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Topics / Climate / United States / Idaho

Was September normal in Idaho?

September 2026 · 44 counties · data family: climatedata.dev

Near normal

55.8°FStatewide average temperature, September 2026

Every Idaho county, September 2026September 2026 by county: 3 much warmer, 15 warmer, 26 near normal; furthest above normal Madison County (+2.4°F), furthest below Adams County (-1.9°F).Choose a county to see its answer. The colour shows how far each county was from its own 1991–2020 normal.
Indicator: Monthly average temperature minus the county's 1991–2020 normal for September, °F (NOAA nClimDiv via climatedata.dev); words from each county's rank in its own recordSource: climatedata.dev us-climate, version 2026-10-25.6c7474e6d8; boundaries: U.S. Census Bureau TIGERweb, counties (generalised), EPSG:5070 (CONUS Albers equal-area)
Every September since 1895, Idaho statewideSeptember 2026 averaged 55.8°F, -0.6°F against the 1991–2020 normal: the 52nd warmest September of 132 since 1895.
45.050.055.060.065.01900192019401960198020002020normal 56.4°F
Indicator: Monthly average temperature, °F (NOAA nClimDiv via climatedata.dev); normal = NOAA's 1991–2020 normal for that monthSource: climatedata.dev us-climate, version 2026-10-25.6c7474e6d8; NOAA Monthly U.S. Climate Divisional Database (nClimDiv), statewide and national files; climatedata.dev county-climate, version 2026-10-25.b4bbb5298a
Show the numbers (132 rows)
YearSeptember average
202655.8°F
202560.7°F
202459.4°F
202356.6°F
202260.8°F
202157.2°F
202058.7°F
201955.0°F
201856.2°F
201755.7°F
201654.6°F
201557.2°F
201457.6°F
201357.1°F
201258.4°F
201159.6°F
201056.4°F
200960.1°F
200855.5°F
200754.9°F
200655.1°F
200554.1°F
200453.7°F
200356.7°F
200255.9°F
200159.4°F
200054.0°F
199954.2°F
199860.4°F
199757.4°F
199652.5°F
199556.8°F
199458.9°F
199354.6°F
199254.2°F
199157.0°F
199061.7°F
198955.7°F
198854.5°F
198757.8°F
198649.9°F
198549.2°F
198452.5°F
198354.0°F
198253.9°F
198156.6°F
198055.2°F
197958.4°F
197853.4°F
197753.7°F
197656.2°F
197555.3°F
197455.8°F
197354.0°F
197251.0°F
197150.0°F
197049.9°F
196956.5°F
196853.6°F
196759.6°F
196658.9°F
196548.6°F
196452.1°F
196359.7°F
196256.1°F
196150.0°F
196057.2°F
195952.4°F
195854.6°F
195756.5°F
195655.6°F
195554.4°F
195454.6°F
195357.7°F
195257.7°F
195154.9°F
195054.9°F
194957.0°F
194855.0°F
194755.2°F
194653.4°F
194552.2°F
194455.8°F
194357.8°F
194255.9°F
194150.1°F
194056.7°F
193956.0°F
193860.2°F
193757.6°F
193653.8°F
193557.5°F
193452.8°F
193353.2°F
193255.0°F
193154.6°F
193054.9°F
192951.0°F
192855.5°F
192752.5°F
192649.2°F
192554.6°F
192454.7°F
192356.9°F
192257.4°F
192149.6°F
192054.3°F
191955.2°F
191857.0°F
191757.0°F
191654.0°F
191552.5°F
191452.3°F
191354.7°F
191248.6°F
191152.6°F
191055.2°F
190955.2°F
190854.9°F
190753.9°F
190656.0°F
190555.8°F
190456.4°F
190351.3°F
190253.2°F
190150.6°F
190052.8°F
189956.7°F
189855.0°F
189755.1°F
189653.1°F
189551.0°F

All 44 counties, September 2026

Record rank: 1 is the warmest September on record for that county.

1Madison58.7°F+2.4°F12 of 132Much warmer than normal
2Bonneville57.3°F+2.0°F13 of 132Much warmer than normal
3Jefferson59.4°F+2.0°F12 of 132Much warmer than normal
4Teton54.7°F+1.5°F23 of 132Warmer than normal
5Bingham59.1°F+1.2°F28 of 132Warmer than normal
6Caribou55.9°F+0.9°F28 of 132Warmer than normal
7Franklin58.5°F+0.8°F30 of 132Warmer than normal
8Bannock58.9°F+0.7°F36 of 132Warmer than normal
9Bear Lake54.6°F+0.7°F25 of 132Warmer than normal
10Oneida59.9°F+0.5°F37 of 132Warmer than normal
11Fremont53.7°F+0.4°F43 of 132Warmer than normal
12Power59.2°F+0.3°F40 of 132Warmer than normal
13Butte55.9°F+0.2°F37 of 132Warmer than normal
14Minidoka60.0°F+0.2°F35 of 132Warmer than normal
15Clark54.0°F+0.1°F42 of 132Warmer than normal
16Jerome61.5°F+0.0°F36 of 132Warmer than normal
17Lincoln60.1°F+0.0°F39 of 132Warmer than normal
18Cassia59.2°F−0.1°F38 of 132Warmer than normal
19Twin Falls60.1°F−0.3°F51 of 132Near normal
20Gooding61.6°F−0.4°F48 of 132Near normal
21Blaine55.4°F−0.5°F50 of 132Near normal
22Custer50.6°F−0.7°F51 of 132Near normal
23Idaho53.0°F−0.7°F56 of 132Near normal
24Lemhi51.6°F−0.8°F52 of 132Near normal
25Camas53.9°F−0.9°F55 of 132Near normal
26Owyhee59.4°F−0.9°F60 of 132Near normal
27Elmore59.0°F−1.0°F62 of 132Near normal
28Lewis56.8°F−1.0°F60 of 132Near normal
29Ada63.2°F−1.1°F68 of 132Near normal
30Bonner53.8°F−1.2°F65 of 132Near normal
31Kootenai55.8°F−1.3°F72 of 132Near normal
32Boise55.3°F−1.4°F71 of 132Near normal
33Gem60.9°F−1.4°F70 of 132Near normal
34Clearwater53.9°F−1.5°F76 of 132Near normal
35Latah56.4°F−1.5°F73 of 132Near normal
36Payette62.5°F−1.6°F69 of 132Near normal
37Valley50.3°F−1.6°F71 of 132Near normal
38Benewah55.4°F−1.7°F77 of 132Near normal
39Boundary51.3°F−1.7°F81 of 132Near normal
40Nez Perce59.2°F−1.7°F74 of 132Near normal
41Canyon62.4°F−1.8°F73 of 132Near normal
42Shoshone52.6°F−1.8°F78 of 132Near normal
43Washington59.8°F−1.8°F76 of 132Near normal
44Adams55.1°F−1.9°F78 of 132Near normal

Get this data

This page's numbers, as JSON:

curl https://visualizedata.org/data/topics/climate/us-id.json

The climatedata.dev API it comes from (live, no key; every month since 1895 with its normal, anomaly and rank):

curl "https://api.climatedata.dev/v1/us-climate/tavg/us-id.json"

Open the JSON

What this can't tell you

  • A statewide average is not the average of its counties: NOAA computes it from its own grid, weighted by area.
  • The most recent months are preliminary and NOAA revises them in the next release.

How the answer is decided

Each month is ranked against the same month in every year on record (since 1895 for most places). The top tenth of the record is 'much warmer than normal', the top third 'warmer', the middle third 'near normal'. Counties are coloured by the same five words.

Sources

Every topic for one county: How's Hennepin County?