San Simon weather by month
What a typical year looks like in San Simon, Arizona: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at San Simon, 3 km from San Simon; records cover 1903–2026.
The year at a glance
- Precipitation a year
- 10.3 in262 mm
- Snow a year
- 1.2 in3 cm
- Last spring freeze
- Apr 18
- First fall freeze
- Oct 29
- Heating degree days
- 2,729
- Cooling degree days
- 1,983
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 16°−9° (heating, 99%) and 106°41° (cooling, 1%).
Month by month
San Simon in January
Highs average 61°16° and lows 28°−2°, with 0.92 in23 mm of precipitation and 0.5 in1.3 cm of snow in a typical January.
- Record high
- 82°28° (1905)
- Record low
- −5°−21° (1913)
- Heating degree days
- 646
- Cooling degree days
- 0
San Simon in February
Highs average 66°19° and lows 31°−1°, with 0.79 in20 mm of precipitation and 0.2 in0.5 cm of snow in a typical February.
- Record high
- 88°31° (1904)
- Record low
- 0°−18° (2011)
- Heating degree days
- 465
- Cooling degree days
- 0
San Simon in March
Highs average 74°23° and lows 36°2°, with 0.48 in12 mm of precipitation in a typical March.
- Record high
- 98°37° (2026)
- Record low
- 9°−13° (1913)
- Heating degree days
- 324
- Cooling degree days
- 2
San Simon in April
Highs average 81°27° and lows 41°5°, with 0.24 in6.1 mm of precipitation in a typical April.
- Record high
- 99°37° (1989)
- Record low
- 17°−8° (1945)
- Heating degree days
- 140
- Cooling degree days
- 28
San Simon in May
Highs average 90°32° and lows 49°9°, with 0.12 in3 mm of precipitation in a typical May.
- Record high
- 108°42° (2002)
- Record low
- 24°−4° (1950)
- Heating degree days
- 24
- Cooling degree days
- 166
San Simon in June
Highs average 99°37° and lows 59°15°, with 0.44 in11 mm of precipitation in a typical June.
- Record high
- 114°46° (1994)
- Record low
- 32°0° (2020)
- Heating degree days
- 0
- Cooling degree days
- 413
San Simon in July
Highs average 98°37° and lows 66°19°, with 2.2 in56 mm of precipitation in a typical July.
- Record high
- 111°44° (2003)
- Record low
- 45°7° (2008)
- Heating degree days
- 0
- Cooling degree days
- 527
San Simon in August
Highs average 96°35° and lows 65°18°, with 1.9 in49 mm of precipitation in a typical August.
- Record high
- 109°43° (2025)
- Record low
- 47°8° (1913)
- Heating degree days
- 0
- Cooling degree days
- 474
San Simon in September
Highs average 92°33° and lows 59°15°, with 0.9 in23 mm of precipitation in a typical September.
- Record high
- 105°41° (1945)
- Record low
- 36°2° (2017)
- Heating degree days
- 2
- Cooling degree days
- 305
San Simon in OctoberThis month
Highs average 83°28° and lows 46°8°, with 0.76 in19 mm of precipitation in a typical October.
- Record high
- 99°37° (2003)
- Record low
- 18°−8° (2020)
- Heating degree days
- 91
- Cooling degree days
- 66
San Simon in November
Highs average 70°21° and lows 34°1°, with 0.55 in14 mm of precipitation and 0.2 in0.5 cm of snow in a typical November.
- Record high
- 88°31° (1913)
- Record low
- 10°−12° (2010)
- Heating degree days
- 388
- Cooling degree days
- 2
San Simon in December
Highs average 60°16° and lows 28°−2°, with 1 in25 mm of precipitation and 0.3 in0.8 cm of snow in a typical December.
- Record high
- 80°27° (1913)
- Record low
- 5°−15° (1953)
- Heating degree days
- 649
- Cooling degree days
- 0