This month in Costa Rica
Costa Rica Weather in September
September's climate at Tamarindo, Guanacaste, Costa Rica (Pacific coast) pairs 12.46 inches of rain with 85.8°F days and 76.5°F nights (historical averages). American through Chicago and Miami had the lowest Omaha fare for September 11 to 18 at $651. Daylight on the 15th runs 5:33 am to 5:44 pm (12.2 hours), with Guanacaste 1 hour behind Omaha in September.
Photo: Ann Lane
High / low
86° / 77°F
Rain
12.5 in
for the month
Humidity
84%
Wind
5 mph
Hurricane season
In season
Fare from OMA
$651
Sep 11, 2027–Sep 18, 2027
Verdict
September in Costa Rica: 12.46 in rain, 85.8°F average high; peak hurricane window.
Rule: rain, comfort band and hurricane timing, explained on the method page.
vs last / next month
- vs August: 1°F cooler, 3.7 in wetter, 3 pts more humid
- vs October: 2°F warmer, 1 in drier, 3 pts less humid
- September sky: 81.1% cloud, 4.92 kWh/m²/day solar. August: 79.2% / 4.97; October: 80.3% / 4.47 (NASA).
- 2027-09-15: sunrise 05:33, sunset 17:44; 12.18 hours of light, changing -17 minutes across September. August daylight: 12.46 hours; October: 11.90. Omaha clock offset: -1 hours.
- September water: 84.2°F (NOAA 2015–2024). August water: 84.2°F; October: 83.4°F. Dew point: 74.8°F in September, 74.4°F in August, 74.8°F in October (NASA 2001–2025).
- Fares: September's $651 search result matches on August's $651; October has no fare yet because schedules were not open.
NASA POWER 2001–2025 means, Tamarindo, Guanacaste, Costa Rica (Pacific coast).
Holidays & events
- September holidays on the Costa Rica MTSS feriados list: Independence Day on September 15. On the Omaha side, Labor Day on September 6 is US federal holiday (OPM), which moves demand on flights out of Nebraska, not the destination. September crowd levels: no source, so left out.
Pack for September (rule shown)
- Packable rain jacketrain 12.5 in > 3 in
- Quick-dry shoes, not just sandalsrain 12.5 in > 6 in
- Breathable fabrics, extra topshumidity 84% ≥ 80%
- Travel insurance confirmation and the resort's weather policyinside hurricane season
- Sunscreen you will reapplySeptember solar energy 4.92 kWh/m2/day is under our 5.0 line, so the rash guard is optional (daily-mean UV 2.04).
Flight detail, OMA to LIR
$651
American, 2 stops via ORD/MIA, 18h 11m out. 28 itineraries. Observed Oct 31, 2026; not a quote.
Guide, sources and the 12-month table: Costa Rica.
September questions
What changes around September in Costa Rica?
Are there public holidays in Costa Rica in September?
Sources: ignav.com · nhc.noaa.gov · escuelajudicialpj.poder-judicial.go.cr · power.larc.nasa.gov · coastwatch.pfeg.noaa.gov · opm.gov · travel.state.gov · travel.state.gov · power.larc.nasa.gov
From Ann
September in Costa Rica, priced for your week.
Considering September in Costa Rica? Share your dates and budget. Ann checks OMA–LIR flights and places to stay against this 12.46 in rain / 85.8°F climate record.
Photo: Ann Lane