Casa Grande Climate by Month
Casa Grande, Arizona, United States
Very hot summers and cool winters, with little rain.
Casa Grande has very hot summers and cool winters, with little rain. Afternoon highs range from 68°F (20°C) in December to 107°F (42°C) in July, and December nights average 38°F (3°C). It gets only 7.6 in (192 mm) of rain a year. April to June are almost completely dry. The air is dry, averaging 33% relative humidity.
- Warmest month
- 107°F(42°C)
- Average high, July
- Coldest nights
- 38°F(3°C)
- Average low, December
- Rain per year
- 7.6 in(192 mm)
- No clear rainy season
- Humidity
- 33%
- Sunniest: June
Best and worst months in Casa Grande
Best for weatherThe most comfortable weather comes in February, March and November, with highs around 77°F (25°C) and about 0.7 in (17 mm) of rain a month.
Least pleasantJuly and August are the least pleasant; July is the hottest, with highs of 107°F (42°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 February.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Casa Grande weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 69°F(21°C) | 38°F(4°C) | 0.7 in(18 mm) | 43% | 3.2 |
| FebFebruaryBest | 72°F(22°C) | 41°F(5°C) | 0.7 in(19 mm) | 45% | 3.9 |
| MarMarchBest | 79°F(26°C) | 46°F(8°C) | 0.7 in(17 mm) | 36% | 5.5 |
| AprApril | 87°F(31°C) | 51°F(11°C) | 0.3 in(7 mm) | 25% | 6.8 |
| MayMay | 96°F(36°C) | 60°F(16°C) | 0.1 in(3 mm) | 21% | 7.6 |
| JunJune | 105°F(41°C) | 69°F(20°C) | 0.1 in(2 mm) | 21% | 7.9 |
| JulJuly | 107°F(42°C) | 77°F(25°C) | 1.1 in(28 mm) | 31% | 6.9 |
| AugAugust | 106°F(41°C) | 76°F(25°C) | 1.1 in(28 mm) | 34% | 6.3 |
| SepSeptember | 101°F(38°C) | 70°F(21°C) | 0.6 in(16 mm) | 34% | 5.7 |
| OctOctober | 91°F(33°C) | 57°F(14°C) | 0.7 in(17 mm) | 28% | 4.8 |
| NovNovemberBest | 79°F(26°C) | 45°F(7°C) | 0.6 in(14 mm) | 32% | 3.6 |
| DecDecember | 68°F(20°C) | 38°F(3°C) | 0.9 in(23 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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