It has been rising long before this
It has been rising as of July 15
I would speculate several reasons, one is the housing market which doubled over the years, but in other countries has tripled and we see that US has been hit, and interest rates have been lowered, however I think we are now seeing a delayed reaction due to the housing markets in other countries which have tripled aka UK etc. and because the interest rate differential is still such UK 5.0 and US 2.0 so US does not have much to trim, however others countries such as UK 5.0 interest rates have not been hit as hard but I believe that people are counting on those interest rates to be lowered and so as other countries currency is also weakened against the dollar, I don't know for sure if the Dollar is actually strengthening, however I would speculate that it's more likely the other countries currency is weakening against the dollar which in essence is the same effect which is dollar shows as strengthening.
I'm no expert but this is what I've been reading.
Also there are lots of technical traders out there who trade from the daily charts and as a downward support level get broken such as the EUR/USD then these technical traders are prompted to sell currency and buy the dollar
Weekly support is also getting broke and prompting stonger dollar for technical traders.
See the daily charts of the EUR/USD and notice the downward waves, and a current Down AB, and now a C Fibonacci level high forming, this will prompt techinical traders to sell Eur/USD and be looking for a Break of the B low and continue to the D extension.
I'm a technical trader, however I'm a daily trader who trades 5min charts, but I'm aware of the technical analysis of these different levels.
Most technical traders trading the EUR/USD may be looking for a target of approx 1.3237 for the small (abcd) and next target of 1.2536 for the larger (ABCD)
Being watchful of support at B low of 1.3874 approx.;and if it breaks the B low at 1.3874 technical traders will be looking for those targets I've mentioned above.
I'm not sure I fully understand my own fundamental analysis above, but that is the general gist from what I've read, however I'm more familiar with the technical side.
Anyhow I hope this helps, and again I believe this is something to do with the delay in the housing/financial problems which is now become more apparent in the other countries