According to the National Weather Service, the average temperature last month in Phoenix was 66 degrees, tying a record set in 1991. The Valley is also coming off its hottest-ever December (62.3 degrees), October (84.5), September (94.6) and June (97).
This February ended up tying, with 1991, for the hottest February on record for Phoenix, Arizona. The average temperature for February 2025 was 66°. #azwx pic.twitter.com/6w4u3dD4QM
— NWS Phoenix (@NWSPhoenix) March 2, 2025
March, however, is off to a cooler start. Through three full days of the month, Phoenix is averaging 66.2 degrees, which would be tied for the 20th-highest in history. Things will warm up as the month progresses, of course, but record-high temperatures aren’t expected to continue, according to NWS meteorologist Alicia Ryan.
Until mid-March, the Valley will rotate from “a cooldown to a warm-up period,” Ryan said. In mid-March, Phoenix will start seeing “more of a prolonged warmer period rather than flopping back and forth between cold and warm,” with temperatures in the mid-to-high-70s.
It’d have to heat up a lot to catch the hottest Marches in Phoenix history. The hottest was March 2004, with an average temperature of 72.3 degrees. Next was 2015, by just a hair — it sat at 72.2 degrees.
Hottest months of March in Phoenix
Here are the hottest months of March in Valley history by average temperature.
10. 1986 — 69.3 degrees
9. 1997 — 69.4 degrees
Tie-7. 2016 — 69.5 degrees
Tie-7. 2013 — 69.5 degrees
6. 1934 — 70 degrees
5. 1989 — 70.1 degrees
4. 1972 — 70.5 degrees
3. 2017 — 70.7 degrees
2. 2015 — 72.2 degrees
1. 2004 — 72.3 degrees
