San Luis Río Colorado climate
San Luis Río Colorado (Sonora, Mexico) has a hot desert climate (Köppen BWh). The average temperature over the year is 24 °C74 °F, and about 84 mm3.3 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
San Luis Río Colorado climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 2068 | 642 | 1355 | 120.5 | 1 |
| Feb | 2272 | 745 | 1559 | 110.4 | 0 |
| Mar | 2781 | 1050 | 1965 | 80.3 | 0 |
| Apr | 3188 | 1355 | 2272 | 30.1 | 0 |
| May | 3697 | 1762 | 2679 | 20.1 | 0 |
| Jun | 41107 | 2171 | 3189 | 00.0 | 0 |
| Jul | 43110 | 2780 | 3595 | 70.3 | 0 |
| Aug | 43109 | 2780 | 3594 | 80.3 | 0 |
| Sep | 40103 | 2374 | 3189 | 110.4 | 0 |
| Oct | 3391 | 1762 | 2576 | 50.2 | 0 |
| Nov | 2678 | 1151 | 1865 | 80.3 | 0 |
| Dec | 1967 | 642 | 1254 | 100.4 | 1 |
| Year | 43110 | 642 | 2474 | 843.3 | 2 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 45% | 39% | 3.6 | 10:14 |
| Feb | 43% | 41% | 4.6 | 10:59 |
| Mar | 39% | 37% | 6.0 | 11:54 |
| Apr | 32% | 31% | 7.4 | 12:56 |
| May | 29% | 28% | 8.2 | 13:48 |
| Jun | 25% | 25% | 8.4 | 14:16 |
| Jul | 31% | 35% | 7.7 | 14:05 |
| Aug | 33% | 32% | 7.2 | 13:20 |
| Sep | 31% | 28% | 6.3 | 12:19 |
| Oct | 32% | 29% | 5.1 | 11:19 |
| Nov | 35% | 34% | 3.9 | 10:27 |
| Dec | 45% | 39% | 3.3 | 10:02 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of San Luis Río Colorado is like
The warmest month is July, with an average high of 43 °C110 °F and a low of 27 °C80 °F. The coldest is December, when highs average 19 °C67 °F and lows 6 °C42 °F. Seasons are strongly marked: the warmest month is on average 22.4 °C40.4 °F warmer than the coldest.
It is very dry, with only 84 mm3.3 in of precipitation in an average year. The wettest three-month stretch is December–February, which brings 39% of the annual total. The wettest month is January (12 mm0.5 in), the driest is June (0 mm0.0 in).
Relative humidity ranges from 25% in June to 45% in December. The clearest skies (lowest average cloud amount, 25%) are typical of June. Average wind speed near the ground ranges from 6 km/h (4 mph) in November to 8 km/h (5 mph) in July. Daylight lasts from about 10.0 hours in December to 14.3 hours in June.
Best time to visit San Luis Río Colorado
Based on these averages, the most comfortable months for sightseeing and outdoor activities are November–March: average highs of 19 °C67 °F to 27 °C81 °F with 8 mm0.3 in to 12 mm0.5 in of precipitation per month.
The most challenging month is July, which is hot, with average highs of 43 °C110 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for San Luis Río Colorado
- Winter (December–February) — highs 1967 to 22 °C72 °F, lows 642 to 7 °C45 °F, about 11 mm0.4 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
- Spring (March–May) — highs 2781 to 36 °C97 °F, lows 1050 to 17 °C62 °F, about 4 mm0.2 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water and an extra layer for the cooler mornings and evenings.
- Summer (June–August) — highs 41107 to 43 °C110 °F, lows 2171 to 27 °C80 °F, about 5 mm0.2 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water.
- Autumn (September–November) — highs 2678 to 40 °C103 °F, lows 1151 to 23 °C74 °F, about 8 mm0.3 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water and an extra layer for the cooler mornings and evenings.
How San Luis Río Colorado compares
Compared with Mexicali, about 67 km to the west, San Luis Río Colorado is on average 0.9 °C1.6 °F cooler and receives 33% less precipitation (84 mm3.3 in vs 126 mm5.0 in). The difference is largest in December (1.3 °C2.3 °F cooler).
Of the 96 places in Mexico covered by World Climates, San Luis Río Colorado is the 44th warmest by annual mean temperature and the 96th wettest by annual precipitation. See all of them on the Mexico climate page.
Places in other countries with the most similar temperature and rainfall pattern: Yuma (United States, BWh), Peoria (United States, BWh) and Ouargla (Algeria, BWh).
Nearby places
- Yuma 33 km · 23 °C74 °F · 99 mm3.9 in
- Mexicali 67 km · 24 °C76 °F · 126 mm5.0 in
- Ensenada 184 km · 19 °C66 °F · 255 mm10 in
- El Cajon 209 km · 20 °C68 °F · 320 mm13 in
- Tijuana 210 km · 19 °C66 °F · 269 mm11 in
- San Diego 226 km · 19 °C67 °F · 269 mm11 in
- Escondido 229 km · 20 °C67 °F · 320 mm13 in
- Temecula 250 km · 20 °C68 °F · 299 mm12 in
Frequently asked questions
What is the warmest month in San Luis Río Colorado?
July is the warmest month in San Luis Río Colorado, with an average high of 43 °C (110 °F) and an average low of 27 °C (80 °F).
What is the coldest month in San Luis Río Colorado?
December is the coldest month, with an average high of 19 °C (67 °F) and an average low of 6 °C (42 °F).
When does it rain the most in San Luis Río Colorado?
January is the wettest month with about 12 mm (0.5 in) of precipitation; June is the driest with about 0 mm (0.0 in).
What is the best time to visit San Luis Río Colorado?
Judging by long-term averages, the most comfortable months are November–March.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.