Is this weather normal in Ada County?

Idaho · county records since 1895, through September 2026.

Weather › Idaho › Ada County

Ada County is in severe drought: NOAA's Palmer reading for September was -3.3. Ada County has warmed about 0.4° per decade since 1970.

This week

Usual for Oct 28 to Nov 3: highs near 57°, lows near 34°

That is the 1991 to 2020 average for these dates in Ada County. The Weather Service forecast fills in below.

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usual high for the datewarmercooler

The last 12 months

Oct: -0.8°OctNov: +5.5°NovDec: +9.1°DecJan 2026: +1.4°JanFeb: +4.2°FebMar: +4.8°MarApr: -0.1°AprMay: +3.2°MayJun: +0.1°JunJul: +3.2°JulAug: +2.4°AugSep: -1.1°Sepwarmercooler

Each bar is a month's average temperature against the usual for that month (1991 to 2020). Ranks compare the same month in every year since 1895.

Every year since 1895

18952025

Rain and drought

Oct: +0.5 inOctNov: -0.8 inNovDec: +0.6 inDecJan 2026: -0.6 inJanFeb: +0.1 inFebMar: -0.5 inMarApr: +1.5 inAprMay: -1.3 inMayJun: -0.1 inJunJul: +0.0 inJulAug: -0.1 inAugSep: +0.0 inSepwetterdrier

Rain and melted snow against the usual for each month. The drought reading is NOAA's Palmer index for the county.

Month by month in Ada County

MonthUsual high / lowUsual rainWarmestColdest
January39° / 24°1.6 in41.3° 195310.4° 1949
February46° / 28°1.1 in43.7° 190721.9° 1933
March56° / 33°1.3 in49.8° 193433.0° 1917
April63° / 37°1.2 in57.0° 193443.1° 1975
May72° / 45°1.4 in64.8° 193451.6° 1896
June81° / 51°0.8 in74.2° 201560.1° 1953
July92° / 59°0.2 in81.6° 202164.6° 1993
August90° / 57°0.2 in79.1° 202265.2° 1899
September80° / 49°0.4 in69.2° 199056.2° 1985
October65° / 38°0.8 in59.3° 198844.0° 2019
November49° / 30°1.3 in46.3° 199928.8° 1985
December39° / 24°1.7 in41.2° 191715.2° 1985

Warmest and coldest are the month's whole-month average temperature, with the year it happened.

Towns in Ada County

Crime Radar: Meridian, Garden City

Nearby counties