July is one of the warmer months of the year in Waterloo, with average highs near 27.3°C and lows around 15°C (mean 21.2°C). It is a relatively wet time of year, averaging 74 mm of rainfall and 68% relative humidity across the period.
July is one of the warmer months of the year in Waterloo. Across 45 years of records, the warmest July in Waterloo was 2020 — when the month averaged 24.3°C — while the coldest was 2000 at 17.6°C. Typical July days reach 27.3°C with nights near 15°C. The long-term trend is warming, about 0.2°C per decade.
July is a relatively wet time of year in Waterloo, averaging 74 mm of rainfall. The wettest July on record was 1992 with 147 mm, while the driest was 1989 at 23 mm.
Relative humidity in Waterloo during July averages 68%. The most humid July was 2000 at 81%, and the least humid was 1988 at 56%.
July receives about 6.1 kWh/m²/day of solar energy in Waterloo. The sunniest July was 2002 at 6.7 kWh/m²/day, and the cloudiest was 2004 at 5.3.
Average wind speed in Waterloo during July is 2.6 m/s. The windiest July was 1999 at 3.1 m/s, while the calmest was 2024 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 21.5°C | 20.6°C | 20.4°C | 21.5°C | 22.3°C | +0.8°C |
| Avg High | 27.9°C | 26.8°C | 26.3°C | 27.5°C | 28.6°C | +0.7°C |
| Avg Low | 15.1°C | 14.5°C | 14.5°C | 15.4°C | 16.1°C | +1°C |
| Avg Rain | 56 mm | 76 mm | 83 mm | 77 mm | 76 mm | +20 mm |
July temperatures in Waterloo have risen by about 1.4°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 6.4°C (2001) to a record high of 38°C (1988).
Rainfall in July is a relatively wet time of year, averaging 74 mm, with a wettest year of 147 mm.
One of the best times to visit Waterloo
July is one of the best times to visit Waterloo. Expect days averaging 27.3°C and nights around 15°C (mean 21.2°C) — warmer than Waterloo's yearly average — with moderate rainfall (74 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 30.4°C | 23.4°C | 16.5°C | 35.7°C | 10.7°C | 56 mm | 63% | 2.4 m/s | 6.5 |
| 2024 | 28.1°C | 22.0°C | 16.0°C | 32.6°C | 8.7°C | 99 mm | 67% | 2.1 m/s | 6 |
| 2023 | 27.4°C | 21.5°C | 15.6°C | 32.8°C | 12.1°C | 114 mm | 68% | 2.3 m/s | 5.7 |
| 2022 | 28.3°C | 21.8°C | 15.2°C | 33.3°C | 10.5°C | 50 mm | 62% | 2.8 m/s | 6.2 |
| 2021 | 26.6°C | 20.9°C | 15.2°C | 32.0°C | 9.0°C | 82 mm | 70% | 2.8 m/s | 5.5 |
| 2020 🔥 | 30.6°C | 24.3°C | 17.9°C | 35.1°C | 13.6°C | 53 mm | 65% | 2.5 m/s | 6.5 |
| 2019 | 28.4°C | 22.3°C | 16.3°C | 31.3°C | 11.6°C | 65 mm | 71% | 2.4 m/s | 6.4 |
| 2018 | 28.7°C | 22.4°C | 16.1°C | 33.7°C | 9.9°C | 71 mm | 66% | 2.5 m/s | 6.5 |
| 2017 | 24.7°C | 19.6°C | 14.5°C | 27.9°C | 10.7°C | 93 mm | 79% | 2.3 m/s | 5.8 |
| 2016 | 29.0°C | 22.6°C | 16.2°C | 34.3°C | 9.7°C | 58 mm | 64% | 2.9 m/s | 6.4 |
| 2015 | 26.4°C | 20.1°C | 13.7°C | 33.1°C | 8.4°C | 41 mm | 69% | 2.3 m/s | 6.5 |
| 2014 | 24.0°C | 18.3°C | 12.7°C | 30.4°C | 8.1°C | 131 mm | 74% | 2.7 m/s | 5.9 |
| 2013 | 25.3°C | 20.4°C | 15.5°C | 31.4°C | 8.9°C | 114 mm | 79% | 2.2 m/s | 5.7 |
| 2012 | 30.2°C | 23.5°C | 16.7°C | 35.7°C | 12.8°C | 59 mm | 61% | 2.5 m/s | 6.4 |
| 2011 | 29.8°C | 23.1°C | 16.5°C | 35.7°C | 11.4°C | 30 mm | 66% | 2.5 m/s | 6.6 |
| 2010 | 28.5°C | 22.3°C | 16.1°C | 34.6°C | 8.1°C | 111 mm | 68% | 2.5 m/s | 6.2 |
| 2009 | 23.5°C | 17.9°C | 12.3°C | 26.6°C | 7.9°C | 79 mm | 73% | 2.6 m/s | 5.4 |
| 2008 | 26.8°C | 21.0°C | 15.2°C | 31.4°C | 9.2°C | 122 mm | 71% | 2.6 m/s | 6.3 |
| 2007 | 27.0°C | 20.8°C | 14.6°C | 33.1°C | 7.8°C | 51 mm | 62% | 2.5 m/s | 5.9 |
| 2006 | 29.3°C | 23.0°C | 16.8°C | 35.1°C | 10.4°C | 102 mm | 67% | 2.9 m/s | 5.9 |
| 2005 | 29.2°C | 22.6°C | 16.0°C | 36.1°C | 9.8°C | 108 mm | 64% | 2.4 m/s | 6.2 |
| 2004 | 24.4°C | 19.0°C | 13.7°C | 30.9°C | 9.5°C | 90 mm | 78% | 2.5 m/s | 5.3 |
| 2003 | 26.1°C | 20.1°C | 14.1°C | 31.7°C | 9.6°C | 74 mm | 70% | 2.8 m/s | 5.7 |
| 2002 | 28.6°C | 22.2°C | 15.8°C | 32.0°C | 10.4°C | 53 mm | 67% | 2.5 m/s | 6.7 |
| 2001 | 25.5°C | 19.4°C | 13.3°C | 32.4°C | 6.4°C | 31 mm | 68% | 2.8 m/s | 6.3 |
| 2000 ❄️ | 22.5°C | 17.6°C | 12.8°C | 25.9°C | 8.6°C | 118 mm | 81% | 2.2 m/s | 5.7 |
| 1999 | 29.5°C | 22.9°C | 16.4°C | 33.7°C | 9.9°C | 54 mm | 64% | 3.1 m/s | 6.2 |
| 1998 | 27.2°C | 20.8°C | 14.5°C | 32.3°C | 11.0°C | 68 mm | 65% | 2.7 m/s | 6.3 |
| 1997 | 26.6°C | 20.2°C | 13.9°C | 32.4°C | 9.1°C | 58 mm | 68% | 2.8 m/s | 6.1 |
| 1996 | 25.6°C | 19.3°C | 13.0°C | 28.9°C | 8.8°C | 61 mm | 66% | 2.9 m/s | 6.2 |
| 1995 | 27.9°C | 21.8°C | 15.6°C | 34.7°C | 8.9°C | 43 mm | 67% | 2.9 m/s | 5.9 |
| 1994 | 26.3°C | 20.6°C | 15.0°C | 30.2°C | 8.6°C | 81 mm | 72% | 2.6 m/s | 5.9 |
| 1993 | 27.4°C | 21.5°C | 15.5°C | 31.1°C | 10.4°C | 67 mm | 69% | 2.9 m/s | 6 |
| 1992 🌧️ | 23.8°C | 18.0°C | 12.1°C | 30.6°C | 6.9°C | 147 mm | 73% | 2.8 m/s | 5.6 |
| 1991 | 27.2°C | 21.0°C | 14.7°C | 33.2°C | 9.3°C | 103 mm | 66% | 2.7 m/s | 6.5 |
| 1990 | 26.4°C | 20.3°C | 14.3°C | 32.6°C | 9.3°C | 83 mm | 66% | 2.9 m/s | 5.8 |
| 1989 | 29.2°C | 22.6°C | 16.1°C | 34.7°C | 9.2°C | 23 mm | 58% | 2.3 m/s | 6.6 |
| 1988 | 30.6°C | 23.6°C | 16.6°C | 38.0°C | 9.4°C | 93 mm | 56% | 2.4 m/s | 6.1 |
| 1987 | 29.9°C | 23.2°C | 16.5°C | 34.4°C | 10.1°C | 30 mm | 62% | 2.8 m/s | 6.4 |
| 1986 | 27.8°C | 21.4°C | 15.0°C | 33.1°C | 7.9°C | 85 mm | 68% | 2.8 m/s | 6.2 |
| 1985 | 25.9°C | 19.8°C | 13.6°C | 31.3°C | 8.2°C | 38 mm | 65% | 2.9 m/s | 6.3 |
| 1984 | 25.5°C | 19.4°C | 13.3°C | 30.5°C | 6.6°C | 59 mm | 69% | 2.7 m/s | 5.4 |
| 1983 | 27.8°C | 21.7°C | 15.6°C | 32.1°C | 7.1°C | 57 mm | 70% | 2.8 m/s | — |
| 1982 | 25.8°C | 19.9°C | 14.0°C | 29.9°C | 8.1°C | 53 mm | 72% | 2.5 m/s | — |
| 1981 | 28.3°C | 21.5°C | 14.8°C | 32.8°C | 9.5°C | 64 mm | 63% | 2.7 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 27.3°C with lows near 15°C (mean 21.2°C), based on 45 years of NASA POWER data.
July averages 74 mm of rainfall in Waterloo, a relatively wet time of year. The wettest on record was 147 mm in 1992.
The hottest July reached 38°C in 1988. The coldest dipped to 6.4°C in 2001.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 1.4°C. Daytime highs moved from 26.7°C to 28.2°C and overnight lows from 14.3°C to 15.7°C over the same span.
July is one of the warmer months of the year in Waterloo and a relatively wet time of year, so plan for around 27.3°C daytime highs and 15°C at night.
Not quite — July is the 12th coolest month in Waterloo, averaging 21.2°C.
For July in Waterloo, pack light layers you can adjust through the day, with typical highs of 27.3°C and lows of 15°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 68% — moderately humid.
Average wind speed in July is 2.6 m/s. The windiest July on record averaged 3.1 m/s (1999).
The wettest July on record was 1992 with 147 mm. On average, July sees 74 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Waterloo behaves each July, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for July specifically, along with year-by-year records and how the month has changed over the decades.
