PHOENIX -- A ridge of high pressure building into Arizona from the west will force temperatures to climb to the upper 90s around the Valley by the end of the week and into the start of the weekend.Thursday afternoon, Phoenix Sky Harbor recorded a daytime high of 92 degrees after a morning low of 69.While a dry northwesterly flow will allow temperatures to dip back into the 60s around the Valley Friday morning, daytime highs will top out in the upper 90s during the afternoon.The average high for this time of year in Phoenix is 94. The high Friday is expected to reach 96, with highs peaking Saturday afternoon to around 97.By Sunday, the ridge will start to slowly weaken. This will lead to a very gradual cooling trend through next week, with daytime highs around the Valley dropping to the low 90s by Wednesday.In the high country, morning lows will range from the 30s in Flagstaff, to the 40s in Prescott. Daytime highs will range from the 70s to 80s. Skies will remain mainly clear across the state.