Brazilian coffee areas started the week warm and dry with no intense cold forecast during the first 10 days of June, private forecaster Somar said on Monday. Conditions are ideal for harvesting.
A weak cold front which is due to reach the southern state of Parana on Wednesday will only bring some fleeting, rapid showers.
"This system will move off into the ocean on Thursday without bringing rain to other producer regions," Somar said in a daily report.
Another cold front will move through coffee areas between June 4-6, bringing some light rain between Parana and Sao Paulo but no sharp cold.
No frost is on the horizon, with temperatures only dipping on Thursday to 8 Celsius (46 Fahrenheit) in the Pocos de Caldas district of south Minas - the coldest area.
Harvesting has started in nearly all areas. Last Thursday, private analysts Safras e Mercado said that 12 percent of the crop had been picked.
Arabica harvesting is still at an initial stage with only 5 percent picked, but 34 percent of robustas have been gathered.
Safras e Mercado last week revised down its crop forecast by 9 percent to 43.5 million 60-kg bags because of unfavourable weather in January and February.
In May, the southern parts of Espirito Santo and Bahia as well as the forested coffee area of Minas Gerais have had more rain than average, but Mogiana, the Minas Cerrado and the Pocos de Caldas area of south Minas were relatively dry.
On April 7, the government revised down its 2006/07 (July/June) crop forecast to 40.62 million 60-kg bags, from 42 million bags seen in December, due to drought earlier in the year in the forested coffee area of Minas Gerais.
But Brazil's crop will still be 23.3 percent higher than the 32.94 million bags produced in 2005/06 due to the upturn in arabica's biennial crop cycle and increased crop care.
The government estimate was at the lower end of domestic trade views of between 40 million and 44 million bags.