Waterloo Weather in September

Waterloo in September averages 18°C (64°F) during the day and 12°C (54°F) at night. This is part of the summer season, and quite a bit of rainfall is expected this month.

Rainfall in Waterloo in September

Based on our climate data of the past 30 years, about 16 days of rain are anticipated, with 104 mm (4.1 in) on average. This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.

Temperature in Waterloo in September

September in Waterloo sees highs of 18°C (64°F) and lows of 12°C (54°F) overnight. This month falls in the summer season. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. With overnight lows of 12°C (54°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Waterloo in September

With about 132 hours of sunshine, the area enjoys a nice balance of sun and overcast, creating a pleasant environment.

For Waterloo itself, July generally stands out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.