Saint John Weather in September

During September, Saint John experiences pleasant daytime temperatures of 18°C (64°F) and cooler nights around 12°C (54°F). As part of the summer season, expect quite a bit of rainfall. Around 115 mm (4.5 in) is typical.

Rainfall in Saint John in September

You can expect rain on roughly 11 days based on historical data, averaging 115 mm (4.5 in) for the month. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.

Temperature in Saint John in September

In September, Saint John sees pleasant temperatures, with highs of 18°C (64°F). Nights drop to around 12°C (54°F). The summer season takes place during September. Conditions are often most pleasant around the middle of the day. With lows of 12°C (54°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

If you prefer enjoying temperate temperatures and rain-free days, 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.