* Q3 GDP rises 2 pct quarter/quarter
* Agriculture, mining, manufacturing buoys growth
* Political uncertainty still a concern (Adds analysts quotes, details)
PRETORIA, Dec 5 (Reuters) - South Africa's economy grew more than expected in the third quarter as the agricultural sector continued to recover from a severe drought while mining and manufacturing also improved, lifting hopes the country may avoid further credit downgrades.
Last month S&P Global Ratings cut Pretoria's local currency debt to "junk" status while the foreign currency debt was cut deeper into speculative territory, citing a deterioration in the country's economic outlook and public finances. Moody's placed South Africa on review for a downgrade.
Africa's most industrialized economy expanded quarter on quarter at a 2 percent seasonally-adjusted annual rate in the three-months to the end of September after its second-quarter growth was revised to 2.8 percent.
Economists polled by Reuters had expected quarterly growth of 1.5 percent. The rand inched firmer after the data, advancing 0.17 percent to 13.5000 per dollar at 1334 GMT.
"All in all, todays data was a very positive result for South Africas long-suffering economy. Despite a very weak first quarter, growth will probably exceed consensus expectations in 2017 as a whole," Capital Economics Africa economist John Ashbourne said in a note.
"More importantly, the increased momentum picked up in the middle of 2017 supports our view that growth will remain strong going into next year."
Farming led the way by recovering from the drought with 44.2 percent growth during the quarter, while major sectors of mining, manufacturing and financial services also showed steady growth.
"In agriculture the increase was largely driven by production of field crops as well as products in the horticulture environment," the country's new Statistician General Risenga Maluleke said.
The growth in the second quarter lifted the country from its first recession in nearly a decade. The economy had contracted 0.6 percent in the first three months of the year, following a 0.3 percent easing in the last quarter of 2016.
The Treasury in October cut South Africa's 2017 growth forecast to 0.7 percent and said annual growth would remain below 2 percent for the next three years, as policy uncertainty had knocked investor confidence.
Political uncertainty is growing before an African National Congress (ANC) conference this month to elect a new party leader to succeed President Jacob Zuma.
Also hurting investor confidence were allegations of corruption in state-owned companies and claims of influence-peddling in government.
"Depressed consumer and business confidence in a still extremely fluid and uncertain political environment suggests that this is unlikely to change until more clarity emerges post the ANC elective conference," BNP Paribas South Africa economist Jeff Schultz said.
"The structural issues the economy is facing are large, and tough decisions will have to be made fast by the new leadership in order plug these holes and prevent the economy from slipping over its current fiscal and credit ratings cliff." (Editing by James Macharia and Peter Graff)