San Tan Valley Climate by Month
San Tan Valley, Arizona, United States
Very hot summers and cool winters, with little rain.
The climate in San Tan Valley is one of very hot summers and cool winters, with little rain. Expect highs of 106°F (41°C) in July and 67°F (19°C) in January, with the coldest nights (December) near 39°F (4°C). It gets only 9.0 in (228 mm) of rain a year. April to June are almost completely dry. The air is dry, averaging 32% relative humidity.
- Warmest month
- 106°F(41°C)
- Average high, July
- Coldest nights
- 39°F(4°C)
- Average low, December
- Rain per year
- 9.0 in(228 mm)
- No clear rainy season
- Humidity
- 32%
- Sunniest: June
Best and worst months in San Tan Valley
Best for weatherThe most comfortable weather comes in March and November, with highs around 77°F (25°C) and about 0.8 in (21 mm) of rain a month.
Least pleasantJuly and August are the least pleasant; July is the hottest, with highs of 106°F (41°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in November.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
San Tan Valley weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 67°F(19°C) | 39°F(4°C) | 0.9 in(23 mm) | 44% | 3.2 |
| FebFebruary | 70°F(21°C) | 42°F(6°C) | 1.0 in(25 mm) | 39% | 3.9 |
| MarMarchBest | 77°F(25°C) | 46°F(8°C) | 0.9 in(24 mm) | 32% | 5.5 |
| AprApril | 85°F(30°C) | 51°F(11°C) | 0.3 in(8 mm) | 25% | 6.8 |
| MayMay | 94°F(34°C) | 60°F(15°C) | 0.2 in(4 mm) | 22% | 7.7 |
| JunJune | 102°F(39°C) | 68°F(20°C) | 0.1 in(2 mm) | 19% | 8.0 |
| JulJuly | 106°F(41°C) | 76°F(25°C) | 1.2 in(30 mm) | 30% | 7.0 |
| AugAugust | 104°F(40°C) | 76°F(25°C) | 1.1 in(28 mm) | 35% | 6.3 |
| SepSeptember | 100°F(38°C) | 71°F(22°C) | 0.7 in(18 mm) | 31% | 5.8 |
| OctOctober | 91°F(33°C) | 58°F(15°C) | 0.7 in(19 mm) | 27% | 4.8 |
| NovNovemberBest | 78°F(25°C) | 46°F(8°C) | 0.7 in(17 mm) | 32% | 3.6 |
| DecDecember | 67°F(20°C) | 39°F(4°C) | 1.2 in(30 mm) | 44% | 2.9 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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