Current Conditions

São Sebastião, São Paulo

65°F19°C

Clear

Wind

E 3 mph5 km/h

Humidity

82%

Cloud Cover

29%

As of Wednesday, September 2, 2026 at 9:00 PM GMT-3

Today's Outlook

Night

Mostly clear, with a low around 64°F18°C. Breezy from the ENE at 7 to 10 mph12 to 16 km/h.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Clear	High 72°F22°C	Low 64°F18°C	Precip 0 in0 mm—	Cloud 10%	Wind ENE 9 mph14 km/h	Thursday: Mostly clear and warm, with a high of 72°F22°C and morning low of 64°F18°C. Breezy from the ENE at 10 to 11 mph16 to 18 km/h. Thursday Night: Mostly clear, with a low around 64°F18°C. Breezy from the ENE at 7 to 10 mph12 to 16 km/h.
Showers	High 78°F25°C	Low 68°F20°C	Precip 0.03 in0.7 mm50%	Cloud 23%	Wind WSW 6 mph10 km/h	Friday: Mostly clear and warm, with a high of 78°F25°C and morning low of 68°F20°C. Breezy from the WSW at 6 to 8 mph10 to 14 km/h. Friday Night: Partly cloudy, with a low around 68°F20°C. Breezy from the W at 6 to 8 mph10 to 12 km/h. 50% chance of showers in the evening.
Light Rain	High 68°F20°C	Low 67°F19°C	Precip 0.42 in10.7 mm97%	Cloud 89%	Wind ESE 6 mph10 km/h	Saturday: Overcast and warm, with a high of 68°F20°C. Breezy from the ESE at 7 to 8 mph11 to 13 km/h. 85% chance of light rain throughout the day. Humid. Saturday Night: Overcast, with a low around 67°F19°C. Breezy from the ESE at 5 to 7 mph8 to 11 km/h. 97% chance of light rain throughout the night.
Rain	High 67°F19°C	Low 60°F16°C	Precip 1.07 in27.3 mm100%	Cloud 100%	Wind S 11 mph17 km/h	Sunday: Overcast and mild, with a high of 64°F18°C. Breezy from the S at 11 to 12 mph18 to 19 km/h. 100% chance of rain throughout the day. Sunday Night: Overcast, with a low around 60°F16°C. Breezy from the S at 10 to 12 mph17 to 20 km/h. 100% chance of rain throughout the night.
Rain	High 62°F16°C	Low 60°F15°C	Precip 0.43 in11 mm100%	Cloud 98%	Wind SE 7 mph12 km/h	Monday: Overcast and mild, with a high of 62°F16°C. Breezy from the SE at 7 mph11 km/h. 91% chance of light rain throughout the day. Monday Night: Overcast, with a low around 60°F15°C. Breezy from the SE at 8 to 9 mph13 to 15 km/h. 100% chance of rain throughout the night.
Light Rain	High 67°F20°C	Low 62°F17°C	Precip 0.25 in6.4 mm92%	Cloud 85%	Wind E 9 mph15 km/h	Tuesday: Overcast and mild, with a high of 67°F20°C and morning low of 63°F17°C. Breezy from the E at 10 to 11 mph16 to 17 km/h. 88% chance of light rain throughout the day. Tuesday Night: Overcast, with a low around 62°F17°C. Breezy from the ENE at 9 to 10 mph15 to 16 km/h. 92% chance of light rain throughout the night.
Light Rain	High 69°F21°C	Low 66°F19°C	Precip 0.25 in6.3 mm52%	Cloud 75%	Wind ENE 6 mph10 km/h	Wednesday: Mostly cloudy and warm, with a high of 69°F21°C. Breezy from the E at 6 to 7 mph9 to 12 km/h. 52% chance of light rain throughout the day. Wednesday Night: Mostly cloudy, with a low around 66°F19°C. Breezy from the ENE at 7 to 8 mph11 to 13 km/h. 50% chance of light rain throughout the night.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	ThursdaySep 3	72°F22°C	64°F18°C	0 in0 mm· —	10%	Clear	ENE 9 mph14 km/h
DayMostly clear and warm, with a high of 72°F22°C and morning low of 64°F18°C. Breezy from the ENE at 10 to 11 mph16 to 18 km/h. NightMostly clear, with a low around 64°F18°C. Breezy from the ENE at 7 to 10 mph12 to 16 km/h.
	FridaySep 4	78°F25°C	68°F20°C	0.03 in0.7 mm· 50%	23%	Showers	WSW 6 mph10 km/h
DayMostly clear and warm, with a high of 78°F25°C and morning low of 68°F20°C. Breezy from the WSW at 6 to 8 mph10 to 14 km/h. NightPartly cloudy, with a low around 68°F20°C. Breezy from the W at 6 to 8 mph10 to 12 km/h. 50% chance of showers in the evening.
	SaturdaySep 5	68°F20°C	67°F19°C	0.42 in10.7 mm· 97%	89%	Light Rain	ESE 6 mph10 km/h
DayOvercast and warm, with a high of 68°F20°C. Breezy from the ESE at 7 to 8 mph11 to 13 km/h. 85% chance of light rain throughout the day. Humid. NightOvercast, with a low around 67°F19°C. Breezy from the ESE at 5 to 7 mph8 to 11 km/h. 97% chance of light rain throughout the night.
	SundaySep 6	67°F19°C	60°F16°C	1.07 in27.3 mm· 100%	100%	Rain	S 11 mph17 km/h
DayOvercast and mild, with a high of 64°F18°C. Breezy from the S at 11 to 12 mph18 to 19 km/h. 100% chance of rain throughout the day. NightOvercast, with a low around 60°F16°C. Breezy from the S at 10 to 12 mph17 to 20 km/h. 100% chance of rain throughout the night.
	MondaySep 7	62°F16°C	60°F15°C	0.43 in11 mm· 100%	98%	Rain	SE 7 mph12 km/h
DayOvercast and mild, with a high of 62°F16°C. Breezy from the SE at 7 mph11 km/h. 91% chance of light rain throughout the day. NightOvercast, with a low around 60°F15°C. Breezy from the SE at 8 to 9 mph13 to 15 km/h. 100% chance of rain throughout the night.
	TuesdaySep 8	67°F20°C	62°F17°C	0.25 in6.4 mm· 92%	85%	Light Rain	E 9 mph15 km/h
DayOvercast and mild, with a high of 67°F20°C and morning low of 63°F17°C. Breezy from the E at 10 to 11 mph16 to 17 km/h. 88% chance of light rain throughout the day. NightOvercast, with a low around 62°F17°C. Breezy from the ENE at 9 to 10 mph15 to 16 km/h. 92% chance of light rain throughout the night.
	WednesdaySep 9	69°F21°C	66°F19°C	0.25 in6.3 mm· 52%	75%	Light Rain	ENE 6 mph10 km/h
DayMostly cloudy and warm, with a high of 69°F21°C. Breezy from the E at 6 to 7 mph9 to 12 km/h. 52% chance of light rain throughout the day. NightMostly cloudy, with a low around 66°F19°C. Breezy from the ENE at 7 to 8 mph11 to 13 km/h. 50% chance of light rain throughout the night.
	ThursdaySep 10	72°F22°C	68°F20°C	0.47 in12 mm· 66%	91%	Rain	NE 7 mph11 km/h
DayOvercast and warm, with a high of 72°F22°C. Breezy from the NE at 6 to 7 mph10 to 11 km/h. 62% chance of light rain throughout the day. Humid. NightOvercast, with a low around 68°F20°C. Breezy from the NNE at 7 to 8 mph11 to 13 km/h. 66% chance of rain throughout the night.
	FridaySep 11	72°F22°C	68°F20°C	0.31 in8 mm· 40%	83%	Light Rain	WNW 8 mph12 km/h
DayOvercast and warm, with a high of 72°F22°C. Breezy from the SW at 8 mph13 km/h. 36% chance of light rain throughout the day. Humid. NightOvercast, with a low around 68°F20°C. Breezy from the N at 7 to 8 mph12 to 13 km/h. 40% chance of light rain throughout the night.
	SaturdaySep 12	71°F22°C	67°F20°C	0.2 in5.2 mm· 43%	81%	Light Rain	E 8 mph12 km/h
DayOvercast and warm, with a high of 71°F22°C. Breezy from the E at 8 to 9 mph13 to 15 km/h. 35% chance of light rain throughout the day. NightOvercast, with a low around 68°F20°C. Breezy from the ENE at 7 to 9 mph12 to 14 km/h. 43% chance of light rain throughout the night.
	SundaySep 13	70°F21°C	67°F19°C	0.38 in9.7 mm· 55%	79%	Light Rain	ESE 9 mph14 km/h
DayMostly cloudy and warm, with a high of 70°F21°C. Breezy from the ESE at 9 to 10 mph15 to 16 km/h. 55% chance of light rain throughout the day. NightOvercast, with a low around 67°F20°C. Breezy from the E at 9 mph14 km/h. 53% chance of light rain throughout the night.
	MondaySep 14	71°F22°C	67°F19°C	0.3 in7.6 mm· 48%	70%	Showers	E 8 mph13 km/h
DayMostly cloudy and warm, with a high of 71°F22°C and morning low of 67°F19°C. Breezy from the E at 8 to 9 mph14 to 15 km/h. 44% chance of showers throughout the day. NightMostly cloudy, with a low around 67°F19°C. Breezy from the ENE at 8 mph13 km/h. 48% chance of light rain throughout the night.
	TuesdaySep 15	73°F23°C	67°F20°C	0.22 in5.7 mm· 38%	64%	Showers	ENE 8 mph12 km/h
DayMostly cloudy and warm, with a high of 73°F23°C and morning low of 67°F20°C. Breezy from the E at 8 to 9 mph13 to 14 km/h. 38% chance of showers throughout the day. Humid. NightMostly cloudy, with a low around 68°F20°C. Breezy from the ENE at 7 to 8 mph12 to 13 km/h. 35% chance of showers throughout the night.
	WednesdaySep 16	73°F23°C	68°F20°C	0.2 in5.1 mm· 38%	65%	Showers	E 7 mph12 km/h
DayMostly cloudy and warm, with a high of 73°F23°C and morning low of 68°F20°C. Breezy from the ESE at 8 to 9 mph12 to 14 km/h. 35% chance of showers throughout the day. Humid. NightMostly cloudy, with a low around 68°F20°C. Breezy from the ENE at 7 to 8 mph12 to 12 km/h. 38% chance of showers throughout the night.
	ThursdaySep 17	72°F22°C	68°F20°C	0.19 in4.8 mm· 45%	71%	Light Rain	ESE 8 mph12 km/h
DayMostly cloudy and warm, with a high of 72°F22°C. Breezy from the ESE at 8 to 9 mph13 to 14 km/h. 45% chance of light rain throughout the day. Humid. NightMostly cloudy, with a low around 68°F20°C. Breezy from the ENE at 7 mph12 km/h. 35% chance of light rain throughout the night.

Nearby Cities

Ilhabela3 mi6 km Caraguatatuba10 mi16 km Paraibuna30 mi49 km Ubatuba31 mi50 km Salesópolis32 mi52 km Biritiba Mirim42 mi67 km

About This Forecast

This forecast is powered by WeatherMesh, the world's most advanced and accurate weather model powered by AI. WeatherMesh is built on proprietary data from WindBorne's Global Sounding Balloon constellation — the world's largest fleet of autonomous, long-duration weather balloons — collecting observations across 100% of Earth, including over oceans and remote regions where no other data exists.

WeatherMesh consistently outperforms legacy models in independent benchmarks. View Benchmarks →

Access WeatherMesh forecasts programmatically via our API. API Documentation →

How to Access Weather Forecasts

Pattern	Example	Description
/weather/{country}/{city}/	/weather/united-states/san-francisco/	City forecast (canonical URL)
/weather/{city}/	/weather/tokyo/	Shorthand — redirects to most populous match
/weather/{country}/{region}/{city}/	/weather/united-states/california/san-francisco/	With region — redirects to canonical
/weather/nearby?lat={lat}&lon={lon}	/weather/nearby?lat=48.1&lon=11.5	Find nearest city by coordinates
/weather/{country}/	/weather/germany/	Country index — all cities by region

Country and city names use lowercase slugs with hyphens (e.g. united-states, san-francisco). Arbitrary city names are supported — if not in our database, we geocode the name and serve the forecast for that location.

For programmatic access, use theWindBorne Forecast APIwhich returns structured JSON for any coordinates worldwide.

Coordinates: 23.7600°S, 45.4097°W·Elevation: 6m·Timezone: America/Sao_Paulo·Population: 81,595