Pocatello weather in September: Pocatello, Idaho: normal highs, lows, rain and records for September
Pocatello in September has a normal high of 77°F and a normal low of 42°F, a daily mean of 60°F, falling from 84°F on the 1st to 70°F by the 30th. Measurable precipitation falls on 5 days in a normal September, 0.89 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 25°C and low of 6°C, 23 mm of precipitation in September.
- NOAA stationPocatello Regional Airport
- Station IDUSW00024156
- Location42.92°N 112.57°W
- Elevation4,478 ft (1,365 m)
- Population58,231
- Jan 34° 17°
- Feb 39° 20°
- Mar 51° 28°
- Apr 59° 33°
- May 69° 40°
- Jun 79° 46°
- Jul 89° 52°
- Aug 88° 51°
- Sep 77° 42°
- Oct 62° 33°
- Nov 46° 24°
- Dec 34° 17°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Pocatello in September?
The normal high is 77°F and the normal low 42°F, for a daily mean of 59.7°F. September is 9.6°F cooler than August and 12.6°F warmer than October. September is the 4th warmest month of the year in Pocatello and the 10th wettest. Across the month the normal high falls 14°F, from 84°F on September 1 to 70°F on September 30. From one year to the next September's mean temperature typically moves about 2.0°F either way (NOAA's standard deviation), so roughly two Septembers in three average between 58°F and 62°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 18%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| September 1 | 84°F | 46°F | 15% | 7% |
| September 8 | 81°F | 44°F | 16% | 8% |
| September 15 | 78°F | 42°F | 17% | 9% |
| September 22 | 74°F | 40°F | 18% | 10% |
| September 30 | 70°F | 38°F | 18% | 10% |
Every day of September: normal high, low and chance of precipitation (warmest afternoon September 1, coldest night September 30)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| September 1 | 84°F | 46°F | 15% | 7% | 13 h 10 min |
| September 2 | 83°F | 46°F | 16% | 7% | 13 h 10 min |
| September 3 | 83°F | 46°F | 16% | 8% | 13 h 10 min |
| September 4 | 82°F | 46°F | 16% | 8% | 13 h 10 min |
| September 5 | 82°F | 45°F | 16% | 8% | 13 h |
| September 6 | 82°F | 45°F | 16% | 8% | 13 h |
| September 7 | 81°F | 45°F | 16% | 8% | 13 h |
| September 8 | 81°F | 44°F | 16% | 8% | 12 h 50 min |
| September 9 | 80°F | 44°F | 16% | 8% | 12 h 50 min |
| September 10 | 80°F | 44°F | 17% | 9% | 12 h 50 min |
| September 11 | 80°F | 44°F | 17% | 9% | 12 h 50 min |
| September 12 | 79°F | 43°F | 17% | 9% | 12 h 40 min |
| September 13 | 79°F | 43°F | 17% | 9% | 12 h 40 min |
| September 14 | 78°F | 43°F | 17% | 9% | 12 h 40 min |
| September 15 | 78°F | 42°F | 17% | 9% | 12 h 30 min |
| September 16 | 77°F | 42°F | 17% | 9% | 12 h 30 min |
| September 17 | 77°F | 42°F | 17% | 9% | 12 h 30 min |
| September 18 | 76°F | 42°F | 17% | 10% | 12 h 30 min |
| September 19 | 76°F | 41°F | 18% | 10% | 12 h 20 min |
| September 20 | 75°F | 41°F | 18% | 10% | 12 h 20 min |
| September 21 | 75°F | 41°F | 18% | 10% | 12 h 20 min |
| September 22 | 74°F | 40°F | 18% | 10% | 12 h 10 min |
| September 23 | 74°F | 40°F | 18% | 10% | 12 h 10 min |
| September 24 | 73°F | 40°F | 18% | 10% | 12 h 10 min |
| September 25 | 73°F | 39°F | 18% | 10% | 12 h 10 min |
| September 26 | 72°F | 39°F | 18% | 10% | 12 h |
| September 27 | 72°F | 39°F | 18% | 10% | 12 h |
| September 28 | 71°F | 39°F | 18% | 10% | 12 h |
| September 29 | 71°F | 38°F | 18% | 10% | 11 h 50 min |
| September 30 | 70°F | 38°F | 18% | 10% | 11 h 50 min |
- Normal high
- 77°FSeptember average
- Normal low
- 42°FSeptember average
- Precipitation
- 0.89 inmonth total
- Days with precipitation
- 50.01 inch or more
- Days at 90°F or more
- 3
- Nights at 32°F or colder
- 3
- Daylight
- 13 h 10 min to 11 h 50 minSeptember 1 to September 30
- Days at 70°F or more
- 23
- Days at 80°F or more
- 14
- Sunshine
- 85%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024156; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Pocatello in September?
On a given September day the chance of 0.01 inch or more is 17% on average, highest around September 30 (18%). In all, 0.89 in falls on 5 days of a normal September.
In a normal September in Pocatello, 3 days reach 90°F and 3 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024156.
How humid and windy is Pocatello in September?
At 3 p.m. the normal temperature is 69°F with 27% relative humidity and a dew point of 33°F; at 6 a.m. it is 42°F with 71% humidity. The wind averages 8.4 mph, most often from the west-southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 42°F | 33°F | 71% | 5.8 mph | 76% |
| 9 a.m. | 53°F | 36°F | 52% | 7.7 mph | 74% |
| noon | 64°F | 35°F | 34% | 10.5 mph | 71% |
| 3 p.m. | 69°F | 33°F | 27% | 11.9 mph | 68% |
| 6 p.m. | 63°F | 34°F | 33% | 8.8 mph | 71% |
| 9 p.m. | 54°F | 33°F | 45% | 8.5 mph | 78% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00024156. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for September in Pocatello?
The warmest September temperature on Pocatello's official record (since 1939) is 102°F, on September 3, 2022; the coldest is 19°F, on September 20, 1983. The wettest September brought 3.80 in (1940); the snowiest, 2.0 inches (1965).
The September mean against the 1991-2020 normal of 59.7°F: 2021 60.8°F (+1.1), 2022 64.5°F (+4.8), 2023 60.2°F (+0.5), 2024 62.4°F (+2.7), 2025 62.0°F (+2.3), 2026 60.8°F (+1.1). 6 of 6 ran warmer than normal.
| September | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 60.8°F | +1.1°F | 0.29 in |
| 2022 | 64.5°F | +4.8°F | 1.09 in |
| 2023 | 60.2°F | +0.5°F | 2.52 in |
| 2024 | 62.4°F | +2.7°F | 0.49 in |
| 2025 | 62.0°F | +2.3°F | 0.74 in |
| 2026 | 60.8°F | +1.1°F | 0.81 in |
Source: records: ACIS, NWS threaded record PIHthr; recent months: ACIS, station USW00024156. Records and recent months use complete months only.
How does September in Pocatello compare across Idaho?
Across the 85 places PlainClimate covers in Idaho, September normal highs run from 59°F in Mullan to 86°F in Glenns Ferry; Pocatello's is 77°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.