Waterloo weather in July: Waterloo, Iowa: normal highs, lows, rain and records for July
Waterloo in July has a normal high of 85°F and a normal low of 64°F, a daily mean of 75°F, holding near 85°F all month. Measurable precipitation falls on 9 days in a normal July, 4.34 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 29°C and low of 18°C, 110 mm of precipitation in July.
- 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 July?
The normal high is 85°F and the normal low 64°F, for a daily mean of 74.5°F. July is 3.0°F warmer than June and 2.6°F warmer than August. July is the warmest month of the year in Waterloo and the 3rd wettest. Across the month the normal high falls 1°F, from 85°F on July 1 to 84°F on July 31. From one year to the next July's mean temperature typically moves about 2.7°F either way (NOAA's standard deviation), so roughly two Julys in three average between 72°F and 77°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 34%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| July 1 | 85°F | 64°F | 34% | 23% |
| July 8 | 85°F | 64°F | 32% | 22% |
| July 15 | 85°F | 64°F | 30% | 20% |
| July 22 | 85°F | 64°F | 29% | 19% |
| July 31 | 84°F | 63°F | 28% | 19% |
Every day of July: normal high, low and chance of precipitation (warmest afternoon July 10, coldest night July 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| July 1 | 85°F | 64°F | 34% | 23% | 15 h 20 min |
| July 2 | 85°F | 64°F | 34% | 23% | 15 h 20 min |
| July 3 | 85°F | 64°F | 34% | 23% | 15 h 10 min |
| July 4 | 85°F | 64°F | 33% | 23% | 15 h 10 min |
| July 5 | 85°F | 64°F | 33% | 23% | 15 h 10 min |
| July 6 | 85°F | 64°F | 33% | 22% | 15 h 10 min |
| July 7 | 85°F | 64°F | 32% | 22% | 15 h 10 min |
| July 8 | 85°F | 64°F | 32% | 22% | 15 h 10 min |
| July 9 | 85°F | 64°F | 32% | 22% | 15 h 10 min |
| July 10 | 85°F | 64°F | 31% | 21% | 15 h 10 min |
| July 11 | 85°F | 64°F | 31% | 21% | 15 h 10 min |
| July 12 | 85°F | 64°F | 31% | 21% | 15 h 10 min |
| July 13 | 85°F | 64°F | 31% | 21% | 15 h |
| July 14 | 85°F | 64°F | 30% | 20% | 15 h |
| July 15 | 85°F | 64°F | 30% | 20% | 15 h |
| July 16 | 85°F | 64°F | 30% | 20% | 15 h |
| July 17 | 85°F | 64°F | 30% | 20% | 15 h |
| July 18 | 85°F | 64°F | 29% | 20% | 15 h |
| July 19 | 85°F | 64°F | 29% | 20% | 15 h |
| July 20 | 85°F | 64°F | 29% | 19% | 14 h 50 min |
| July 21 | 85°F | 64°F | 29% | 19% | 14 h 50 min |
| July 22 | 85°F | 64°F | 29% | 19% | 14 h 50 min |
| July 23 | 85°F | 64°F | 29% | 19% | 14 h 50 min |
| July 24 | 85°F | 64°F | 29% | 19% | 14 h 50 min |
| July 25 | 85°F | 64°F | 28% | 19% | 14 h 40 min |
| July 26 | 85°F | 64°F | 28% | 19% | 14 h 40 min |
| July 27 | 85°F | 64°F | 28% | 19% | 14 h 40 min |
| July 28 | 85°F | 64°F | 28% | 19% | 14 h 40 min |
| July 29 | 85°F | 63°F | 28% | 19% | 14 h 40 min |
| July 30 | 84°F | 63°F | 28% | 19% | 14 h 40 min |
| July 31 | 84°F | 63°F | 28% | 19% | 14 h 30 min |
- Normal high
- 85°FJuly average
- Normal low
- 64°FJuly average
- Precipitation
- 4.34 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 6
- Daylight
- 15 h 20 min to 14 h 30 minJuly 1 to July 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 24
- Sunshine
- 81%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 in Waterloo in July?
On a given July day the chance of 0.01 inch or more is 30% on average, highest around July 1 (34%). In all, 4.34 in falls on 9 days of a normal July, 1 of them with an inch or more.
In a normal July in Waterloo, 6 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094910.
How humid and windy is Waterloo in July?
At 3 p.m. the normal temperature is 81°F with 55% relative humidity and a dew point of 64°F; at 6 a.m. it is 64°F with 90% humidity. The wind averages 6.9 mph, most often from the west-southwest in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 64°F | 61°F | 90% | 4.6 mph | 64% |
| 9 a.m. | 74°F | 64°F | 71% | 8.1 mph | 72% |
| noon | 80°F | 64°F | 58% | 9.8 mph | 58% |
| 3 p.m. | 81°F | 64°F | 55% | 10.1 mph | 64% |
| 6 p.m. | 79°F | 64°F | 61% | 8.5 mph | 71% |
| 9 p.m. | 70°F | 64°F | 82% | 5.0 mph | 81% |
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 July in Waterloo?
The warmest July temperature on Waterloo's official record (since 1895) is 112°F, on July 14, 1936; the coldest is 42°F, on July 7, 1984. The wettest July brought 12.82 in (1999).
The July mean against the 1991-2020 normal of 74.5°F: 2021 75.3°F (+0.8), 2022 75.0°F (+0.5), 2023 73.3°F (−1.2), 2024 73.5°F (−1.0), 2025 74.7°F (+0.2), 2026 75.8°F (+1.3). 4 of 6 ran warmer than normal.
| July | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 75.3°F | +0.8°F | 1.23 in |
| 2022 | 75.0°F | +0.5°F | 3.50 in |
| 2023 | 73.3°F | −1.2°F | 3.95 in |
| 2024 | 73.5°F | −1.0°F | 5.39 in |
| 2025 | 74.7°F | +0.2°F | 9.99 in |
| 2026 | 75.8°F | +1.3°F | 7.11 in |
Source: records: ACIS, NWS threaded record ALOthr; recent months: ACIS, station USW00094910. Records and recent months use complete months only.
How does July in Waterloo compare across Iowa?
Across the 132 places PlainClimate covers in Iowa, July normal highs run from 79°F in Northwood to 87°F in Glenwood; Waterloo's is 85°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.