San Jose has a tropical monsoon climate, classified as Am in the Köppen system. The warmest month is March with an average high of 26°C, while the coldest month is January with lows dropping to 17°C. The annual temperature range of 9°C indicates a relatively stable climate year-round.
The driest month is February with only 11 rain days and 66mm of precipitation. For travellers, February through to the following month typically offers the best balance of warm temperatures and dry conditions. Average humidity ranges from 82% to 82% throughout the year.
Best Time to Visit San Jose
Based on temperature and rainfall data, the best months to visit San Jose are January, February, March. These months offer the most comfortable temperatures with relatively low rainfall, ideal for sightseeing and outdoor activities.
In March, San Jose experiences average highs of 26°C (79°F) and lows of 17°C (63°F). Expect around 13 rainy days and 11 hours of sunshine per day, with humidity averaging 82%. The 9°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an overshirt or cardigan handles the cooler evenings. UV index averages 6, so sun protection is advisable on clear days.
San Jose typically sees 13 rainy days in March, with total precipitation of around 61mm. Rain is moderate and manageable. Showers tend to pass quickly, and a light rain layer or foldable umbrella is sufficient protection for most days. For context, the driest month in San Jose typically sees 4-6 fewer rain days than March.
Pack light layers, a light jacket for evenings, comfortable walking shoes, and sunscreen for San Jose in March. Daytime temperatures of 26°C are pleasant, but the evening drop to 17°C means a jacket is essential if you plan to be out after dark. With 13 rainy days, bring a compact umbrella or waterproof jacket for unexpected showers. Comfortable walking shoes are a priority given the amount of ground most visitors cover.
March is a reasonable time to visit San Jose. Expect 13 rainy days, so pack a light rain layer for flexibility. Average temperatures of 26°C make outdoor exploration comfortable during the dry periods. With 11 daily sunshine hours, there are reliable windows of good weather to plan outdoor activities around, even if the month is not the driest on the calendar.
The average high temperature in San Jose in March is 26°C (79°F), and the average low is 17°C (63°F). The mean daily temperature is approximately 22°C (71°F). The day-to-night range of 9°C is moderate, meaning a single light jacket covers most situations. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.
The best month to visit San Jose is generally February. February offers the most sunshine at 11 hours per day and only 11 rainy days. Average temperatures reach 25°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around February gives you the best chance of dry, bright weather.
March is shoulder or low season in San Jose, meaning fewer tourists and generally lower prices than peak months. With 11 sunshine hours and 13 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.
In March, San Jose suits a range of activities thanks to mild temperatures around 26°C. Mix of indoor and outdoor activities works well given the moderate chance of rain. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 11 hours of sunshine, parks and waterfront walks are particularly enjoyable.