Thornhill Weather in September

Thornhill in September sees moderate daytime temperatures of 16°C (61°F) and nighttime lows of 9°C (48°F). Rainfall is fairly high this month at around 102 mm (4 in), so pack a rain jacket to stay dry.

Rainfall in Thornhill in September

Historically, the month has about 20 days of rain, averaging 102 mm (4 in) in total. This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.

Temperature in Thornhill in September

In September, Thornhill gets moderate temperatures, with highs of 16°C (61°F). Nights cool to around 9°C (48°F). A light jacket or extra layer can be useful, especially outside the warmest hours of the day. At 9°C (48°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.

Sunshine in Thornhill in September

The area enjoys a moderate level of sunlight, with around 117 hours. It's a good balance between sunny and cloudy days.

If you prefer enjoying temperate temperatures and rain-free days, May, July and August typically offer 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.