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South Tucson climate
Typical historical weather for South Tucson, United States, averaged across 10 years of hourly climate data. Pick a date for a specific day.
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Annual average
21.7°C
across all months
Warmest month
37.3°C
Jun average high
Coolest month
5°C
Jan average low
Annual rainfall
247mm
total per year
South Tucson is typically hottest in June and coolest in January, a swing of about 32.3°C across the year. About 44% of annual rainfall falls in the three wettest months (July is typically wettest, April driest).
Monthly averages
Average daily high/low temperature (band) and monthly rainfall (bars).
| Month | Avg high | Avg low | Rainfall | Wet days | Humidity | Wind | Cloud | Solar |
|---|---|---|---|---|---|---|---|---|
| Jan | 17.5°C · record 22.2–27°C | 5°C · record -2.1–0.6°C | 29mm | 4 | 48% | 2.5 m/s | 35% | 3.7 kWh/m² |
| Feb | 19.7°C · record 23.1–30.3°C | 6.7°C · record -2.7–3.4°C | 29mm | 4 | 40% | 2.7 m/s | 34% | 4.7 kWh/m² |
| Mar | 22.9°C · record 26.6–33.5°C | 9.6°C · record 0.3–6.1°C | 17mm | 4 | 34% | 2.9 m/s | 34% | 6.1 kWh/m² |
| Apr | 27.9°C · record 32.9–36.7°C | 13.4°C · record 1.9–9.6°C | 3mm | 1 | 22% | 3.1 m/s | 21% | 7.7 kWh/m² |
| May | 31.7°C · record 34.5–39.8°C | 17.3°C · record 8.7–14.1°C | 3mm | 1 | 20% | 3.1 m/s | 16% | 8.3 kWh/m² |
| Jun | 37.3°C · record 40.4–44.7°C | 23.2°C · record 15.4–20.3°C | 9mm | 1 | 21% | 2.9 m/s | 21% | 8.2 kWh/m² |
| Jul | 37.1°C · record 40–43.1°C | 26°C · record 20.3–23.9°C | 43mm | 9 | 39% | 2.5 m/s | 48% | 7.2 kWh/m² |
| Aug | 36°C · record 38–43.2°C | 25.3°C · record 20.3–23.5°C | 37mm | 9 | 42% | 2.2 m/s | 44% | 6.7 kWh/m² |
| Sep | 34.3°C · record 37.5–41.2°C | 22.4°C · record 13.1–20°C | 24mm | 4 | 38% | 2.5 m/s | 26% | 6.1 kWh/m² |
| Oct | 29.7°C · record 30.8–39.4°C | 16.3°C · record 3.6–13.3°C | 12mm | 2 | 32% | 2.5 m/s | 19% | 5.2 kWh/m² |
| Nov | 23.4°C · record 26–32.7°C | 10.4°C · record 0.3–9.5°C | 16mm | 2 | 37% | 2.5 m/s | 31% | 4 kWh/m² |
| Dec | 19.1°C · record 23.3–28.5°C | 6.7°C · record -1.6–3.7°C | 25mm | 4 | 46% | 2.4 m/s | 37% | 3.3 kWh/m² |
"Avg high"/"Avg low" is the mean daily high/low for that month, averaged across every year on file. The "record" figure alongside it is a different statistic — the single hottest (or coldest) hour ever recorded during that month across all years — so it can sit above or below the average and does not describe the average's year-to-year spread. A "wet day" is any day with at least 1.0mm of rain.
Year to year
Annual average temperature, 2016–2025.
Across these 10 years, the annual average has moved by about +0.15°C per decade. That’s a short window for a reliable long-term climate trend — treat it as indicative, not definitive.
Annual rainfall has moved by about -85.76mm per decade over the same period.
2025 (the most recent year on file) averaged 22.2505085844972°C, above the 9-year baseline of 21.63°C by 1.39 standard deviations.
Typical extremes per year
Rainy days
44 days
≥1.0mm rain
Heavy rain days
1.2 days
≥20mm rain
Extreme heat days
13.9 days
daily high ≥40°C
Frost days
3.9 days
daily low ≤0°C
Averaged across 10 years on file. Thresholds match PastClimate's data pipeline definitions — see data & sources.
Records on file
Ranked across 10 years of data currently on file (2016–2025).
Hottest day
44.7°C
19 June 2016
2016 was 0.27 SD below the 9-year average that year
Coldest day
-2.7°C
3 February 2022
2022 was 1.88 SD below the 9-year average that year
Wettest day
50.2mm
19 September 2018
2018 was 0.13 SD below the 9-year average that year
Windiest day
7.3m/s
22 February 2023
2023 was 0.05 SD above the 9-year average that year
See the detail: South Tucson on 19 September 2018.
Nearby cities
Tucson
Same ERA5 grid cell
Casas Adobes
Same ERA5 grid cell
Catalina Foothills
Same ERA5 grid cell
Drexel Heights
Same ERA5 grid cell
Flowing Wells
Same ERA5 grid cell
Tucson Estates
Same ERA5 grid cell
Want a side-by-side view instead? Compare South Tucson with another city.
Frequently asked questions about South Tucson's climate
What is the hottest month in South Tucson?
June is typically the warmest month in South Tucson, with an average high of 37.3°C. January is typically the coolest, averaging 5°C overnight.
How much does it rain in South Tucson?
South Tucson gets about 247mm of rain a year on average, with roughly 44% of it falling in the three wettest months (July is typically the wettest, April the driest).
How many extremely hot or cold days does South Tucson have?
On average, South Tucson sees about 13.9 day(s) a year at or above 40°C and about 3.9 day(s) at or below 0°C, based on 10 years of data.
Is South Tucson getting warmer?
Across the 10 years on file (2016–2025), the annual average temperature has moved by about +0.15°C per decade. That's a short window for a reliable long-term climate trend — treat it as indicative, not definitive.
What is the hottest day on record for South Tucson?
The hottest day on file is 19 June 2016 at 44.7°C, out of 10 year(s) searched.
Data & provenance
↓ Download monthly CSVData source & coverage — ERA5 reanalysis, 2016–2025 (10 years)details
- Source
- ERA5 reanalysis, accessed via the Copernicus Climate Change Service (C3S) Climate Data Store
- Data type
- Reanalysis — a physically consistent reconstruction combining a forecast model with historical observations, not a live station reading or a forecast
- Coverage
- 2016–2025 (10 years) for United States
- Location
- South Tucson — 32.250°, -111.000°, ERA5 grid cell center, 6.4 km from requested point
- Time zone
- America/Phoenix
- What's shown here
- Monthly and annual averages, and dated extreme-value records, derived from an hourly base record.
- Spatial resolution
- 0.25° (~25 km) distributed grid — ERA5's native model resolution is finer; this is the publicly distributed regridded product
- Version / refreshed
- Methodology v2026.07 · data last refreshed December 31, 2025
- Limitations
- A model reconstruction, not a station observation — hyper-local extremes (a single storm cell, an urban heat pocket) can differ from a nearby gauge. See the full methodology.
- Attribution
- Generated using Copernicus Climate Change Service information
Cite this data
PastClimate (2026-07-17). Historical climate data for South Tucson, United States (32.25°N, 111.00°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for South Tucson, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 17, 2026, from https://www.pastclimate.com/
"Historical Climate Data for South Tucson, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 17, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for South Tucson, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-17},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.