The regional crop specialist in the southeast at Weyburn, Sherri Roberts, says some farmers were in the field as early as Saturday.
She says there is some concern wheat crops will be downgraded because of the rain.
She adds some crops are late maturing and frost could cut soybean yields by 10 to 20 percent.
Roberts says many yields are above average despite extremely dry weather this spring.
She says harvest ranges from 10 to 75 percent complete in the southeast.
She expects harvest may not wrap up til mid-October.