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Average daytime highs range between 65 and 70 °F (18 and 21 °C), with overnight lows between 40 and 44 °F (4 and 7 °C). Tucson typically averages three hard freezes per winter season, with temperatures dipping to the mid- or low 20s (−7 to −4 °C), but this is typically limited to only a very few nights.
4. Re: Temperature and Outdoor Swimming in Tucson. Later September or October, yes. Tucson has a wide variation from high to low temperature in a day, and then a pool needs an extended warmer period in order to actually warm up.
Here in Tucson a normal temperature differential is 30-40 degrees F between peak day and overnight low. For example today it will be 67F high and 39F low. For example today it will be 67F high and 39F low.
Here is a chart from the National Weather Service showing daily averages and record highs and lows. Do take notice, though, that most of the record highs have been in the 1990s and 2000s, while the record lows were mostly in the earlier 1900s
Climate data for Tucson, Arizona (Tucson Int'l), 1991–2020 normals, extremes 1894−presentMonth Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Record high °F (°C)
So-called "average" temperatures range from 65F to 70F, with highs right around 100F. But humidity in June is almost always in the 5% to 10% range, which makes it feel cooler than it actually is. But also be prepared for temperatures above 105F during the hottest part of the day. You can check out the averages and extremes at this site:
The average daily temperatures of Yuma, which is located near Arizona's southwestern corner, range from 43 to 67 °F (6 to 19 °C) in January, and from 81 to 107 °F (27 to 42 °C) in July. In Flagstaff, located in the state's central interior, the average daily temperatures range from 14 to 41 °F (−10 to 5 °C) during January, and from 50 ...
The weather temps will be nice and perfect (high 70s) yet for an unheated pool, it will be cold ( as cold as the 60s). Last year in March 2007, Tucson had a kinda of unseasonal snow storm that dropped enough inches of snow to cover the cacti, brush and vegetation that left many Tucsonians in a self-induced dream of winterwonderland for the AM.