Mesa, AZ Climate & Monthly Averages
Mesa has a semi-arid climate. July is the hottest month, averaging 106° by day; January is the coldest at 65°.
Mesa's climate runs on sunshine and sparse rain
With 11.2 inches (285 mm) of annual precipitation, Mesa is one of the drier places we cover. January is the wettest month it gets, at 1.6 inches (42 mm), and the year runs between 65°F (19°C) and 106°F (41°C) by day.
What the dry climate changes
January bottoms out at 65°F (19°C) in daylight, 43°F (6°C) after dark. At its warmest, in July, Mesa runs to 106°F (41°C) in the afternoon and back to 84°F (29°C) by dawn. Relative humidity averages 34% across the year, drier than almost anywhere else we cover.
The wettest month is January (1.6 inches (42 mm) across 5 days) and the driest May. Five of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is November through March. The gridded 2015-2024 daily record for this location tops out at 118°F (48°C) and bottoms at 26°F (-4°C) - decade extremes, not all-time station records.
More climate facts for Mesa
- Hottest month: July - highs near 106°F (41°C)
- Coldest month: January - highs near 65°F (19°C)
- Decade extremes (2015-2024): 118°F (48°C) high · 26°F (-4°C) low
- Wettest month: January (5 rainy days) · Sunniest: June (13.1 h sun/day)
- Climate type: semi-arid
- Annual swing: 23°C between the average warmest and coolest month · day to night: 13°C
- Months averaging 30°C or hotter: 7
- Average humidity: 34%
Heat, cold and scarce precipitation in the dataset
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need another precipitation unit? Use the rainfall converter.
When the dry weather is easiest to use
Avoiding the hardest heat or cold
The best time to visit Mesa is generally November to March, when temperatures sit either side of the peak heat rather than in it. Daytime temperatures in that window sit near 71°F (22°C), with rain on about 4 days a month. For the same question asked the other way round, see where else is warm in November.
Prepare for sun and cooler nights
Pack for Mesa with lightweight, breathable clothing and serious sun protection. July nights average 84°F (29°C), so evenings rarely match the afternoons.
Monthly heat and rainfall table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 65° | 43° | 5 | 1.6 in | 8.5 h/day | 10.2 h | 17% | 54% |
| February | 70° | 46° | 4 | 1.2 in | 9.6 h/day | 10.9 h | 13% | 46% |
| March | 77° | 51° | 4 | 1.0 in | 10.6 h/day | 11.9 h | 12% | 37% |
| April | 87° | 59° | 1 | 0.2 in | 12.5 h/day | 13.0 h | 4% | 22% |
| May | 93° | 67° | 1 | 0.1 in | 12.9 h/day | 13.9 h | 3% | 19% |
| June | 105° | 78° | 1 | 0.2 in | 13.1 h/day | 14.4 h | 3% | 17% |
| July | 106° | 84° | 5 | 1.6 in | 12.1 h/day | 14.2 h | 15% | 31% |
| August | 104° | 82° | 6 | 1.4 in | 12.1 h/day | 13.4 h | 18% | 35% |
| September | 100° | 76° | 3 | 0.9 in | 11.4 h/day | 12.3 h | 9% | 32% |
| October | 89° | 64° | 2 | 0.9 in | 10.5 h/day | 11.3 h | 8% | 32% |
| November | 76° | 53° | 2 | 0.7 in | 9.4 h/day | 10.4 h | 6% | 36% |
| December | 67° | 45° | 4 | 1.3 in | 8.2 h/day | 9.9 h | 14% | 48% |
How daytime heat and cool nights change by month
Each card shows the average high and low. The bar places that month between Mesa's coldest night and warmest afternoon.
January
- Rain
- 5 days
- Sunshine
- 8.5 h
- Daylight
- 10.2 h
February
- Rain
- 4 days
- Sunshine
- 9.6 h
- Daylight
- 10.9 h
March
- Rain
- 4 days
- Sunshine
- 10.6 h
- Daylight
- 11.9 h
April
- Rain
- 1 day
- Sunshine
- 12.5 h
- Daylight
- 13.0 h
May
- Rain
- 1 day
- Sunshine
- 12.9 h
- Daylight
- 13.9 h
June
- Rain
- 1 day
- Sunshine
- 13.1 h
- Daylight
- 14.4 h
July
- Rain
- 5 days
- Sunshine
- 12.1 h
- Daylight
- 14.2 h
August
- Rain
- 6 days
- Sunshine
- 12.1 h
- Daylight
- 13.4 h
September
- Rain
- 3 days
- Sunshine
- 11.4 h
- Daylight
- 12.3 h
October
- Rain
- 2 days
- Sunshine
- 10.5 h
- Daylight
- 11.3 h
November
- Rain
- 2 days
- Sunshine
- 9.4 h
- Daylight
- 10.4 h
December
- Rain
- 4 days
- Sunshine
- 8.2 h
- Daylight
- 9.9 h
Looking for warmer alternatives? Browse warm places by month, or compare Mesa's coolest part of the year: January, December, February.
Heat and cold across the Mesa year
Spring (March through May)
Spring is hot here - highs near 85°F (30°C), nights near 59°F (15°C), and precipitation is sparse, near 1.4 inches (35 mm) for the season. Daylight is generous - around 12.0 hours of sun a day.
Summer (June through August)
Through summer, Mesa turns very hot: 105°F (40°C) by day, 81°F (27°C) after dark, and rain comes on about 11 days over the three months. Daylight is generous - around 12.4 hours of sun a day.
Fall (September through November)
Fall is hot here - highs near 88°F (31°C), nights near 64°F (18°C), and precipitation is sparse, near 2.6 inches (65 mm) for the season. Daylight is generous - around 10.4 hours of sun a day.
Winter (December through February)
Winter stays on the cool side of mild here - highs near 67°F (20°C), nights near 45°F (7°C), and rain comes on about 13 days over the three months.
How unusual is Mesa?
- Afternoons run 13°C above the following night - a bigger day-to-night gap than 97% of the 3496 cities we track.
- Rain or snow reaches the ground on 37 days a year - fewer wet days than all but 5% of the 3496 cities we track.
- Annual precipitation is 11.2 inches (285 mm) - drier than all but 7% of the 3496 cities we track.
These comparisons use the same ten-year window for every city in the dataset.