 71°F | 51°F | 41% | 27% | 13 h 40 min |
| April 27 | 72°F | 51°F | 41% | 27% | 13 h 40 min |
| April 28 | 72°F | 52°F | 41% | 27% | 13 h 40 min |
| April 29 | 72°F | 52°F | 41% | 28% | 13 h 40 min |
| April 30 | 73°F | 52°F | 42% | 28% | 13 h 50 min |
- Normal high
- 68°FApril average
- Normal low
- 47°FApril average
- Precipitation
- 4.73 inmonth total
- Days with precipitation
- 120.01 inch or more
- Snowfall
- 0.2 inmonth total
- Nights at 32°F or colder
- 1
- 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 USW00013994; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in St. Louis in April?
On a given April day the chance of 0.01 inch or more is 39% on average, highest around April 30 (42%). In all, 4.73 in falls on 12 days of a normal April, 1 of them with an inch or more.
In a normal April in St. Louis, 1 nights fall to freezing and snowfall averages 0.2 inches.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013994.
How humid and windy is St. Louis in April?
At 3 p.m. the normal temperature is 69°F with 48% relative humidity and a dew point of 49°F; at 6 a.m. it is 55°F with 76% humidity. The wind averages 9.6 mph, most often from the southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 55°F | 48°F | 76% | 7.7 mph | 22% |
| 9 a.m. | 62°F | 49°F | 62% | 10.7 mph | 28% |
| noon | 67°F | 49°F | 52% | 11.5 mph | 19% |
| 3 p.m. | 69°F | 49°F | 48% | 12.0 mph | 18% |
| 6 p.m. | 67°F | 48°F | 51% | 11.0 mph | 19% |
| 9 p.m. | 62°F | 49°F | 62% | 8.4 mph | 37% |
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 April in St. Louis?
The warmest April temperature on St. Louis's official record (since 1874) is 93°F, on April 10, 1930; the coldest is 20°F, on April 3, 1936. The wettest April brought 10.85 in (2025); the snowiest, 6.5 inches (1971).
The April mean against the 1991-2020 normal of 57.5°F: 2021 57.1°F (−0.4), 2022 56.5°F (−1.0), 2023 58.5°F (+1.0), 2024 61.0°F (+3.5), 2025 59.6°F (+2.1), 2026 63.7°F (+6.2). 4 of 6 ran warmer than normal.
| April | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 57.1°F | −0.4°F | 4.10 in |
| 2022 | 56.5°F | −1.0°F | 3.40 in |
| 2023 | 58.5°F | +1.0°F | 2.57 in |
| 2024 | 61.0°F | +3.5°F | 8.16 in |
| 2025 | 59.6°F | +2.1°F | 10.85 in |
| 2026 | 63.7°F | +6.2°F | 6.88 in |
Source: records: ACIS, NWS threaded record STLthr; recent months: ACIS, station USW00013994. Records and recent months use complete months only.
How does April in St. Louis 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. Louis's is 68°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.