This is an archived article that was published on sltrib.com in 2016, and information in the article may be outdated. It is provided only for personal research purposes and may not be reprinted.

Utah is sighing into a period of perfect fall weather, and the state's denizens can thank heaven, a building high pressure front, or perhaps both for that.

Monday dawned a chilly 46 in Salt Lake City ahead of a forecast high of 68 degrees under clear, sunny skies. The Wasatch Front expected lows in the mid-50s and highs in the mid- to upper-70s Tuesday and again on Wednesday.

However, such spells of idyllic autumn conditions always are painfully transitory, "Autumn is as joyful and sweet as an untimely end," was how 19th century French poet Rémy de Gourmont put it.

The National Weather Service says the high pressure front — and those idyllic autumn conditions — will give way at midweek to a storm system moving up from the south, though daytime temperatures will remain in the mid- to upper-70s.

In southern Utah, St. George's thermometers registered 57 degrees as the sun rose over the redrocks Monday, with a high of 84 forecast. Utah's Dixie looked for upper-80s (and lows in the upper-50s) on Tuesday, with the skies turning cloudy, with a slight chance of showers, on Wednesday with highs correspondingly retreating a few degrees.

The Utah Division of Air Quality awarded "green," or healthy grades to all areas of the state into the midweek.

The Intermountain Allergy & Asthma website reported that while sagebrush was "very high," ragweed "high," and mold "moderate" on its pollen index as of Monday, other allergens were either "low" or didn't register.

For more extensive forecast information, visit The Salt Lake Tribune's weather page at: http//www.sltrib.com/weather/.

Twitter: @remims