Last year the incredible snowpack was bolstered by a series of late season snow storms, which meant that many trails were impassable until July. That's not normal, and this year is shaping up to be very different. In a normal year January and February are dry, and we get most snowfall in March and April. This year virtually all the snow fell in January and February, with next to none so far in March. That bodes well for spring hiking, but means that by September water sources may be difficult to come by.
Back to your question about monsoon season. By no means does it stop us from enjoying the outdoors. Plan an early start each day, so that you can be off the peaks and below treeline by noon. Most storms will blow in after that.