Waterloo weather in April: Waterloo, Iowa: normal highs, lows, rain and records for April
Waterloo in April has a normal high of 61°F and a normal low of 38°F, a daily mean of 49°F, rising from 55°F on the 1st to 67°F by the 30th. Measurable precipitation falls on 12 days in a normal April, 4.04 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 16°C and low of 3°C, 103 mm of precipitation and 4 cm of snow in April.
- NOAA stationWaterloo Municipal Airport
- Station IDUSW00094910
- Location42.55°N 92.40°W
- Elevation868 ft (265 m)
- Population67,477
- Jan 28° 11°
- Feb 33° 15°
- Mar 47° 27°
- Apr 61° 38°
- May 73° 50°
- Jun 82° 61°
- Jul 85° 64°
- Aug 83° 61°
- Sep 77° 52°
- Oct 63° 40°
- Nov 47° 28°
- Dec 34° 17°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Waterloo in April?
The normal high is 61°F and the normal low 38°F, for a daily mean of 49.4°F. April is 12.7°F warmer than March and 12.1°F cooler than May. April is the 7th warmest month of the year in Waterloo and the 5th wettest. Across the month the normal high rises 12°F, from 55°F on April 1 to 67°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 46°F and 53°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 40%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| April 1 | 55°F | 33°F | 35% | 19% |
| April 8 | 58°F | 35°F | 37% | 21% |
| April 15 | 61°F | 38°F | 38% | 24% |
| April 22 | 64°F | 40°F | 39% | 25% |
| April 30 | 67°F | 44°F | 40% | 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 | 55°F | 33°F | 35% | 19% | 12 h 40 min |
| April 2 | 55°F | 33°F | 35% | 20% | 12 h 40 min |
| April 3 | 56°F | 33°F | 36% | 20% | 12 h 50 min |
| April 4 | 56°F | 34°F | 36% | 20% | 12 h 50 min |
| April 5 | 57°F | 34°F | 36% | 20% | 12 h 50 min |
| April 6 | 57°F | 34°F | 36% | 21% | 12 h 50 min |
| April 7 | 58°F | 35°F | 37% | 21% | 13 h |
| April 8 | 58°F | 35°F | 37% | 21% | 13 h |
| April 9 | 58°F | 35°F | 37% | 22% | 13 h |
| April 10 | 59°F | 36°F | 37% | 22% | 13 h 10 min |
| April 11 | 59°F | 36°F | 38% | 22% | 13 h 10 min |
| April 12 | 60°F | 37°F | 38% | 23% | 13 h 10 min |
| April 13 | 60°F | 37°F | 38% | 23% | 13 h 10 min |
| April 14 | 60°F | 37°F | 38% | 23% | 13 h 20 min |
| April 15 | 61°F | 38°F | 38% | 24% | 13 h 20 min |
| April 16 | 61°F | 38°F | 39% | 24% | 13 h 20 min |
| April 17 | 62°F | 38°F | 39% | 24% | 13 h 30 min |
| April 18 | 62°F | 39°F | 39% | 24% | 13 h 30 min |
| April 19 | 62°F | 39°F | 39% | 24% | 13 h 30 min |
| April 20 | 63°F | 40°F | 39% | 25% | 13 h 30 min |
| April 21 | 63°F | 40°F | 39% | 25% | 13 h 40 min |
| April 22 | 64°F | 40°F | 39% | 25% | 13 h 40 min |
| April 23 | 64°F | 41°F | 39% | 25% | 13 h 40 min |
| April 24 | 64°F | 41°F | 39% | 25% | 13 h 40 min |
| April 25 | 65°F | 42°F | 40% | 25% | 13 h 50 min |
| April 26 | 65°F | 42°F | 40% | 25% | 13 h 50 min |
| April 27 | 66°F | 42°F | 40% | 25% | 13 h 50 min |
| April 28 | 66°F | 43°F | 40% | 25% | 13 h 50 min |
| April 29 | 66°F | 43°F | 40% | 25% | 14 h |
| April 30 | 67°F | 44°F | 40% | 25% | 14 h |
- Normal high
- 61°FApril average
- Normal low
- 38°FApril average
- Precipitation
- 4.04 inmonth total
- Days with precipitation
- 120.01 inch or more
- Snowfall
- 1.7 inmonth total
- Nights at 32°F or colder
- 10
- Daylight
- 12 h 40 min to 14 hApril 1 to April 30
- Days at 70°F or more
- 7
- Days at 80°F or more
- 2
- Sunshine
- 69%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094910; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Waterloo in April?
On a given April day the chance of 0.01 inch or more is 38% on average, highest around April 30 (40%). In all, 4.04 in falls on 12 days of a normal April, 1 of them with an inch or more.
In a normal April in Waterloo, 10 nights fall to freezing and snowfall averages 1.7 inches.
Snow falls on 1 day in a normal April, and an inch or more covers the ground on 1 day.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094910.
How humid and windy is Waterloo in April?
At 3 p.m. the normal temperature is 63°F with 45% relative humidity and a dew point of 41°F; at 6 a.m. it is 46°F with 81% humidity. The wind averages 11.2 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. | 46°F | 40°F | 81% | 8.6 mph | 50% |
| 9 a.m. | 55°F | 42°F | 61% | 12.6 mph | 56% |
| noon | 61°F | 41°F | 49% | 14.1 mph | 48% |
| 3 p.m. | 63°F | 41°F | 45% | 14.5 mph | 50% |
| 6 p.m. | 61°F | 41°F | 48% | 12.9 mph | 49% |
| 9 p.m. | 54°F | 42°F | 64% | 9.5 mph | 59% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094910. 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 Waterloo?
The warmest April temperature on Waterloo's official record (since 1895) is 100°F, on April 22, 1980; the coldest is −4°F, on April 6, 1982. The wettest April brought 10.79 in (2008); the snowiest, 12.1 inches (2018).
The April mean against the 1991-2020 normal of 49.4°F: 2021 50.8°F (+1.4), 2022 44.5°F (−4.9), 2023 50.3°F (+0.9), 2024 50.8°F (+1.4), 2025 50.0°F (+0.6), 2026 51.9°F (+2.5). 5 of 6 ran warmer than normal.
| April | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 50.8°F | +1.4°F | 0.46 in |
| 2022 | 44.5°F | −4.9°F | 4.03 in |
| 2023 | 50.3°F | +0.9°F | 1.23 in |
| 2024 | 50.8°F | +1.4°F | 3.98 in |
| 2025 | 50.0°F | +0.6°F | 5.75 in |
| 2026 | 51.9°F | +2.5°F | 5.80 in |
Source: records: ACIS, NWS threaded record ALOthr; recent months: ACIS, station USW00094910. Records and recent months use complete months only.
How does April in Waterloo compare across Iowa?
Across the 132 places PlainClimate covers in Iowa, April normal highs run from 54°F in Northwood to 64°F in Glenwood; Waterloo's is 61°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.