Weather in Costa Rica in September
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Book now, pay at pickup — compare Hertz, Avis, Budget, Sixt and 800+ rental companies for September in Costa Rica.
Compare car hire prices → Affiliate link — we earn a commission at no extra cost to youCosta Rica in September is warm — daytime temperatures average 24.9°C, dropping to 16.1°C at night. The month is extremely wet, with heavy downpours most days, with roughly 8.5 hours of sunshine a day. Weather-wise, this is one of the most reliable months to travel. For the complete picture, see the best time to visit Costa Rica — every month compared. Once you know when to go, find your Costa Rica packing list at 247PackingList.
Get ready for Costa Rica in September
Search flights to Costa Rica
Compare 100+ airlines for September — one search, best price.
Search Flights →Travel clothing layers
Pack layers — temperatures can vary significantly between day and night.
Check Price →What to pack for Costa Rica in September
- Light layers
- Sunscreen
- T-shirts and light trousers or shorts
- Compact travel umbrella
- Waterproof jacket
- Quick-dry clothing
Compare all months in Costa Rica
| Month | High | Rain | Rating |
|---|---|---|---|
| January | 24.7°C | 33.8mm | 10/10 |
| February | 25.9°C | 8.4mm | 10/10 |
| March | 26.5°C | 50.7mm | 10/10 |
| April | 26.5°C | 148.8mm | 9/10 |
| May | 25.7°C | 343.3mm | 8/10 |
| June | 24.2°C | 408.2mm | 8/10 |
| July | 24.8°C | 341.3mm | 8/10 |
| August | 24.7°C | 561.2mm | 8/10 |
| September | 24.9°C | 484.9mm | 8/10 |
| October | 24.2°C | 579.6mm | 8/10 |
| November | 23.7°C | 350.7mm | 8/10 |
| December | 24.3°C | 65.0mm | 10/10 |
Full month-by-month guide: best time to visit Costa Rica →
For facts about Costa Rica — currency, language and dialling code — see our Costa Rica country guide at 247CountryInfo. Travellers also find it useful to keep a Costa Rica travel guide to hand. Check clothing sizes in Costa Rica before you shop.
Frequently Asked Questions
Is September a good time to visit Costa Rica?
September rates 8/10 for visiting Costa Rica — good time to visit. Expect average highs of 24.9°C, 484.9mm of rain across the month and about 8.5 hours of daily sunshine.
What is the temperature in Costa Rica in September?
In September, Costa Rica has average highs of 24.9°C (76.8°F) and average lows of 16.1°C (61.0°F).
Does it rain in Costa Rica in September?
Yes — September is one of the wetter months in Costa Rica, averaging 484.9mm of rain over roughly 29 rainy days. Pack for heavy showers.
What should I wear in Costa Rica in September?
For Costa Rica in September (24.9°C highs / 16.1°C lows), pack light layers plus sunscreen, t-shirts and light trousers or shorts, compact travel umbrella.
More essentials for Costa Rica in September
Packing cubes
Keep the bag organised whatever the weather — compression cubes for every size.
Check Price →Travel first aid kit
Compact TSA-friendly kit for peace of mind wherever you travel.
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Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.