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Compare Costa Rica weather in February, from dry and sunny Tamarindo to wetter Puerto Viejo, plus Jacó, Arenal and San José.
Alajuela Weather in May
May in Alajuela averages 26°C (79°F) during the day and 18°C (64°F) at night. May is part of the rainy season, with around 340 mm (13 in) of rainfall and frequent showers.
Rainfall in Alajuela in May
Alajuela is in the rainy season in May, with rain on around 19 days and an average of 340 mm (13 in). Rain during the rainy season here tends to be intense rather than just persistent drizzle. Expect significant downpours.
Temperature in Alajuela in May
Alajuela in May gets highs of 26°C (79°F) during the day and drops to 18°C (64°F) at night. Overall, the month follows a fairly predictable daily temperature pattern. With overnight lows of 18°C (64°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Alajuela in May
The city usually sees around 183 hours of sunlight, indicating a moderately sunny period (despite it being part of rainy season).If you're looking for dry conditions and comfortable temperatures, May may not be the ideal month to visit Alajuela. Our weather planner can help you explore destinations with more pleasant weather conditions.
Alajuela Temperature in May
Min Temperature
18°C (64°F)
Max Temperature
26°C (79°F)
Chance of Rain
64%
Precipitation
340 mm (13 in)
Rainy days
19 days
Humidity
77% *
Sunshine
183 hours *
Percentage Sunshine
*
* Data from: San José, Costa Rica (17 KM, 11 Miles).
Alajuela Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Alajuela - and find the best time to visit.
Daily Historical Temperatures
43-year average (1977-2025)
Based on our historical records, temperatures in Alajuela typically stay consistent throughout May, with daily highs averaging around 26°C (79°F). Nights are pleasant, with lows around 20°C (68°F).
Average temperatures in May
Daily Historical Precipitation
43-year average (1977-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather records for Alajuela in May
Browse day-by-day weather records for Alajuela spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Alajuela historical weather extremes in May
According to our 29 years of weather records for Alajuela, the following extremes were recorded between 1997 and 2026.
- Alajuela recorded its highest May temperature of 33°C (91°F) on May 13, 1998.
- The coldest May day was on May 29, 2008, with a maximum of 19°C (66°F).
- The coldest night in May in Alajuela was on May 7, 2013, with a minimum of 16°C (61°F).
- The wettest May day on record brought 156 mm (6.1 in) of precipitation to Alajuela (May 15, 2001).
Best Places in Costa Rica in May
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 May →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Alajuela in May
Warm temperatures in May 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! Bring sunglasses since you'll have some sunny periods throughout the month
What To Do in Alajuela in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming7/10 -
Cycling7/10 -
Walking7/10 -
Camping6/10 -
Outdoor sports7/10
Alajuela 3-Day Forecast
More climate data for Alajuela
Temperature Rainfall Sunshine Humidity
See the full Alajuela climate overview or explore weather in Costa Rica.
Popular in May
Where to go in May - average daytime high across popular destinations.
Tamarindo
32°C (90°F) Santa Teresa29°C (84°F) Cahuita29°C (84°F) Fortuna29°C (84°F) Herradura29°C (84°F) Puerto Viejo de Talamanca29°C (84°F) Jacó29°C (84°F) San José25°C (77°F) Bucket list
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