Climate and monthly weather forecast
Guarulhos, Brazil

Embarked in the southern fringes of Brazil, Guarulhos grapples with a Cfa type of climate, as per the Köppen climate classification. This category is earmarked for regions swathed in humid subtropical atmosphere without a dry season. All year round, the city manifests high temperatures, concurrent with significant precipitation.

Variances in the climatic parameters ensue throughout the year. Monthly average temperatures range from a high peak at 28°C (82.4°F) down to a low of 20°C (68°F). Punctuating the year, January and February hit the highest notch in temperature, topping at 28°C (82.4°F) while July registers the lowest, dipping to 21°C (69.8°F). Contrary to some anticipations about tropical locations, Guarulhos has no month without rainfall. January has the highest number of rainy days, 14 in total, while July experiences the least with 6.

Throughout the year, daylight varies moderately, extending from a maximum of 13.6 hours in December, down to a minimum of 10.7 hours in June. A distinctive pattern crystallizes during June to August when the city experiences more daylight hours compared to the preceding months.

Aligning vacation schedules to Guarulhos' climate implies cognizance of the city's weather patterns. Between May and August, temperatures are relatively milder with highs oscillating from 21°C (69.8°F) to 23°C (73.4°F) and lows hovering around from 12°C (53.6°F) to 14°C (57.2°F). Concurrently, these months record the least number of rainy days, swinging from 6 to 7, hence visitors can relish more outdoor activities without disruption by incessant rainfall. With daylight hours stretching up to 11.5 hours in May, and extending progressively to 12.3 hours in August, tourists can savor extended daylight for longer exploration.

Frequent travelers ought to evade the month of January in Guarulhos. The stakes are high during this month with temperatures peaking at 28°C (82.4°F) amid 14 rainfall days. Thus, the likelihood of experiencing frequent rain interruptions, complemented by energy-sapping high temperatures, cloud the prospects of a prime vacation experience during this month.

September ushers in the spring in Guarulhos, marked by a slight rise in temperatures, with highs oscillating from 23°C (73.4°F) to 24°C (75.2°F) and lows fluctuating from 14°C (57.2°F) to 16°C (60.8°F). Rainfall patterns manifest moderate increase as well, with 9 and 10 rainfall days in September and October respectively. Additionally, daylight stretches from 12 hours in September to 13.3 hours in November, increasing outdoor activity hours.

December announces the arrival of summer in Guarulhos. Between December to February, temperatures soar from 27°C (80.6°F) to 28°C (82.4°F) on the high end and from 18°C (64.4°F) to 20°C (68°F) on the low end. Rainy days spike up in January, with around 14 days, while December and February record 13 and 9 rainy days, respectively. Daylight is relatively longer during the summer, from a high of 13.6 hours in December to a low of 12.9 hours in February.

March pitches the inception of autumn in Guarulhos. With temperatures ranging from a high of 27°C (80.6°F) to 25°C (77°F) and lows from 19°C (66.2°F) to 18°C (64.4°F), autumn presents a moderate climate. Rainfall days hover around from 11 in March to 7 in May. Daylight hours shorten gradually from 12.2 hours in March to 11 hours in May.

Winter barges into Guarulhos’ landscape in June. High temperatures fluctuate from 23°C (73.4°F) in June to 21°C (69.8°F) in July, then do a subtle rebound to 22°C (71.6°F) in August. Low temperatures stoop to 13°C (55.4°F) in June and then down to 12°C (53.6°F) in July and August. Number of rainfall days hallmarks a decline, tracing from 7 days in June and July to a minimum of 6 in August. Daylight hours are the briefest between June and August, elongating from 10.7 hours in June to 11.3 hours in August.

The year kicks off in Guarulhos, Brazil, with conditions that are both mild-to-warm and slightly damp. Temperature fluctuations remain minimal, with a peak at 27°C (80.6°F) and a drop to 20°C (68°F). Distinctively more rainfall saturates January, with 14 days of precipitation compared to the following months. Weather in January »

In February, the weather in Guarulhos presents minimal temperature changes compared to January. February boasts slightly fewer rainfall days, totaling only 9 days, marking a gentle decline in comparison to the preceding month. Weather in February »

March brings a noticeable shift in Guarulhos' weather pattern, as it transitions from summer into autumn. Temperatures show some cooling, particularly at night, reaching a lower limit of 19°C (66.2°F). Precipitation makes a modest resurgence with an increment to 11 rainfall days. Weather in March »

April's arrival signals a significant transition in Guarulhos' weather, with temperatures, rainfall, and daylight hours all undergoing noteworthy reductions. The lower range of temperatures enters a cooler realm, going down to 18°C (64.4°F). Weather in April »

By the time May rolls around in Guarulhos, a cool and dry atmosphere is well-established as the norm. Temperatures continue their downward trend, hitting a dip at 23°C (73.4°F) on the high end and 14°C (57.2°F) on the low end. Rainfall days remain moderate at 7 days. Weather in May »

As the midway point of the year, June maintains the cooler and drier weather patterns initiated in May. Temperatures continue to drop, with chillier nights that reach a low of 13°C (55.4°F). Despite the noticeable chill, rainfall hovers at a steady 7 days, identical to May. Weather in June »

July's weather in Guarulhos can be described as the year's cool core, with the lowest temperature point of 12°C (53.6°F). Moderate rainfall persists with only 6 rainfall days, matching April for the fewest of the year. Lengthy daylight hours begin to make a comeback at 10.8 hours per day. Weather in July »

The weather in Guarulhos during August embodies the onset of transitioning from cooler to warmer conditions. It features a recurring low temperature of 12°C (53.6°F), tying with July. However, a slight temperature increase is detectable on the high end, peaking at 22°C (71.6°F). Weather in August »

September in Guarulhos is marked by more pronounced signs of spring, including warmer temperatures and incrementing precipitation thresholds. The maximum temperature climbs a tad higher to 23°C (73.4°F). An escalation is also apparent on the rainfall front with an uptick to 9 rainfall days. Weather in September »

In October, Guarulhos's weather is characterized by further warming trends and a stabilized rainfall pattern. A substantial increase is again observed in the maximum temperature, which mounts up to 24°C (75.2°F). Simultaneously, precipitation remains somewhat constant, with the rainfall days tally notching up to 10 days. Weather in October »

November witnesses the return of summertime warmth in Guarulhos, with both high and low temperatures continuing their upward trajectory. The imminent approach of summer is marked by a peak temperature of 26°C (78.8°F). Yet, the rainfall days remain constant at 10 days, much like in October. Weather in November »

December in Guarulhos culminates in the height of summer, with the year's highest temperature and rainfall parameters coming into play. From the temperature perspective, a high of 27°C (80.6°F) is registered, on par with January. Weather in December »