June is one of the warmer months of the year in Flagstaff, with average highs near 29.3°C and lows around 11.8°C (mean 20.6°C). It is one of the drier months, averaging 9 mm of rainfall and 30% relative humidity across the period.
June is one of the warmer months of the year in Flagstaff. Across 45 years of records, the warmest June in Flagstaff was 2021 — when the month averaged 23.9°C — while the coldest was 1995 at 17°C. Typical June days reach 29.3°C with nights near 11.8°C. The long-term trend is warming, about 0.6°C per decade.
June is one of the drier months in Flagstaff, averaging 9 mm of rainfall. The wettest June on record was 2015 with 45 mm, while the driest were 2011 and 2013 at 0 mm.
Relative humidity in Flagstaff during June averages 30%. The most humid June was 1992 at 41%, and the least humid was 2002 at 16%.
June receives about 8.2 kWh/m²/day of solar energy in Flagstaff. The sunniest June was 2011 at 8.9 kWh/m²/day, and the cloudiest was 1988 at 7.2.
Average wind speed in Flagstaff during June is 2.7 m/s. The windiest June was 1998 at 3.4 m/s, while the calmest were 1987, 1988 and 2015 at 2.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 19.9°C | 19.2°C | 20.9°C | 21.6°C | 21.8°C | +1.9°C |
| Avg High | 28.6°C | 27.8°C | 29.7°C | 30.6°C | 30.4°C | +1.8°C |
| Avg Low | 11.2°C | 10.6°C | 12.0°C | 12.6°C | 13.3°C | +2.1°C |
| Avg Rain | 11 mm | 8 mm | 8 mm | 8 mm | 13 mm | +2 mm |
June temperatures in Flagstaff have risen by about 2.4°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 0.3°C (1993) to a record high of 38.7°C (2021).
Rainfall in June is one of the drier months, averaging 9 mm, with a wettest year of 45 mm.
One of the best times to visit Flagstaff
June is one of the best times to visit Flagstaff. Expect days averaging 29.3°C and nights around 11.8°C (mean 20.6°C) — warmer than Flagstaff's yearly average — with low rainfall (9 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 31.1°C | 22.3°C | 13.4°C | 36.0°C | 10.5°C | 18 mm | 29% | 2.6 m/s | 8.2 |
| 2024 | 31.7°C | 23.5°C | 15.3°C | 35.6°C | 9.9°C | 19 mm | 34% | 2.5 m/s | 7.8 |
| 2023 | 26.9°C | 18.3°C | 9.8°C | 31.2°C | 5.5°C | 2 mm | 33% | 2.8 m/s | 8.3 |
| 2022 | 30.6°C | 22.2°C | 13.9°C | 34.7°C | 5.5°C | 33 mm | 33% | 2.5 m/s | 7.8 |
| 2021 🔥 | 32.5°C | 23.9°C | 15.3°C | 38.7°C | 10.0°C | 6 mm | 25% | 2.5 m/s | 7.6 |
| 2020 | 29.5°C | 20.9°C | 12.3°C | 34.9°C | 2.4°C | 0 mm | 27% | 3 m/s | 8.6 |
| 2019 | 28.9°C | 20.1°C | 11.3°C | 32.8°C | 6.3°C | 1 mm | 33% | 2.5 m/s | 8.3 |
| 2018 | 31.4°C | 22.3°C | 13.2°C | 36.6°C | 8.5°C | 8 mm | 23% | 2.8 m/s | 8.6 |
| 2017 | 31.8°C | 22.5°C | 13.1°C | 37.0°C | 3.9°C | 2 mm | 27% | 2.5 m/s | 8.4 |
| 2016 | 31.4°C | 22.7°C | 14.1°C | 37.5°C | 9.0°C | 15 mm | 31% | 2.3 m/s | 8 |
| 2015 🌧️ | 30.0°C | 21.8°C | 13.5°C | 35.3°C | 6.8°C | 45 mm | 38% | 2.1 m/s | 7.9 |
| 2014 | 30.3°C | 21.2°C | 12.1°C | 34.7°C | 8.0°C | 0 mm | 21% | 3.1 m/s | 8.8 |
| 2013 | 31.8°C | 22.6°C | 13.5°C | 37.8°C | 7.9°C | 0 mm | 22% | 2.8 m/s | 8.5 |
| 2012 | 31.8°C | 22.5°C | 13.2°C | 35.2°C | 8.8°C | 2 mm | 21% | 2.7 m/s | 8.8 |
| 2011 | 29.3°C | 20.1°C | 10.8°C | 34.9°C | 5.5°C | 0 mm | 23% | 3.2 m/s | 8.9 |
| 2010 | 29.3°C | 20.3°C | 11.3°C | 36.4°C | 4.9°C | 3 mm | 30% | 2.7 m/s | 8.4 |
| 2009 | 25.9°C | 18.3°C | 10.7°C | 32.9°C | 4.6°C | 8 mm | 38% | 2.5 m/s | 7.5 |
| 2008 | 29.8°C | 20.6°C | 11.3°C | 34.4°C | 3.1°C | 2 mm | 27% | 2.6 m/s | 8.6 |
| 2007 | 30.2°C | 21.3°C | 12.3°C | 34.2°C | 3.9°C | 1 mm | 23% | 2.7 m/s | 8.4 |
| 2006 | 31.4°C | 22.4°C | 13.4°C | 34.8°C | 9.3°C | 13 mm | 27% | 2.3 m/s | 8.3 |
| 2005 | 27.4°C | 18.8°C | 10.3°C | 34.1°C | 5.8°C | 11 mm | 37% | 2.9 m/s | 8.2 |
| 2004 | 29.8°C | 20.8°C | 11.7°C | 33.5°C | 4.3°C | 3 mm | 23% | 2.6 m/s | 8.4 |
| 2003 | 30.0°C | 20.9°C | 11.8°C | 34.3°C | 7.4°C | 2 mm | 25% | 2.8 m/s | 8.4 |
| 2002 | 31.8°C | 22.6°C | 13.4°C | 36.1°C | 8.9°C | 0 mm | 16% | 3 m/s | 8.8 |
| 2001 | 30.5°C | 21.4°C | 12.2°C | 35.5°C | 3.1°C | 7 mm | 25% | 2.7 m/s | 8.5 |
| 2000 | 30.0°C | 21.4°C | 12.8°C | 35.5°C | 7.5°C | 27 mm | 33% | 2.6 m/s | 7.7 |
| 1999 | 28.0°C | 19.3°C | 10.6°C | 35.6°C | 0.6°C | 15 mm | 33% | 2.8 m/s | 8.2 |
| 1998 | 26.4°C | 17.7°C | 8.9°C | 35.3°C | 4.2°C | 2 mm | 33% | 3.4 m/s | 8.7 |
| 1997 | 27.9°C | 19.3°C | 10.7°C | 33.0°C | 5.7°C | 8 mm | 30% | 2.9 m/s | 8.3 |
| 1996 | 30.5°C | 21.5°C | 12.6°C | 34.2°C | 8.3°C | 4 mm | 23% | 2.7 m/s | 8.2 |
| 1995 ❄️ | 25.5°C | 17.0°C | 8.5°C | 31.4°C | 1.2°C | 5 mm | 36% | 2.7 m/s | 7.8 |
| 1994 | 30.7°C | 21.9°C | 13.0°C | 36.9°C | 8.8°C | 8 mm | 30% | 2.5 m/s | 8 |
| 1993 | 26.4°C | 17.9°C | 9.4°C | 32.9°C | 0.3°C | 6 mm | 39% | 2.8 m/s | 8.4 |
| 1992 | 26.6°C | 18.3°C | 10.1°C | 30.9°C | 5.0°C | 12 mm | 41% | 2.8 m/s | 7.8 |
| 1991 | 25.5°C | 17.5°C | 9.4°C | 31.3°C | 3.5°C | 11 mm | 36% | 2.7 m/s | 8 |
| 1990 | 30.5°C | 21.4°C | 12.4°C | 36.6°C | 3.4°C | 10 mm | 27% | 2.7 m/s | 8.5 |
| 1989 | 29.1°C | 20.2°C | 11.3°C | 34.8°C | 6.3°C | 1 mm | 25% | 2.9 m/s | 8.3 |
| 1988 | 28.7°C | 20.4°C | 12.2°C | 34.2°C | 5.0°C | 34 mm | 40% | 2.1 m/s | 7.2 |
| 1987 | 29.0°C | 20.2°C | 11.3°C | 31.9°C | 7.1°C | 9 mm | 36% | 2.1 m/s | 8 |
| 1986 | 28.6°C | 20.2°C | 11.8°C | 33.6°C | 6.6°C | 16 mm | 35% | 2.3 m/s | 7.7 |
| 1985 | 29.7°C | 20.6°C | 11.5°C | 33.8°C | 4.7°C | 4 mm | 31% | 2.3 m/s | 8 |
| 1984 | 27.3°C | 19.2°C | 11.0°C | 33.1°C | 4.4°C | 10 mm | 34% | 3 m/s | 7.4 |
| 1983 | 26.4°C | 17.9°C | 9.3°C | 31.5°C | 4.1°C | 2 mm | 36% | 2.6 m/s | — |
| 1982 | 27.5°C | 18.6°C | 9.7°C | 33.0°C | 4.5°C | 0 mm | 27% | 2.7 m/s | — |
| 1981 | 30.9°C | 21.8°C | 12.8°C | 36.8°C | 4.8°C | 21 mm | 28% | 2.6 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 29.3°C with lows near 11.8°C (mean 20.6°C), based on 45 years of NASA POWER data.
June averages 9 mm of rainfall in Flagstaff, one of the drier months. The wettest on record was 45 mm in 2015.
The hottest June reached 38.7°C in 2021. The coldest dipped to 0.3°C in 1993.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 2.4°C. Daytime highs moved from 28.4°C to 30.6°C and overnight lows from 10.9°C to 13.5°C over the same span.
June is one of the warmer months of the year in Flagstaff and one of the drier months, so plan for around 29.3°C daytime highs and 11.8°C at night.
Not quite — June is the 10th coolest month in Flagstaff, averaging 20.6°C.
For June in Flagstaff, pack light layers you can adjust through the day, with typical highs of 29.3°C and lows of 11.8°C.
Relative humidity in June averages 30% — relatively dry.
Average wind speed in June is 2.7 m/s. The windiest June on record averaged 3.4 m/s (1998).
The wettest June on record was 2015 with 45 mm. On average, June sees 9 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Flagstaff behaves each June, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for June specifically, along with year-by-year records and how the month has changed over the decades.
