San José weather
Our guide to the weather in San José during September
We've looked at the most up-to-date weather data for San José, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about San José weather in September.
How warm is it in San José during September?
The temperature reaches around 24℃ during the daytime in September, falling away to 16℃ at night. The UV index will be moderate at this time of year, so not something to worry about for the average person. However, if you're going to be outside for long periods it's worth wearing a broad spectrum SPF 30+ sunscreen and UV-blocking sunglasses. Remember that bright surfaces, such as water and sand increase UV exposure.
Does it rain in San José during September?
On average, there will be 28 rainy days during the month, amounting to 852.4mm in total. That's a lot of rain. For comparison, the wettest months in the UK typically sees between 80mm and 100mm, depending on where you are. There's a good chance that you'll catch a thunderstorm during your trip.
Is it windy in San José during September?
No - there is very light air movement in September so conditions should be calm with light breezes at times.
How warm is the sea in San José during September?
The water around San José is around 20℃ during September. It will feel a little on the cool when first entering, but you'll warm up quickly. Most kids will have no problem with this temperature, but those who feel the cold are unlikely to want to swim.
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Weather in San José
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