San Mateo Weather in January
San Mateo in January sees high daytime temperatures of 30°C (86°F) and nighttime lows of 21°C (70°F). Moderate rainfall is typical, with around 58 mm (2.3 in) for the month.
Rainfall in San Mateo in January
Expect around 10 days of rain based on historical data, with 58 mm (2.3 in) average. Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.
Temperature in San Mateo in January
Daytime temperatures in San Mateo reach 30°C (86°F) in January, dropping to 21°C (70°F) at night. Conditions stay fairly consistent through the month, making it easier to plan what to wear. With overnight lows of 21°C (70°F), evenings stay pleasantly warm.
Sunshine in San Mateo in January
There are approximately 264 hours of sunshine this month, resulting in mostly clear days.If you prefer enjoying temperate temperatures and rain-free days, December typically offers the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
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 January
Min Temperature
21°C (70°F)
Max Temperature
30°C (86°F)
Chance of Rain
33%
Precipitation
58 mm (2.3 in)
Rainy days
10 days
Sunshine
264 hours *
Percentage Sunshine
*
Daily Historical Temperatures
46-year average (1976-2026)
Based on our historical records, temperatures in San Mateo typically stay consistent throughout January, with daily highs averaging around 30°C (86°F). Nights are pleasant, with lows around 19°C (66°F).
Average temperatures in January
Daily Historical Precipitation
46-year average (1976-2026)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in January
Historical weather for San Mateo in January
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 January
The extremes listed below come from historical weather data collected in San Mateo from 1997 through 2025.
- The hottest January day on record in San Mateo reached 31°C (88°F) (January 25, 2000).
- On January 15, 2000, San Mateo saw its coldest January day with temperatures maxing out at 20°C (68°F).
- The lowest overnight temperature recorded in January was 13°C (55°F) (January 11, 1997).
Best Places in Costa Rica in January
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 January →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in San Mateo in January
Warm temperatures in January 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. Rain gear is recommended, you can expect wet weather on multiple days. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in San Mateo in January
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.
