Climate in Lima

Summers are warm, humid, and sunny. Daily temperatures oscillate between lows of 18 °C (64 °F) to 22 °C (72 °F), and highs of 24 °C (75 °F) to 29 °C (84 °F). Skies are generally cloud free, especially during daytime. Occasional coastal fogs during some mornings and high clouds during some afternoons and evenings can be present. Lima summer sunsets are well known for being colorful. As such, they have been labeled by the locals as "cielo de brujas" (Spanish for "sky of witches"), since the sky commonly turns into shades of orange, pink and red around 7 pm. Winter weather is dramatically different. Gray skies, breezy conditions, high humidity and cool temperatures prevail. Long (1-week or more) stretches of dark overcast skies are not uncommon. Persistent morning drizzle occurs occasionally from June through September, coating the streets with a thin layer of water that generally dries up by early afternoon. Winter temperatures in Lima do not vary much between day and night. They range from lows of 12 °C (54 °F) to 16 °C (61 °F) and highs of 16 °C (61 °F) to 19 °C (66 °F), rarely exceeding 20 °C (68 °F) except in the easternmost districts.

Relative humidity is always very high, particularly in the mornings.  High humidity produces brief morning fog during the early summer and a usually persistent low cloud deck during the winter (generally developing in May and persisting all the way into late November or even early December). Predominant onshore flow makes the Lima area one of the cloudiest among the entire Peruvian coast. Lima has only 1284 hours of sunshine a year, 28.6 hours in July and 179.1 hours in January, exceptionally low values for the latitude