Apple will unveil its next iPhone on June 20 and kick off sales in July. At least, that's the claim from Japanese Mac enthusiast site MacFan.

Marking its 20th anniversary as a Mac-oriented Web site, MacFan suggests that the next-generation iPhone will take the stage at a Apple event on Thursday, June 20. The new iPhone will then go on sale a few weeks later in early July, as reported by Electronista.

The report further claims that Apple will launch the much-rumored low-cost iPhone in August and target it as a pre-paid device for developing markets such as China and India.

Electronista dubs the rumor plausible but doesn't indicate where or how MacFan got its information.

A June or July launch timeframe for the iPhone 5S has been proposed by other Apple watchers and even a couple of analysts. Apple did release the original iPhone and the iPhone 3G, 3GS, and 4 during the June and July period and only switched to fall for the iPhone 4S and 5.

How does MacFan's claims stack up with other recent rumors?

Apple analyst Gene Munster expects the iPhone 5S to launch in late June, followed by the low-cost model in the September quarter.
KGI Securities analyst Ming-Chi Kuo believes Apple will announce the next iPhone in June and offer it for sale in July.
Japanese Apple blog Macotakara said earlier this month that production of the next iPhone had already gotten off the ground.
MacFan's report does echo those of other sources, though it's gone farther out on the limb by suggesting a specific launch date. And like most rumors, that one should be taken with a grain of salt.

A June 20 event would come hot on the heels of Apple's Worldwide Developers Conference, which typically runs throughout the second week of the month. In the past, Apple actually used WWDC to announce new iPhone models, including the iPhone 4, 3GS, and 3. So, if Apple returns to a June iPhone launch, an announcement during this year's WWDC seems the more likely timeframe.

Whatever the date, a summer debut for the next iPhone could be a good strategic move on Apple's part.