Tijuana sits at the northwestern corner of Mexico, on the Pacific coast directly across the border from San Diego, on hilly terrain at approximately 32.51°N, 117.04°W. Cooled by the cold California Current offshore, it has a mild Mediterranean climate bordering semi-arid (Köppen Csb/BSk) — warm, dry summers and mild, wetter winters — with remarkably even temperatures.

Summer, from June to September, is warm and dry rather than hot, with August the warmest month — highs around 26–27°C — kept comfortable by the cold California Current and the reliable sea breeze. Rain is essentially absent for months, and morning coastal fog and low cloud — the 'May gray' and 'June gloom' — often veil the coast before burning off.

Winter, from December to February, is mild and the wetter season, with January the coolest month — highs around 19°C and cool nights near 8–9°C, with frost effectively unknown on the coast. Most of the year's rain falls in these months, brought by Pacific storm systems, though sunshine remains plentiful between the fronts.

Tijuana is dry, receiving only around 230–260 mm of rain a year, almost all of it between December and March, while the long summer is essentially rainless; the cold offshore current suppresses rainfall and feeds the coastal fog. Live rainfall, humidity, and pressure readings for the city are shown in the panels above.

Tijuana's climate is governed by the cold California Current, which keeps its summers unusually mild for the latitude and generates the persistent morning fog of late spring. Its other distinctive wind is the Santa Ana, a hot, dry gust off the interior deserts that can reverse the pattern entirely, bringing sudden heat and raising wildfire risk in autumn.

To follow any single measurement in Tijuana more closely, use our live instruments: the online barometer for atmospheric pressure, the thermometer for temperature, the hygrometer for humidity, the anemometer for wind speed, the wind vane for wind direction, and the rain gauge for rainfall.