Liberia Weather in September
During September, Liberia experiences very high daytime temperatures of 31°C (88°F) and cooler nights around 22°C (72°F). September sits within the rainy season, so expect regular and often heavy rainfall.
Rainfall in Liberia in September
Liberia is in the rainy season in September, with rain on around 23 days and an average of 340 mm (13 in). The rainy season here brings regular, substantial showers. It's worth being prepared for rain on most days you're out.
Temperature in Liberia in September
Liberia in September gets highs of 31°C (88°F) during the day and drops to 22°C (72°F) at night. Mornings and evenings are often more comfortable than the peak afternoon hours. Nights are mild at around 22°C (72°F), which is comfortable for most people.
Sunshine in Liberia in September
The area enjoys a moderate level of sunlight, with around 158 hours. It's a good balance between sunny and rainy days.September in Liberia has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Costa Rica, check out our Liberia's climate page.
Liberia Temperature in September
Min Temperature
22°C (72°F)
Max Temperature
31°C (88°F)
Chance of Rain
78%
Precipitation
340 mm (13 in)
Rainy days
23 days
Humidity
86%
Sunshine
158 hours
Percentage Sunshine
Daily Historical Temperatures
41-year average (1977-2025)
Based on our historical records, temperatures in Liberia typically stay consistent throughout September, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 23°C (73°F).
Average temperatures in September
Daily Historical Precipitation
41-year average (1977-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Liberia in September
Browse day-by-day weather records for Liberia spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Liberia historical weather extremes in September
The extremes listed below come from historical weather data collected in Liberia from 1999 through 2025.
- On September 23, 2023, temperatures climbed to 35°C (95°F), marking the warmest September day on record.
- Liberia experienced its chilliest September day on September 4, 2008, reaching only 24°C (75°F).
- The coldest night in September in Liberia was on September 26, 2007, with a minimum of 20°C (68°F).
- The wettest September day on record brought 208 mm (8.2 in) of precipitation to Liberia (September 7, 2021).
Best Places in Costa Rica in September
Find out more about the weather in Costa Rica and which places have the best travel conditions in this month. See all of Costa Rica in September →
perfect weather
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tolerable
unpleasant
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What to Wear in Liberia in September
Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Liberia in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Costa Rica, check out our Liberia's climate page.
Temperature Rainfall Sunshine Humidity
See the full Liberia climate overview or explore weather in Costa Rica.
