Princeton Weather in September

Thinking of visiting Princeton in September? Expect moderate temperatures reaching 17°C (63°F) during the day, dropping to 4°C (39°F) at night, with some rainfall likely.

Rainfall in Princeton in September

Historically, September sees about 8 days of rain, with a monthly average of 40 mm (1.6 in). The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.

Temperature in Princeton in September

In September, Princeton gets moderate temperatures, with highs of 17°C (63°F). Nights cool to around 4°C (39°F). September is part of summer. This creates a mild day-to-night pattern that is generally easy to manage with the right clothing. Nights drop to 4°C (39°F). Cold nights like these are actually great for sleeping well, as long as you have a warm enough duvet.

If you prefer dry days with pleasant temperatures, 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.