The month in detail
What to expect in September
In September, San José sees 25°C during the day with 4.9h of sunshine per day. With 72% of rainy days, always have indoor alternatives planned.
September ranks 10 out of 12 months in San José. Compared to August: 20 pts more rainy days.
This month's conditions
What it's like in September
UV index
8 · high
sunscreen and hat advised
Feels like
muggy at times
18°
Daylight
12.1h of daylight
Air quality
excellent
AQI 19
Compare
Is September the right month?
The best month in San José is March (9.2/10), 4.7 pts higher than September.
Book
Plan your trip
Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.
Stay
Hotels & rentals · San José
Expedia →
Activities
Tours, tickets, experiences
See ↓
Flights
Multi-airline comparator
Kiwi →
🎟️ Activities & tours · San José
GetYourGuide selection · free cancellation
Practical info
What you need to know before you go
Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a beach holiday.
Country · Costa Rica
🗣️LanguageSpanish
💶CurrencyColón costaricain (₡)
🚗DrivingRight-hand
🛡️Safety ⓘVery safe · 1/5
💰Cost of living ⓘModerate · 3/5
🌡️ Climate
🌍Climate typeEquatorial tropical
📈Climate trend ⓘStable
🔥Hottest monthMarch · 27°C
❄️Coolest monthJune · 24°C
🌧️Rainiest month ⓘSeptember · 72%
🏖️ Beach holiday
📅Peak seasonJuin → Sept
🏖️Swell (Sept–Mar) ⓘModérée
Explore
Other destinations in September
If September doesn't convince you for this destination, compare with others.
Similar climate
Costa RicaCosta Rica
GranadaNicaragua
PanamaPanama
San Cristóbal de las CasasMexico
MonroviaLiberia
Location
Where is San José ?
Global position + regional geographic context.
🌍 World
🔍 Geographic context
Costa RicaEquatorial tropical climate with a 9.2 → 4.5 gap between best and worst month. 10 years of ERA5 data to choose by project.
9.93°N · 84.08°W
Questions
Frequently asked questions
What is the best time to visit San José?
February is the best month with 26.0°C highs, 16.0°C lows, 9.4h of sunshine and 8.0% rainy days. The months of February & March offer comparable conditions.
How many hours of sunshine does San José get in February?
San José averages 9.4 sunshine hours per day in February. It is the sunniest month with a climate score of 8.7/10.
What is the rainiest month in San José?
June is the most unfavourable month with June has the lowest climate score of the year and the lowest climate score of the year.
What are the temperatures at night in San José in February?
In February, overnight lows reach 16.0°C, while afternoon highs average 26.0°C.
Is San José good in winter?
In winter (December-February), San José scores 8.4/10 on average — Decent period conditions for cultural visits.. The best month overall remains February with a score of 8.7/10.
When should you avoid San José?
June is the most difficult month to visit San José, with June has the lowest climate score of the year. Climate conditions are at their lowest of the year during this period.
Do you need sun protection in San José in September?
The average UV index reaches 8 in September in San José (high), with about 12.1h of daylight. Sunscreen and hat advised.