San Luis, Arizona Climate by Month
San Luis, Arizona, United States
Very hot summers and mild winters, with almost no rain.
The climate in San Luis is one of very hot summers and mild winters, with almost no rain. July is the warmest month, with highs around 107°F (42°C); December is the coolest at 70°F (21°C), and nights dip to 43°F (6°C). It gets only 2.9 in (73 mm) of rain a year. September to July are almost completely dry. The air is dry, averaging 38% relative humidity.
- Warmest month
- 107°F(42°C)
- Average high, July
- Coldest nights
- 43°F(6°C)
- Average low, December
- Rain per year
- 2.9 in(73 mm)
- No clear rainy season
- Humidity
- 38%
- Sunniest: June
Best and worst months in San Luis
Best for weatherThe most comfortable weather comes in February, with highs around 75°F (24°C) and almost no rain.
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)
San Luis weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 71°F(21°C) | 44°F(7°C) | 0.4 in(9 mm) | 44% | 3.2 |
| FebFebruaryBest | 75°F(24°C) | 46°F(8°C) | 0.4 in(9 mm) | 45% | 4.0 |
| MarMarch | 82°F(28°C) | 50°F(10°C) | 0.3 in(8 mm) | 41% | 5.4 |
| AprApril | 89°F(31°C) | 55°F(13°C) | 0.1 in(2 mm) | 34% | 6.5 |
| MayMay | 97°F(36°C) | 63°F(17°C) | 0.0 in(1 mm) | 31% | 7.3 |
| JunJune | 105°F(41°C) | 71°F(21°C) | 0.0 in(1 mm) | 29% | 7.6 |
| JulJuly | 107°F(42°C) | 77°F(25°C) | 0.2 in(4 mm) | 35% | 7.1 |
| AugAugust | 106°F(41°C) | 78°F(26°C) | 0.4 in(10 mm) | 39% | 6.6 |
| SepSeptember | 102°F(39°C) | 73°F(23°C) | 0.4 in(9 mm) | 36% | 5.7 |
| OctOctober | 92°F(33°C) | 61°F(16°C) | 0.3 in(7 mm) | 35% | 4.8 |
| NovNovember | 80°F(27°C) | 50°F(10°C) | 0.2 in(4 mm) | 38% | 3.6 |
| DecDecember | 70°F(21°C) | 43°F(6°C) | 0.4 in(9 mm) | 45% | 3.0 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
Places with a similar climate outside the United States
- 🇲🇽Santa IsabelBaja California, Mexico · Pop. 29k96%matchMore humidSan Luis vs Santa Isabel →
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- 🇵🇰WashukBalochistan, Pakistan · Pop. 41k73%matchLess humidSan Luis vs Washuk →
- 🇲🇦ArfoudDrâa-Tafilalet, Morocco · Pop. 32k72%matchColder wintersLess humidSan Luis vs Arfoud →
- 🇲🇦ZagoraDrâa-Tafilalet, Morocco · Pop. 44k71%matchLess humidSan Luis vs Zagora →
- 🇺🇸El CentroCalifornia, United States · Pop. 44k99%matchClose on every measureSan Luis vs El Centro →
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- 🇺🇸AvondaleArizona, United States · Pop. 81k87%matchWetter summersColder wintersSan Luis vs Avondale →
- 🇺🇸Casa GrandeArizona, United States · Pop. 51k78%matchWetter summersColder wintersSan Luis vs Casa Grande →
- 🇺🇸MesaArizona, United States · Pop. 472k76%matchWetter summersLess humidSan Luis vs Mesa →