Expand
Contents
- The climate of San Luis
- The best time to visit San Luis
- The worst time to visit San Luis
- Spring weather in San Luis
- Summer weather in San Luis
- Autumn weather in San Luis
- Winter weather in San Luis
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of San Luis
Located in the state of Arizona, USA, the city of San Luis adheres to a subtropical desert climate. This is scientifically classified as BWh based on the Köppen climate classification. It is known for its extremely dry weather and high temperature variations throughout the year.
Interestingly, San Luis experiences negligible rainfall throughout the year. The highest average rainfall of 0.39" (10mm) can be anticipated in July. The annual average rainfall ranges from a meager 0.04" (1mm) in June to a relatively high 0.39" (10mm) in July. In contrast to other regions, the city's frequency of rainfall days substantially increases from 0.3 days in May to 5.1 days in July. Rainfall patterns in San Luis are quite unconventional, providing a unique character to its weather.
Being a desert city, San Luis endures exceptionally high temperatures. The monthly average high temperatures spike from 69.3°F (20.7°C) in January to 106.2°F (41.2°C) in July. Simultaneously, San Luis experiences a growth in average low temperatures, reaching from 51.1°F (10.6°C) in January to 84.9°F (29.4°C) in July. Quite notable is the steady increase of humidity during high temperature months, peaking at 38% in December from 23% in June.
Observations indicate that sunlight and UV radiation are abundant in San Luis. From December to June, the city experiences an increase from 7.1 hours to 12.1 hours of daily sunshine. This coincides with an escalation in daylight hours from 10 hours in December to 14.3 hours in June. Visitors should take note of the UV index, which remains between 4 in December and 8 from June to September.
Interestingly, San Luis experiences negligible rainfall throughout the year. The highest average rainfall of 0.39" (10mm) can be anticipated in July. The annual average rainfall ranges from a meager 0.04" (1mm) in June to a relatively high 0.39" (10mm) in July. In contrast to other regions, the city's frequency of rainfall days substantially increases from 0.3 days in May to 5.1 days in July. Rainfall patterns in San Luis are quite unconventional, providing a unique character to its weather.
Being a desert city, San Luis endures exceptionally high temperatures. The monthly average high temperatures spike from 69.3°F (20.7°C) in January to 106.2°F (41.2°C) in July. Simultaneously, San Luis experiences a growth in average low temperatures, reaching from 51.1°F (10.6°C) in January to 84.9°F (29.4°C) in July. Quite notable is the steady increase of humidity during high temperature months, peaking at 38% in December from 23% in June.
Observations indicate that sunlight and UV radiation are abundant in San Luis. From December to June, the city experiences an increase from 7.1 hours to 12.1 hours of daily sunshine. This coincides with an escalation in daylight hours from 10 hours in December to 14.3 hours in June. Visitors should take note of the UV index, which remains between 4 in December and 8 from June to September.
The best time to visit San Luis
The cooler months between November and February serve as the best time to visit San Luis. Temperatures during this period exhibit averages between 67.1°F (19.5°C) to 72.9°F (22.7°C) for high temperatures and 50.5°F (10.3°C) to 53.2°F (11.8°C) for low temperatures. With optimal conditions for outdoor activities and exploration, these months offer mild, comfortable weather and abundant daylight hours varying from 10 hours to 11.1 hours. The UV index falls to a moderate 4 to 5, making outdoor activities less harmful in terms of UV exposure.
The worst time to visit San Luis
The months from June to September prove to be extremely challenging for visitors due to intense high temperatures fluctuating from 102.7°F (39.3°C) to 106.2°F (41.2°C). Although the city experiences an increase in daylight hours, reaching 14.3 hours in June, and admirable sunshine hours of around 12.1 hours from June to August, the scorching heat often enhances discomforting conditions. During these months, the UV index also spikes to an extreme 8, highlighting the need for effective sun protection.
Spring weather in San Luis
Spring in San Luis falls between March and May. Average high temperatures during these months steadily rise from 80.2°F (26.8°C) to 92.8°F (33.8°C) while the average low temperatures climb from 58.3°F (14.6°C) to 68.7°F (20.4°C). Despite the climbing temperatures, this season records the lowest average rainfall of 0.08" (2mm) in April. Daylight hours expand from 12 hours in March to 13.8 hours in May, providing ample brightness for various activities.
Summer weather in San Luis
Summer in San Luis showcases the city’s extreme dessert climate, lasting from June to August. These months experience scorching high temperatures, ascending to 102.7°F (39.3°C) in June and reaching a peak of 106.2°F (41.2°C) in July. A similar trend follows in the low temperatures, seeing a rise from 77°F (25°C) in June to 86.2°F (30.1°C) in August. Despite the heat, this period receives the highest average rainfall of 0.39" (10mm) in July.
Autumn weather in San Luis
Autumn, ranging from September to November, witnesses a decline in temperatures, with highs decreasing from 99.7°F (37.6°C) in September to 77.2°F (25.1°C) in November. A decline from 80.6°F (27°C) to 59°F (15°C) can be observed in the average low temperatures during these months. Average rainfall drops to 0.16" (4mm) in October making autumn the second driest season in San Luis.
Winter weather in San Luis
Winter, occurring between December and February, reveals milder climatic conditions with high temperatures reducing to 67.1°F (19.5°C) in December from 72.9°F (22.7°C) in February. Average low temperatures decrease from 53.2°F (11.8°C) in February to 50.5°F (10.3°C) in December. December experiences an average rainfall of 0.24" (6mm) and registers the highest relative humidity of 38%, providing a slight oasis amid the typically dry weather.
Weather in January
San Luis, Arizona greets the New Year with a cool wave as January experiences one of the lowest average high temperatures of the year with 69.3°F (20.7°C). Though the weather is cold compared to the coming months, sunny skies make it pleasant. Weather in January »
Weather in February
When it comes to February weather, San Luis, Arizona sees a slight rise in temperatures compared to January. As days get longer, anticipating the arrival of spring becomes a key aspect of February's weather narrative. Frequent sun exposure accents the warming trend, making it a great time for outdoor activities. Weather in February »
Weather in March
March brings the arrival of spring to San Luis, Arizona, resulting in a significant increase in temperatures from 72.9°F (22.7°C) to 80.2°F (26.8°C). This marks a transition from cooler months to a warmer season. The lengthening days accompanied by a higher UV index indicate that sun protection becomes essential during this time. Weather in March »
Weather in April
April in San Luis, Arizona witnesses a steady rise in temperature, marking the gradual transition from spring towards the hot summer season. As temperatures edge upward, the city bathes in more daylight hours and an increased UV index. Weather in April »
Weather in May
With a dramatic increase in temperatures peaking at 92.8°F (33.8°C), May in San Luis, Arizona manifests the onset of summer. As the month progresses, daylight hours extend, allowing more time for outdoor activities despite the climbing heat. Weather in May »
Weather in June
June in San Luis, Arizona endures the highest temperatures of the year, peaking at a sweltering 102.7°F (39.3°C) - the beginning of a particularly hot, arid period. With increasing heat, the town depicts a typical desert-like climate that often gets mistaken for being inhabitable. Weather in June »
Weather in July
July in San Luis maintains a similar narrative to June, with temperatures peaking at their highest of 106.2°F (41.2°C), symbolizing the pinnacle of the summer season. The heat, combined with extended sunshine hours and minimal rainfall, cultivates an arid ambiance across the city. Weather in July »
Weather in August
August in San Luis, Arizona experiences a minor respite from the heat wave of July, with temperatures slightly cooling down. Although the weather remains quite hot, the city starts to witness a downward trend in temperatures. Combined with decreased hours of sunshine and a modest increase in rainfall, climatic patterns hint at the forthcoming transition into fall. Weather in August »
Weather in September
September in San Luis, Arizona sees temperatures easing from summer's peak to slightly cooler digits. With limited rainfall and a comparatively low relative humidity, the city maintains an arid environment. Changes in temperature point towards the onset of the fall season. Weather in September »
Weather in October
October in San Luis, Arizona heralds a pronounced decrease in high temperatures from 99.7°F (37.6°C) to 88.5°F (31.4°C), indicating the onset of the fall season. As the heat from the summer sun ebbs away, days become more manageable and nights cooler. Weather in October »
Weather in November
November in San Luis, Arizona experiences further temperature drops, preparing the city for winter. Though daytime temperatures remain fairly comfortable, the nights begin to cool off significantly. The declining temperatures and shorter days signal the transition to the cooler months. Weather in November »
Weather in December
December in San Luis, Arizona marks the end of the year with the one of the lowest average high temperatures at 67.1°F (19.5°C); a drastic shift from the sweltering summer heat. Shifting wind patterns and reduced daylight hours complement these decreased temperatures. Weather in December »
Updated: Aug 9, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How many days does it rain?
In San Luis, during the entire year, the rain falls for 25 days and collects up to 2.24" (57mm) of precipitation.
What is the driest month?
The only month without rainfall is May.
What is the least humid month?
With an average relative humidity of 23%, June is the least humid month.
When does it rain?
Months with rainfall are January through April, June through December.
When are the longest days?
June has the longest days of the year, with an average of 14h and 18min of daylight.
What is the month with the most sunshine?
The months with the most sunshine in San Luis are June and July, with an average of 12.1h of sunshine.
What are the months with the highest UV index?
The months with the highest UV index are June through September, with an average maximum UV index of 8.
What part of the year is the hottest?
With its average high temperature of 106.2°F (41.2°C) and a low of 84.9°F (29.4°C), July is regarded as the warmest month.
What is the wettest month?
July is the month with the most rainfall. Rain falls for 5.1 days and accumulates 0.39" (10mm) of precipitation.
What part of the year is the coldest?
The coldest temperatures occur during December, when averages reach a peak of 67.1°F (19.5°C) and a low of 50.5°F (10.3°C).
What is the most humid month?
With an average relative humidity of 38%, December is the most humid month.
What is the month with the shortest days?
With an average of 10h and 6min of daylight, December has the shortest days of the year.
Is there Daylight Saving Time (DST)?
San Luis does not observe Daylight Saving Time (DST). MST timezone is used over the entire year.
What is the month with the least sunshine?
With an average of 7.1h of sunshine, December has the least sunshine of the year.
When is the lowest UV index?
December is the month with the lowest UV index in San Luis, with an average maximum UV index of 4.
Average temperature
San Luis, AZ
The warmest month (with the highest average high temperature) is July (106.2°F).
The month with the lowest average high temperature is December (67.1°F).
The month with the highest average low temperature is August (86.2°F).
The coldest month (with the lowest average low temperature) is December (50.5°F).
Average pressure
San Luis, AZ
- Average pressure in January:
30.07"Hg - Average pressure in February:
30"Hg - Average pressure in March:
29.95"Hg - Average pressure in April:
29.87"Hg - Average pressure in May:
29.81"Hg - Average pressure in June:
29.75"Hg
- Average pressure in July:
29.79"Hg - Average pressure in August:
29.78"Hg - Average pressure in September:
29.79"Hg - Average pressure in October:
29.86"Hg - Average pressure in November:
29.98"Hg - Average pressure in December:
30.04"Hg
The month with the highest atmospheric pressure is January (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.75"Hg).
Average wind speed
San Luis, AZ
- Average wind speed in January:
7.1mph - Average wind speed in February:
6.8mph - Average wind speed in March:
7.3mph - Average wind speed in April:
8.3mph - Average wind speed in May:
8mph - Average wind speed in June:
7.8mph
- Average wind speed in July:
8.5mph - Average wind speed in August:
7.8mph - Average wind speed in September:
6.9mph - Average wind speed in October:
7mph - Average wind speed in November:
6.7mph - Average wind speed in December:
7.1mph
The windiest month (with the highest average wind speed) is July (8.5mph).
The calmest month (with the lowest average wind speed) is November (6.7mph).
Average humidity
San Luis, AZ
The month with the highest relative humidity is December (38%).
The month with the lowest relative humidity is June (23%).
Average rainfall
San Luis, AZ
- Average rainfall in January:
0.16" - Average rainfall in February:
0.28" - Average rainfall in March:
0.31" - Average rainfall in April:
0.08" - Average rainfall in May:
0" - Average rainfall in June:
0.04"
- Average rainfall in July:
0.39" - Average rainfall in August:
0.24" - Average rainfall in September:
0.24" - Average rainfall in October:
0.16" - Average rainfall in November:
0.12" - Average rainfall in December:
0.24"
The wettest month (with the highest rainfall) is July (0.39").
The driest month (with the least rainfall) is May (0").
Average rainfall days
San Luis, AZ
- Average rainfall days in January:
2 days - Average rainfall days in February:
2.1 days - Average rainfall days in March:
1.7 days - Average rainfall days in April:
1.5 days - Average rainfall days in May:
0.3 days - Average rainfall days in June:
0.8 days
- Average rainfall days in July:
5.1 days - Average rainfall days in August:
3.5 days - Average rainfall days in September:
3.3 days - Average rainfall days in October:
1.2 days - Average rainfall days in November:
1.5 days - Average rainfall days in December:
2 days
The month with the highest number of rainy days is July (5.1 days).
The month with the least rainy days is May (0.3 days).
Average daylight / Average sunshine
San Luis, AZ
- Average daylight in January:
10h and 2min - Average daylight in February:
11h and 1min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 0min - Average daylight in May:
13h and 5min - Average daylight in June:
14h and 2min
- Average daylight in July:
14h and 0min - Average daylight in August:
13h and 2min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 2min - Average daylight in November:
10h and 3min - Average daylight in December:
10h and 1min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 6min).
- Average sunshine in January:
8h and 0min - Average sunshine in February:
9h and 3min - Average sunshine in March:
9h and 2min - Average sunshine in April:
10h and 1min - Average sunshine in May:
12h and 0min - Average sunshine in June:
12h and 1min
- Average sunshine in July:
12h and 1min - Average sunshine in August:
10h and 4min - Average sunshine in September:
9h and 5min - Average sunshine in October:
8h and 5min - Average sunshine in November:
7h and 2min - Average sunshine in December:
7h and 1min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 7h and 6min).
Average sunshine days
San Luis, AZ
- Average sunshine days in January:
28.8 days - Average sunshine days in February:
26 days - Average sunshine days in March:
29.3 days - Average sunshine days in April:
28.4 days - Average sunshine days in May:
30.4 days - Average sunshine days in June:
29.3 days
- Average sunshine days in July:
24.3 days - Average sunshine days in August:
25.7 days - Average sunshine days in September:
26.1 days - Average sunshine days in October:
29.5 days - Average sunshine days in November:
28.3 days - Average sunshine days in December:
28.7 days
The month with the most sunshine days is May (30.4 days).
The month with the least sunshine days is July (24.3 days).
Average UV index
San Luis, AZ
The months with the highest UV index are June, July, August and September (UV index 8).
The month with the lowest UV index is December (UV index 4).
Average cloud cover
San Luis, AZ
The month with the most cloud cover is December (Cloud cover 18).
The month with the least cloud cover is June (Cloud cover 5).
Average visibility
San Luis, AZ
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
San Luis, Arizona, USA
Weather forecast for your location
1. Click Locate me button
2. Allow the app to use your location
2. Allow the app to use your location