What to expect in Costa Rica in September
September is usually the wrong time for Costa Rica: 28° / 21°. Consider January · March instead.
Costa Rica weather in September
Typical conditions in Costa Rica during September, based on long-run climate normals rather than any single year. Treat it as a planning guide, not a forecast.
| Average high | 28°C 82°F |
|---|---|
| Average low | 21°C 70°F |
| Rainfall | Wet 75/100 |
| How it feels | Warm and comfortable |
Average highs sit around 28°C with lows near 21°C. Expect a fair amount of rain, so plan indoor backups.
Crowds & demand
Crowd levels are Low for Costa Rica — plenty of space at the main sights.
Prices & value
Prices run low season this month: some of the best deals of the year.
What to pack
Light layers for 28°C days and something with sleeves for evenings, which cool to around 21°C. Add a compact rain shell and shoes you do not mind soaking; this is one of the wetter months.
What it costs
This is one of the cheaper months to visit Costa Rica. Flights and accommodation sit near their yearly floor, and you can usually book late without being punished for it. Compared with the most expensive month of the year, you are looking at roughly 56% less.
Who this month suits
- Anyone travelling on a budget
- People who would rather have space than perfect conditions
- Visitors who want to catch a festival
Events & what’s on
Look out for Sea Turtle Nesting Season, Independence Day while you’re there.
- Sea Turtle Nesting Season — Olive ridley turtles arrive in mass arribadas to nest at Ostional beach.
- Independence Day — Lantern parades and marching bands mark Central American independence on September 15.
Costa Rica in September compared with nearby months
If your dates are flexible by a few weeks, this is what shifting them actually buys you.
| Month | Temp | Crowds | Price | Score |
|---|---|---|---|---|
| July | 29° / 21° | Moderate | $ | 64 |
| August | 29° / 21° | Low | $ | 64 |
| September · This month | 28° / 21° | Low | $ | 67 |
| October | 28° / 21° | Low | $ | 66 |
| November | 29° / 21° | Moderate | $$ | 62 |
These months score higher for Costa Rica on the same blend of weather, crowds and price. Same destination, better odds.
Or go somewhere else in September
If the destination is negotiable but the month is not, these places are at their best in September.
Figures are climate normals and modelled estimates — a planning guide, not a forecast. We separate fact, estimate and recommendation. Updated August 2026
