San Mateo Weather in October
Thinking of visiting San Mateo in October? Expect high temperatures reaching 28°C (82°F) during the day, dropping to 21°C (70°F) at night, and be prepared for the wettest month of the year.
Rainfall in San Mateo in October
San Mateo is in the rainy season in October, with rain on around 22 days and an average of 548 mm (22 in). Rain during the rainy season here tends to be intense rather than just persistent drizzle. Expect significant downpours.
Temperature in San Mateo in October
Daytime highs in San Mateo in October reach 28°C (82°F), with nights around 21°C (70°F). This kind of day-to-night contrast is typical for this time of year. Nights remain mild at 21°C (70°F), making evenings a pleasant time to be outdoors. While slightly cooler, this month still offers warm and pleasant weather.
Sunshine in San Mateo in October
You can expect a moderate amount of sunlight, with approximately 167 hours. Even though this month is part of the wet season, you can still see the sun occasionally.October in San Mateo 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 San Mateo's climate page.
San Mateo Temperature in October
Min Temperature
21°C (70°F)
Max Temperature
28°C (82°F)
Chance of Rain
72%
Precipitation
548 mm (22 in)
Rainy days
22 days
Sunshine
167 hours *
Percentage Sunshine
*
Daily Historical Temperatures
46-year average (1976-2025)
Based on our historical records, temperatures in San Mateo typically stay consistent throughout October, with daily highs averaging around 28°C (82°F). Nights are pleasant, with lows around 19°C (66°F).
Average temperatures in October
Daily Historical Precipitation
46-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in October
Historical weather for San Mateo in October
Browse day-by-day weather records for San Mateo spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Mateo historical weather extremes in October
Based on 31 years of weather observations (1994-2025), these are the most extreme conditions recorded in San Mateo.
- San Mateo recorded its highest October temperature of 33°C (91°F) on October 20, 2017.
- The coldest October day was on October 16, 2011, with a maximum of 20°C (68°F).
- Nighttime temperatures dropped to 16°C (61°F) on October 7, 2018, marking the coldest October night on record.
- The wettest October day on record brought 157 mm (6.2 in) of precipitation to San Mateo (October 5, 2017).
Best Places in Costa Rica in October
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 October →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in San Mateo in October
Warm but pleasant conditions in San Mateo in October. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in San Mateo in October
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 San Mateo's climate page.
See the full San Mateo climate overview or explore weather in Costa Rica.
