Monthly climate averages for Waterloo, United States. Based on 10-year ERA5 reanalysis data.
Dfa Hot-Summer Continental
Climate OverviewWaterloo, United States in August has warm conditions, with highs averaging 27.3°C (81°F).
This month falls at the end of Summer.
Temperatures remain fairly steady throughout August, with daily highs around 27°C (81°F).
August sees fairly even rainfall, totalling about 92 mm across the month.
Expect around 12.3h of sunshine at the start of August, decreasing to 10.8h by the end.
The warmest days tend to fall around the 4th, averaging 27.8°C (82°F).
Temperatures begin dropping heading into September.
Daily averages based on historical data (2016–2025)
Daytime temperatures around 27°C (81°F) are ideal for full-day outdoor exploration.
Rain usually comes in shorter passing showers rather than all-day rain.
2 of the last 5 yearly records were warmer than this month's long-run average.
| Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | -2°C / -10°C | -7°C / -16°C | 7days (41 mm) Good | 5.6h Fair | 76% Humid | 2.4 Moderate | Poor | View Details |
| February | 1°C / -9°C | -4°C / -15°C | 6days (37 mm) Good | 7.4h Good | 71% Muggy | 3.6 Moderate | Poor | View Details |
| March | 9°C / -1°C | 5°C / -6°C | 10days (81 mm) Wet | 7.9h Good | 66% Muggy | 4.4 Moderate | Poor | View Details |
| April | 15°C / 4°C | 12°C / 0°C | 12days (102 mm) Wet | 8.8h Good | 64% Muggy | 5.3 High | Fair | View Details |
| May best | 22°C / 11°C | 21°C / 9°C | 12days (140 mm) Wet | 9.9h Good | 67% Muggy | 6.8 High | Good | View Details |
| June best | 28°C / 18°C | 29°C / 17°C | 11days (118 mm) Wet | 12h Excellent | 68% Muggy | 7 High | Excellent | View Details |
| July best | 28°C / 19°C | 31°C / 20°C | 10days (115 mm) Wet | 12.1h Excellent | 75% Muggy | 7.1 Very High | Excellent | View Details |
| August best | 27°C / 18°C | 29°C / 19°C | 9days (92 mm) Wet | 11.3h Excellent | 73% Muggy | 6.6 High | Excellent | View Details |
| September best | 25°C / 15°C | 25°C / 14°C | 9days (99 mm) Wet | 9.7h Good | 69% Muggy | 5.5 High | Excellent | View Details |
| October | 17°C / 8°C | 14°C / 5°C | 9days (96 mm) Wet | 7.5h Good | 65% Muggy | 3.9 Moderate | Fair | View Details |
| November | 9°C / 0°C | 5°C / -4°C | 6days (51 mm) Good | 6.4h Fair | 69% Muggy | 2.6 Moderate | Poor | View Details |
| December | 2°C / -6°C | -3°C / -11°C | 6days (39 mm) Good | 5.4h Fair | 72% Muggy | 2 Low | Poor | View Details |
Summer clothing like shorts, t-shirts, and sundresses will be comfortable. Bring a light cardigan for air-conditioned spaces.
A waterproof jacket or compact umbrella is recommended for occasional showers.
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