San José Weather in September

San José in September sees moderate temperatures, with highs around 14°C (57°F) and overnight lows of 1°C (34°F). Rainfall is fairly high at around 87 mm (3.4 in) on average, so pack waterproofs just in case.

Rainfall in San José in September

Typically around 4 days of rainfall are expected, averaging 87 mm (3.4 in) for the month. Rainfall tends to arrive in short, intense showers this month. Rain days are few, but the showers can be surprisingly heavy.

Temperature in San José in September

San José in September gets highs of 14°C (57°F) during the day and drops to 1°C (34°F) at night. Even when the weather is stable, mornings and evenings can still feel distinctly cool. With overnight lows of 1°C (34°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.

Sunshine in San José in September

The city usually sees around 221 hours of sunlight, indicating many sunny days despite the cool temperatures, making it a good month for sightseeing.

Should you favor a climate that's both dry and comfortably warm, January, February, March, November and December typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.