See weather forecast by city Piracicaba (SP) recorded the lowest temperature of 2026 early this Wednesday morning (15). At 4.8°C, the city had the coldest day of the year. The record was recorded by the meteorological station of the Integrated Center for Agrometeorological Information (of Ciiagro). With this index, the city surpassed the previous record, recorded in May 2026, when the lowest absolute temperatures were around 5ºC and 6ºC. ??How long will the cold last? During this Wednesday (15), temperatures should not exceed 25ºC. Minimum temperatures are expected to rise in the coming days, but will not reach 14ºC until the weekend. See how long the cold lasts. In addition to the Ciiagro station, Piracicaba also has a National Institute of Meteorology (Inmet) station, at this meteorological station today's minimum was 6.2°C. The minimum temperature of the year at the station was 5.3°C on May 12, 2026. According to data from the Department of Biosystems Engineering (LEB), at the Esalq-USP station, Piracicaba reached 6.4ºC at around 7am this Wednesday. Data from Esalq-USP shows that average temperatures in Piracicaba were between 14ºC and 18ºC in the last week. Follow g1 Piracicaba on Instagram Piracicaba broke the record for lowest temperature in 2026 Claudia Assencio/g1 Alert In the first week of July, the warning of a mass passing along the coast of the state of São Paulo already indicated a drop of up to 5°C in temperatures in the Piracicaba region. The arrival of dry and cold air, typical of winter, occurred shortly after Piracicaba recorded the wettest June in 10 years. Cold x Air Humidity: understand the relationship Piracicaba did not record rain in the first ten days of July this year. ?Do you know why the climate gets drier in winter? Understand how temperature affects relative humidity, below. The interior of São Paulo (SP), including cities in the g1 Piracicaba coverage area and region, is part of the National Institute of Meteorology's warning of danger for low air humidity between this Monday and Wednesday. Less rain In winter, the frequency of rain decreases, and there may be intervals of more than 10 days between one episode of rain and another. This contributes to low relative humidity. For each temperature, there is a maximum amount of water vapor that can remain in this condition, of vapor, explains the meteorologist at the Center for Meteorological and Climate Research at Unicamp (Cepagri), Bruno Bainy. "This is what we call the saturation mixing ratio. Higher temperatures allow for a greater quantity of water vapor. In tropical and equatorial regions, for example, a greater quantity of water vapor is reached in the atmosphere. In polar and subtropical regions, on the other hand, where temperatures are lower, there is less presence of water vapor", he compares. Bruna exemplifies that, at the poles, the typical saturation value, when the full water vapor presence capacity is reached, is four grams of vapor per kilogram of air. In equatorial regions, there are 20 grams of water vapor per kilogram of air. Days in a row without rain, the arrival of cold air masses, alternating with the arrival of dry air masses, makes winter a typical season for low air humidity. Piracicaba See below, in the forecast, what the temperatures will be in the coming days according to Inmet. Wednesday (15): minimum of 8°C and maximum of 25°C Thursday (16): minimum of 10°C and maximum of 28°C Friday (17): minimum of 11°C and maximum of 27°C Saturday (18): minimum of 13°C and maximum of 29°C Sunday (19): minimum of 14°C and maximum of 29°C Limeira Wednesday (15): minimum of 8°C and maximum of 26°C Thursday (16): minimum of 10°C and maximum of 26°C Friday (17): minimum of 11°C and maximum of 26°C Saturday (18): minimum of 12°C and maximum of 27°C Sunday (19): minimum of 14°C and maximum of 28°C Piracicaba had the wettest June in ten years, points out Esalq-USP Claudia Assencio/g1 VIDEOS: Everything about Piracicaba and the region See more news from the region on g1 Piracicaba