September is one of the warmer months of the year in Pocatello, with average highs near 23.8°C and lows around 8.6°C (mean 16.2°C). It is about average for rainfall, averaging 29 mm of rainfall and 42% relative humidity across the period.
September is one of the warmer months of the year in Pocatello. Across 45 years of records, the warmest September in Pocatello was 2022 — when the month averaged 19.4°C — while the coldest was 1985 at 11.8°C. Typical September days reach 23.8°C with nights near 8.6°C. The long-term trend is warming, about 0.7°C per decade.
September is about average for rainfall in Pocatello, averaging 29 mm of rainfall. The wettest September on record was 2016 with 74 mm, while the driest was 2018 at 0 mm.
Relative humidity in Pocatello during September averages 42%. The most humid September was 2013 at 55%, and the least humid was 1987 at 30%.
September receives about 5.2 kWh/m²/day of solar energy in Pocatello. The sunniest Septembers were 1999, 2010 and 2018, among others at 5.7 kWh/m²/day, and the cloudiest were 1986 and 2017 at 4.4.
Average wind speed in Pocatello during September is 2.2 m/s. The windiest September was 2013 at 2.8 m/s, while the calmest was 1990 at 1.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.7°C | 16.1°C | 16.2°C | 16.7°C | 18.0°C | +3.3°C |
| Avg High | 22.3°C | 23.6°C | 23.9°C | 24.0°C | 25.7°C | +3.4°C |
| Avg Low | 7.0°C | 8.5°C | 8.4°C | 9.3°C | 10.4°C | +3.4°C |
| Avg Rain | 29 mm | 23 mm | 24 mm | 40 mm | 31 mm | +1 mm |
September temperatures in Pocatello have risen by about 3.6°C between 1981–1985 and 2021–2025.
September has ranged from a record low of -5.8°C (1985) to a record high of 37.1°C (2022).
Rainfall in September is about average for rainfall, averaging 29 mm, with a wettest year of 74 mm.
One of the best times to visit Pocatello
September is one of the best times to visit Pocatello. Expect days averaging 23.8°C and nights around 8.6°C (mean 16.2°C) — warmer than Pocatello's yearly average — with low rainfall (29 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 | 26.0°C | 18.8°C | 11.7°C | 33.5°C | 5.5°C | 25 mm | 44% | 2 m/s | 5.1 |
| 2024 | 26.2°C | 18.4°C | 10.7°C | 33.1°C | 5.2°C | 27 mm | 43% | 2.1 m/s | 5.2 |
| 2023 | 24.0°C | 16.9°C | 9.7°C | 28.4°C | 2.3°C | 67 mm | 52% | 2.1 m/s | 4.9 |
| 2022 🔥 | 27.1°C | 19.4°C | 11.7°C | 37.1°C | 5.9°C | 31 mm | 40% | 2.3 m/s | 5.3 |
| 2021 | 25.3°C | 17.2°C | 9.2°C | 34.3°C | 2.3°C | 16 mm | 36% | 2.2 m/s | 5.5 |
| 2020 | 25.5°C | 17.3°C | 9.2°C | 35.9°C | -0.4°C | 17 mm | 37% | 2.3 m/s | 5.6 |
| 2019 | 22.4°C | 15.8°C | 9.2°C | 35.3°C | -1.7°C | 69 mm | 51% | 2.5 m/s | 4.6 |
| 2018 | 25.6°C | 17.5°C | 9.3°C | 31.4°C | 2.7°C | 0 mm | 30% | 2.3 m/s | 5.7 |
| 2017 | 21.8°C | 15.1°C | 8.4°C | 34.2°C | -0.4°C | 73 mm | 52% | 2.1 m/s | 4.4 |
| 2016 🌧️ | 22.1°C | 15.4°C | 8.7°C | 32.6°C | 3.6°C | 74 mm | 50% | 2.3 m/s | 5 |
| 2015 | 25.3°C | 17.8°C | 10.4°C | 31.3°C | 3.5°C | 47 mm | 41% | 2.3 m/s | 5.3 |
| 2014 | 24.1°C | 16.5°C | 9.0°C | 31.2°C | -1.5°C | 61 mm | 50% | 2.4 m/s | 5.1 |
| 2013 | 22.6°C | 16.3°C | 9.9°C | 32.7°C | 1.2°C | 47 mm | 55% | 2.8 m/s | 4.5 |
| 2012 | 25.6°C | 17.7°C | 9.9°C | 30.0°C | 3.9°C | 11 mm | 36% | 1.9 m/s | 5.3 |
| 2011 | 25.9°C | 18.0°C | 10.0°C | 30.1°C | 5.8°C | 11 mm | 41% | 2 m/s | 5.6 |
| 2010 | 24.9°C | 16.5°C | 8.2°C | 30.1°C | 3.0°C | 8 mm | 37% | 2.4 m/s | 5.7 |
| 2009 | 26.4°C | 18.5°C | 10.6°C | 32.1°C | 1.4°C | 18 mm | 38% | 2.1 m/s | 5.3 |
| 2008 | 24.4°C | 16.3°C | 8.1°C | 29.8°C | 3.4°C | 6 mm | 35% | 2.1 m/s | 5.6 |
| 2007 | 22.9°C | 15.4°C | 7.8°C | 33.8°C | -2.2°C | 32 mm | 43% | 2.5 m/s | 5 |
| 2006 | 22.3°C | 14.8°C | 7.4°C | 31.0°C | -0.5°C | 48 mm | 44% | 2.1 m/s | 4.9 |
| 2005 | 23.0°C | 15.3°C | 7.5°C | 31.7°C | 0.1°C | 31 mm | 42% | 2.4 m/s | 5.3 |
| 2004 | 22.6°C | 15.1°C | 7.7°C | 31.0°C | 0.5°C | 25 mm | 44% | 2.4 m/s | 4.9 |
| 2003 | 23.9°C | 16.1°C | 8.3°C | 32.1°C | 0.7°C | 17 mm | 37% | 2.1 m/s | 5.3 |
| 2002 | 23.5°C | 16.1°C | 8.8°C | 33.1°C | 2.1°C | 35 mm | 41% | 2.4 m/s | 5 |
| 2001 | 26.6°C | 18.5°C | 10.3°C | 33.6°C | 1.8°C | 17 mm | 35% | 2.3 m/s | 5.4 |
| 2000 | 23.6°C | 15.5°C | 7.5°C | 33.7°C | -2.6°C | 11 mm | 39% | 2.5 m/s | 5.3 |
| 1999 | 22.9°C | 14.8°C | 6.6°C | 28.3°C | -3.7°C | 7 mm | 36% | 2.1 m/s | 5.7 |
| 1998 | 24.5°C | 17.6°C | 10.6°C | 32.6°C | 4.3°C | 53 mm | 51% | 1.9 m/s | 4.9 |
| 1997 | 23.2°C | 16.4°C | 9.5°C | 31.3°C | 2.2°C | 44 mm | 54% | 2.3 m/s | 5 |
| 1996 | 20.9°C | 13.5°C | 6.0°C | 30.2°C | -2.0°C | 26 mm | 44% | 2.4 m/s | 4.9 |
| 1995 | 23.9°C | 16.5°C | 9.2°C | 34.6°C | -2.3°C | 12 mm | 40% | 2.1 m/s | 5.1 |
| 1994 | 25.9°C | 18.0°C | 10.2°C | 32.4°C | 4.2°C | 23 mm | 30% | 2.1 m/s | 5.3 |
| 1993 | 21.9°C | 14.4°C | 6.9°C | 28.4°C | 0.5°C | 10 mm | 41% | 2.2 m/s | 5.2 |
| 1992 | 22.9°C | 14.9°C | 7.0°C | 29.0°C | 1.3°C | 11 mm | 37% | 2.6 m/s | 5.1 |
| 1991 | 23.2°C | 15.6°C | 8.0°C | 30.4°C | 0.1°C | 26 mm | 45% | 1.9 m/s | 5.1 |
| 1990 | 26.9°C | 19.2°C | 11.5°C | 33.1°C | 5.8°C | 17 mm | 38% | 1.8 m/s | 5.3 |
| 1989 | 23.7°C | 15.6°C | 7.5°C | 28.8°C | 2.6°C | 19 mm | 38% | 2.4 m/s | 5.7 |
| 1988 | 23.1°C | 14.9°C | 6.7°C | 32.9°C | 0.3°C | 4 mm | 34% | 2.4 m/s | 5 |
| 1987 | 25.3°C | 16.9°C | 8.5°C | 32.8°C | 2.1°C | 1 mm | 30% | 1.9 m/s | 5.6 |
| 1986 | 18.9°C | 12.3°C | 5.6°C | 29.1°C | -2.1°C | 50 mm | 55% | 2.2 m/s | 4.4 |
| 1985 ❄️ | 19.1°C | 11.8°C | 4.5°C | 27.5°C | -5.8°C | 46 mm | 48% | 2.6 m/s | 5 |
| 1984 | 21.6°C | 13.8°C | 5.9°C | 30.8°C | -3.3°C | 17 mm | 44% | 2.4 m/s | 5 |
| 1983 | 22.6°C | 15.0°C | 7.4°C | 32.3°C | -5.5°C | 53 mm | 47% | 2.5 m/s | — |
| 1982 | 21.3°C | 14.4°C | 7.5°C | 30.5°C | 0.3°C | 69 mm | 53% | 2.3 m/s | — |
| 1981 | 25.5°C | 17.3°C | 9.1°C | 31.8°C | -0.3°C | 5 mm | 34% | 2.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 23.8°C with lows near 8.6°C (mean 16.2°C), based on 45 years of NASA POWER data.
September averages 29 mm of rainfall in Pocatello, about average for rainfall. The wettest on record was 74 mm in 2016.
The hottest September reached 37.1°C in 2022. The coldest dipped to -5.8°C in 1985.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 3.6°C. Daytime highs moved from 22°C to 25.7°C and overnight lows from 6.9°C to 10.6°C over the same span.
September is one of the warmer months of the year in Pocatello and about average for rainfall, so plan for around 23.8°C daytime highs and 8.6°C at night.
Not quite — September is the 9th coolest month in Pocatello, averaging 16.2°C.
For September in Pocatello, pack light layers you can adjust through the day, with typical highs of 23.8°C and lows of 8.6°C.
Relative humidity in September averages 42% — relatively dry.
Average wind speed in September is 2.2 m/s. The windiest September on record averaged 2.8 m/s (2013).
The wettest September on record was 2016 with 74 mm. On average, September sees 29 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 Pocatello behaves each September, 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 September specifically, along with year-by-year records and how the month has changed over the decades.
