Yearly & Monthly weather - Sierra Vista, AZ

The climate of Sierra Vista
The best time to visit Sierra Vista
The worst time to visit Sierra Vista
Spring weather in Sierra Vista
Summer weather in Sierra Vista
Autumn weather in Sierra Vista
Winter weather in Sierra Vista
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 snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

The vast Sierra Vista region of Arizona

The climate of Sierra Vista

Sierra Vista, Arizona finds itself in the mid-latitude steppe climate as per the Köppen Climate Classification. This implies that the region endures a semi-arid environment with warm temperatures and limited annual rainfall. The geographic location nestles in between the Huachuca Mountains and the San Pedro River, which significantly influences the weather patterns.

Observing the annual climate, the monthly average temperatures fluctuate between 37.8°F (3.2°C) and 90.1°F (32.3°C). Sierra Vista basks in peak temperatures from May to September, with the mercury hitting the 80°F (26.7°C) mark and sometimes soaring up to 90°F (32.2°C). The winter months from December to February still hold a mild charm with the daytime temperatures hovering around 56.5°F (13.6°C) to 59.7°F (15.4°C). Yet, winter nights can become chilly as the temperatures drop to a gentle 37.8°F (3.2°C).

Annual rainfall ranges from 0.12" (3mm) in May to a substantial 4.53" (115mm) in July. Weather tipping towards drier months can be observed from March to May with moisture levels plunging as low as 23% relative humidity. While rainfall occurs throughout the year, the most precipitous period descends from July to September, contributing to half of the annual rainfall.

The monsoon season in Sierra Vista comes with dramatic weather variations. The city receives most of its rainfall, peaking in July and August. This sudden surge in humidity from 23% in June to 47% in July corresponds with the Southwest Monsoon season. Wind speeds generally range between 5.5mph (8.9km/h) and 9.8mph (15.8km/h), with gusts reaching up to 13.9mph (22.4km/h) in April. Additionally, visibility remains consistent at 6 miles throughout the year.

The best time to visit Sierra Vista

From a tourist's perspective, the best time to visit Sierra Vista would be during the late spring and early fall months, particularly from April to June and from September to November. During these periods, ample sunshine lights up for about 11.1 hours to 13.8 hours daily, along with moderate temperatures ranging from 73.2°F (22.9°C) to 81.7°F (27.6°C) in the day and cool evenings dropping to between 49.1°F (9.5°C) and 64.9°F (18.3°C). These months also experience minimal rainfall, lowering the chances of weather-related disruptions to outdoor activities.

The worst time to visit Sierra Vista

Visitors might find the summer months from July to August least desirable due to the high temperatures touching the 86.5°F (30.3°C) mark and the humidity levels rising to 49%, making it uncomfortably warm. It is also during these months that Sierra Vista undergoes its most intense monsoon phase, leading to high rainfall. Inclement weather conditions during this period might put a damper on outdoor plans.

Spring weather in Sierra Vista

Spring in Sierra Vista is characterized by mild and comfortable temperatures ranging from 37.8°F (3.2°C) to 73.2°F (22.9°C). Rainfall during this period stays fairly low, showing a decrease from 0.67" (17mm) in February to 0.12" (3mm) in May. The weather gradually warms up over these months, marking the transition to the hotter summer months. Significant sunlight period can span from 12 hours in March to peak at 13.8 hours in May, making spring an excellent time for outdoor activities.

Summer weather in Sierra Vista

Summer weather in Sierra Vista is considerably hot and humid. Daytime temperatures can heat up from 80.1°F (26.7°C) to a sizzling 90.1°F (32.3°C) between June and August. These months also mark the peak of the annual monsoon season which results in a sharp increase in rainfall, reaching heights of 4.53" (115mm) in July. Humidity also sees an upward trend, setting into motion a pattern of afternoon rain showers and thunderstorms.

Autumn weather in Sierra Vista

Autumn in Sierra Vista sees a much-needed reprieve from the monsoon season with falling humidity levels from 50% in September to 41% in October and subsequent decrease in rainfall. Daytime temperatures start to sink gradually from 81.7°F (27.6°C) in September to a cool 65.5°F (18.6°C) in November, while nighttime temperatures can dip to between 54.1°F (12.3°C) to 45°F (7.2°C). Thus, the season generally offers pleasant temperatures and lesser rainfall.

Winter weather in Sierra Vista

Winters in Sierra Vista bear witness to mild and cool weather conditions. Daytime temperatures vary from 65.5°F (18.6°C) in December to a cooler 56.5°F (13.6°C) in February, while nightly temperatures during these colder months range from 45°F (7.2°C) to 37.8°F (3.2°C). Rainfall parameters remain below an inch throughout, and snowfall observed in December and January is minimal, adding to an overall mild winter experience.

Weather in January

January serves as the start of the year in Sierra Vista, Arizona, USA, bringing temperate conditions. Visitors can expect a cooler climate during dawn and dusk with evening temperatures dropping down to 37.8°F (3.2°C), presenting an ideal atmosphere for outdoor activities. Weather in January »

Weather in February

The transition from January to February in Sierra Vista sees an uptick in both daily high and low temperatures. With an average high of 59.7°F (15.4°C), the days are warm but not excessively so. Visitors will notice an increase in sunshine hours, providing additional daylight for activities. Weather in February »

Weather in March

In March, the city of Sierra Vista begins to hint at the spring season. The change from February is marked by a decrease in humidity, resulting in slightly drier conditions. Travelers will appreciate the comfortable daytime temperatures and the extended sunshine hours. Weather in March »

Weather in April

As Sierra Vista moves deeper into spring with the arrival of April, the days begin to warm up noticeably. Variances between March and April become more pronounced, primarily through the increase in temperature and the drop in rain frequency. Weather in April »

Weather in May

The transition from April to May in Sierra Vista is characterized by a considerable uptick in temperatures. The city gets significantly warmer with the average high temperature reaching 80.1°F (26.7°C), a clear indication of the impending summer. Weather in May »

Weather in June

June brings the onset of summer in Sierra Vista, with temperatures soaring to seasonal highs. The city experiences the warmest weather during this month, with average highs close to 90.1°F (32.3°C). Despite the climb in temperature, humidity remains relatively low, ensuring manageable conditions. Weather in June »

Weather in July

July perpetuates the trend of high temperatures in Sierra Vista, although with an interesting twist. While the city remains hot during the day, rainfall frequency significantly ramps up. Hitting an average rainfall of 4.53" (115mm), a stark contrast to previous months, July is considered the wettest month of the year. Weather in July »

Weather in August

Moving into August, Sierra Vista maintains its tendency for rainy summers. While temperatures remain high, similar to July around 86.5°F (30.3°C), it is the average rainfall of 4.06" (103mm) that sets August apart. Sierra Vista continues to experience regular rain showers, providing much-needed relief from the higher temperatures. Weather in August »

Weather in September

September marks the beginning of a gradual decrease in both temperatures and rainfall. While the temperature drops slightly, the city receives significantly less rainfall compared to the preceding months, with an average precipitation of 2.32" (59mm). Weather in September »

Weather in October

The transition into October offers a welcome respite from the summer heat in Sierra Vista. Temperatures continue to trend downward, and the city becomes noticeably cooler, particularly during the evenings. Tourists can expect crisp and refreshing mornings, followed by warm afternoons, creating pleasing contrasts. Weather in October »

Weather in November

November witnesses a significant drop in temperatures in Sierra Vista, signaling the onset of the winter season. The city starts to cool down rapidly, necessitating warm clothing, particularly after sunset. Comparatively fewer daylight hours further accentuate the sense of winter, with the sun setting early in the evening. Weather in November »

Weather in December

December in Sierra Vista is characterized by the chills of winter. The city faces its coldest month, with temperatures dropping down to a daily average low of 37.8°F (3.2°C). Snow showers happen occasionally, usually amounting to an average snowfall of 1.22" (31mm), adding a picturesque winter aura to the city. Weather in December »

Updated: Jul 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How many days does it rain?

Throughout the year, in Sierra Vista, there are 92.2 rainfall days, and 15.47" (393mm) of precipitation is accumulated.

When does it snow in Sierra Vista?

January through March and December are months with snowfall.

How much does it snow?

Throughout the year, there are 3 snowfall days, and 3.27" (83mm) of snow is accumulated.

What is the month with the lowest UV index?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3.

When does it snow the most in Sierra Vista?

February is the month with the most snowfall in Sierra Vista. Snow falls for 0.6 days and accumulates 1.46" (37mm) of snow.

When it does not snow?

April through November are months without snowfall.

What is the least humid month?

The months with the lowest humidity are May and June, with an average relative humidity of 23%.

What is the driest month?

The month with the least rainfall is May, when the rain falls for 2.3 days and typically collects 0.12" (3mm) of precipitation.

What is the hottest time of year?

In Sierra Vista, Arizona, the average temperatures in June are the highest, with a peak at 90.1°F (32.3°C) and a low of 64.9°F (18.3°C).

When are the longest days?

With an average of 14h and 12min of daylight, June has the longest days of the year.

What are the months with the most sunshine?

The months with the most sunshine are June and August, with an average of 12h of sunshine.

What is the month with the highest UV index?

With an average maximum UV index of 7, June is the month with the highest UV index.

What is the rainiest month?

The month with the most rainfall is July, when the rain falls for 21.3 days and typically aggregates up to 4.53" (115mm) of precipitation.

What is the most humid month?

With an average relative humidity of 50%, September is the most humid month.

What is the coldest month?

The month of December sees the average lowest temperatures, reaching 56.5°F (13.6°C) at the peak and 37.8°F (3.2°C) at the low.

What is the month with the shortest days?

December has the shortest days of the year in Sierra Vista, with an average of 10h and 6min of daylight.

Is there Daylight Saving Time (DST)?

Sierra Vista does not observe Daylight Saving Time (DST). MST timezone is used over the entire year.

What is the month with the least sunshine?

December has the least sunshine of the year, with an average of 6.9h of sunshine.

Average temperature
Sierra Vista, AZ

Average high temperature in January:
57.4°F
Average high temperature in February:
59.7°F
Average high temperature in March:
67.5°F
Average high temperature in April:
73.2°F
Average high temperature in May:
80.1°F
Average high temperature in June:
90.1°F

Average high temperature in July:
86.5°F
Average high temperature in August:
86.5°F
Average high temperature in September:
81.7°F
Average high temperature in October:
75.6°F
Average high temperature in November:
65.5°F
Average high temperature in December:
56.5°F

The warmest month (with the highest average high temperature) is June (90.1°F).
The month with the lowest average high temperature is December (56.5°F).

Average low temperature in January:
37.8°F
Average low temperature in February:
39.9°F
Average low temperature in March:
45.1°F
Average low temperature in April:
49.1°F
Average low temperature in May:
54.1°F
Average low temperature in June:
64.9°F

Average low temperature in July:
69.6°F
Average low temperature in August:
68.2°F
Average low temperature in September:
63.1°F
Average low temperature in October:
54.1°F
Average low temperature in November:
45°F
Average low temperature in December:
37.8°F

The month with the highest average low temperature is July (69.6°F).
The coldest months (with the lowest average low temperature) are January and December (37.8°F).

Average pressure
Sierra Vista, AZ

The month with the highest atmospheric pressure is January (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

Average wind speed
Sierra Vista, AZ

The windiest month (with the highest average wind speed) is April (9.8mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

Average humidity
Sierra Vista, AZ

The month with the highest relative humidity is September (50%).
The months with the lowest relative humidity are May and June (23%).

Average rainfall
Sierra Vista, AZ

The wettest month (with the highest rainfall) is July (4.53").
The driest month (with the least rainfall) is May (0.12").

Average rainfall days
Sierra Vista, AZ

Average rainfall days in January:
4.8 days
Average rainfall days in February:
4 days
Average rainfall days in March:
5.1 days
Average rainfall days in April:
3.1 days
Average rainfall days in May:
2.3 days
Average rainfall days in June:
5.3 days

Average rainfall days in July:
21.3 days
Average rainfall days in August:
18.7 days
Average rainfall days in September:
12.9 days
Average rainfall days in October:
5.3 days
Average rainfall days in November:
3.7 days
Average rainfall days in December:
5.7 days

The month with the highest number of rainy days is July (21.3 days).
The month with the least rainy days is May (2.3 days).

Average snowfall
Sierra Vista, AZ

The month with the highest snowfall is February (1.46").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

Average snowfall days
Sierra Vista, AZ

Average snowfall days in January:
0.8 days
Average snowfall days in February:
0.6 days
Average snowfall days in March:
0.2 days
Average snowfall days in April:
0 days
Average snowfall days in May:
0 days
Average snowfall days in June:
0 days

Average snowfall days in July:
0 days
Average snowfall days in August:
0 days
Average snowfall days in September:
0 days
Average snowfall days in October:
0 days
Average snowfall days in November:
0.1 days
Average snowfall days in December:
1.3 days

The month with the highest number of snowfall days is December (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight / Average sunshine
Sierra Vista, 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 1min

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 4min
Average daylight in December:
10h and 1min

The month with the longest days is June (Average daylight: 14h and 12min).
The month with the shortest days is December (Average daylight: 10h and 6min).

Average sunshine in January:
7h and 1min
Average sunshine in February:
8h and 4min
Average sunshine in March:
9h and 1min
Average sunshine in April:
11h and 1min
Average sunshine in May:
11h and 5min
Average sunshine in June:
12h and 0min

Average sunshine in July:
11h and 4min
Average sunshine in August:
12h and 0min
Average sunshine in September:
9h and 5min
Average sunshine in October:
7h and 5min
Average sunshine in November:
7h and 2min
Average sunshine in December:
6h and 5min

The months with the most sunshine are June and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).

Average sunshine days
Sierra Vista, AZ

Average sunshine days in January:
25 days
Average sunshine days in February:
23.4 days
Average sunshine days in March:
25.6 days
Average sunshine days in April:
26.9 days
Average sunshine days in May:
28.1 days
Average sunshine days in June:
23.3 days

Average sunshine days in July:
6.5 days
Average sunshine days in August:
7.7 days
Average sunshine days in September:
14.4 days
Average sunshine days in October:
22.7 days
Average sunshine days in November:
25.6 days
Average sunshine days in December:
23.5 days

The month with the most sunshine days is May (28.1 days).
The month with the least sunshine days is July (6.5 days).

Average UV index
Sierra Vista, AZ

The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).

Average cloud cover
Sierra Vista, AZ

The month with the most cloud cover is July (Cloud cover 24).
The month with the least cloud cover is May (Cloud cover 8).

Average visibility
Sierra Vista, 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).

Climate and monthly weather forecastSierra Vista, AZ

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