AU
Level 2Exercise increased caution
Exercise increased caution
Costa Rica · Guanacaste · September
Guanacaste in Septemberhow the month reads
September is a mixed month — worth planning against specific weeks inside Costa Rica, with average temperatures for the region. The safety bulletins below apply.
- Rank
- 9 of 12
- Score
- 60/100
September match
60/100
Free-tier default preferences.
What’s open · September
Things to do in Guanacaste in September
- At its bestOlive ridley arribada, Ostional
the largest arrivals of the year, peaking in October in the depths of the rainy season
Sources: gypsycabnosara.com, costaricaexperts.com
Opening seasons are checked by hand against the operators and parks themselves, not derived from the climate figures on this page. Last reviewed 2026-08-28. Dates move — confirm before you book.
- Temperature30°C−0.4°C vs. yearly mean
- Month rank9 of 12for Guanacaste
- Best monthsJanuary · December · Februaryhighest regional score
12-month temperature · Guanacaste
September in context
View data table
| Month | Average daytime high (°C) |
|---|---|
| January | 29.7 |
| February | 30.6 |
| March | 31.7 |
| April | 32.3 |
| May | 31.1 |
| June | 29.6 |
| July | 29.7 |
| August | 29.8 |
| September | 29.7 |
| October | 29.0 |
| November | 28.7 |
| December | 29.0 |
Safety · 6 governments
What the governments say about Costa Rica
Combined advisory · most-cautious-wins
Exercise increased caution
Highest level across 6 governments · Advisory last changed
See breakdown by countryHide breakdown
CA
Level 2Exercise increased caution
Exercise increased caution
DE
Level 1Exercise normal precautions
Exercise normal precautions
NL
Level 2Exercise increased caution
Exercise increased caution
UK
Level 1Exercise normal precautions
Exercise normal precautions
US
Level 2Exercise increased caution
Exercise increased caution
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