Weather and climate in São Paulo, Brazil: monthly averages and best time for stargazing

Best for stargazingJul, Aug, JunMost clear, dark hours

Warmest monthDecemberAverage high 27°C

Coolest monthJulyAverage low 10°C

Wettest monthJanuary230 mm on average

What the weather is like in São Paulo

The warmest month in São Paulo is December, with average highs of 27°C. The coolest is July, when nights average 10°C. About 1,351 mm of rain and snow falls in a typical year, most in January and least in August.

Skies are clearest in August (47% average cloud cover) and cloudiest in January (78%). Combining cloud with the length of truly dark nights, July, August, June offer the most clear, dark hours for stargazing.

Clear, dark hours per night

1.7 Jan

2.7 Feb

3.2 Mar

4.3 Apr

4.4 May

5.0 Jun

5.5 Jul

5.4 Aug

3.9 Sep

2.6 Oct

2.0 Nov

1.8 Dec

Hours of full astronomical darkness in mid-month, multiplied by the average share of clear sky. A rough guide to how much good observing time a typical night offers.

Monthly averages

Month	High	Low	Precipitation	Cloud cover	Humidity	Wind	Dark hours
January	27°C	18°C	230 mm	78%	83%	8 km/h	7.8 h
February	27°C	18°C	173 mm	69%	83%	7 km/h	8.5 h
March	26°C	17°C	145 mm	65%	85%	8 km/h	9.3 h
April	25°C	15°C	84 mm	57%	84%	7 km/h	10.0 h
May	22°C	12°C	67 mm	57%	84%	7 km/h	10.4 h
June	22°C	11°C	58 mm	53%	82%	7 km/h	10.6 h
July	22°C	10°C	61 mm	48%	79%	8 km/h	10.5 h
August	24°C	11°C	36 mm	47%	75%	8 km/h	10.1 h
September	26°C	13°C	68 mm	59%	73%	10 km/h	9.5 h
October	27°C	15°C	105 mm	71%	75%	10 km/h	8.8 h
November	26°C	15°C	148 mm	75%	79%	10 km/h	8.0 h
December	27°C	17°C	177 mm	77%	81%	9 km/h	7.5 h

Climate averages: NASA POWER, 2001–2025, for the grid area around -23.50, -46.88 (about 50 km across). High and low temperatures are estimated from the monthly mean and the average daily range. Hills, coasts and cities can differ from the area average. Sources and methods.