Is this weather normal in San Juan County?

Washington · county records since 1895, through September 2026.

Weather › Washington › San Juan County

10 of the last 12 months ran warmer than usual in San Juan County. San Juan County has warmed about 0.4° per decade since 1970.

This week

Usual for Oct 28 to Nov 3: highs near 54°, lows near 42°

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

Loading the forecast...

usual high for the datewarmercooler

The last 12 months

Oct: +0.1°OctNov: +2.2°NovDec: +3.9°DecJan 2026: +2.6°JanFeb: +1.2°FebMar: +0.1°MarApr: +1.3°AprMay: +2.2°MayJun: +1.5°JunJul: 0.0°JulAug: +0.4°AugSep: -1.9°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: +0.1 inOctNov: -0.5 inNovDec: +3.9 inDecJan 2026: -0.3 inJanFeb: -0.6 inFebMar: +2.6 inMarApr: -0.8 inAprMay: -0.8 inMayJun: -0.1 inJunJul: 0.0 inJulAug: -0.3 inAugSep: +0.7 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 San Juan County

MonthUsual high / lowUsual rainWarmestColdest
January46° / 36°4.0 in45.2° 201024.4° 1950
February48° / 36°2.5 in46.5° 201531.4° 1936
March52° / 38°2.5 in49.0° 194138.1° 1955
April57° / 41°2.0 in53.3° 201644.2° 1972
May63° / 46°1.6 in58.2° 202349.3° 1955
June68° / 49°1.2 in62.4° 201554.3° 1971
July73° / 52°0.8 in65.9° 195857.7° 1955
August73° / 53°1.0 in65.6° 202258.2° 1973
September67° / 50°1.6 in61.4° 202553.9° 1972
October58° / 44°3.2 in55.1° 201446.6° 1905
November50° / 39°4.6 in50.0° 189933.6° 1985
December45° / 36°3.9 in45.6° 193934.3° 1983

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

Towns in San Juan County

Crime Radar: Ferndale, Blaine

Nearby counties