San José in August
In August, San José averages 26°C (79°F) during the day and 17°C (63°F) at night, with frequent rain — about 23 days of the month see precipitation (241 mm total).
High seasonConditions are warm and beach-friendly. Expect daily rain or showers, often in heavy bursts.
August offers comfortable temperatures in San José, with some rain to plan around.
How August compares to the rest of the year in San José
August is in the middle of the year for warmth in San José (5th of 12) and one of the wettest months (3rd of 12). Daytime temperature runs 1°C above the annual average (25°C). August runs 1°C warmer than July (25°C) and stays flat into September.
August sunrise & sunset in San José
Times shown for San José local time (America/Costa_Rica), calculated for the 15th of August. They shift by a few minutes day to day across the month.
Photography light in San José — August
Golden-hour and blue-hour windows for the 15th of August, in San José's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — San José in August
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on August's tier (High season) and San José's popularity.
Crowds & pricing — August in San José
This is a busy month in San José — not the absolute peak, but tourist numbers are clearly elevated. You'll feel it at headline attractions on weekends and in the historic centre, though side streets and lesser-known sights stay manageable. Prices are above off-season but not at their summit. A good week for first-time visitors who want everything open without the worst of the crush.
Why this tier: comfortable tourism weather Northern Hemisphere summer holidays
Sun & mosquito risk — August in San José
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
San José in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 24°C / 75°F | 15°C / 59°F | 6 mm | 1 | — |
| February | 25°C / 77°F | 15°C / 59°F | 8 mm | 1 | — |
| March | 26°C / 79°F | 16°C / 61°F | 18 mm | 2 | — |
| April | 27°C / 81°F | 17°C / 63°F | 65 mm | 7 | — |
| May | 26°C / 79°F | 17°C / 63°F | 226 mm | 19 | — |
| June | 26°C / 79°F | 17°C / 63°F | 248 mm | 22 | — |
| July | 25°C / 77°F | 17°C / 63°F | 211 mm | 21 | — |
| August | 26°C / 79°F | 17°C / 63°F | 241 mm | 23 | — |
| September | 26°C / 79°F | 17°C / 63°F | 305 mm | 24 | — |
| October | 25°C / 77°F | 17°C / 63°F | 300 mm | 25 | — |
| November | 25°C / 77°F | 16°C / 61°F | 145 mm | 14 | — |
| December | 24°C / 75°F | 15°C / 59°F | 41 mm | 4 | — |
Other cities with similar August weather
🌍 See the full ranked list of climate twins for San José in August →
Frequently asked questions
How hot is San José in August?
In August, San José averages a high of 26°C (79°F) and a low of 17°C (63°F) — generally warm.
Does it rain a lot in San José in August?
August is quite rainy in San José, with about 23 rainy days on average.
Is August a good time to visit San José?
August is warm but on the rainy side. It suits travelers who are comfortable with warm weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for San José in August?
Pack light layers for warm days and cooler evenings, plus a compact umbrella or rain jacket. See the full August packing list for San José for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.