September
September · August · July
76climate match
United States · 1991–2020
Best time to visit
Arlington.
September leads for comfortable weather in Arlington: typically 23.7°C by day, 9.1°C at night, with 94 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high23.7°C
Typical low9.1°C
Rain in September94 mm
July
July · August · June
63climate match
September
September · May · October
72climate match
The weakest month is January, scoring 5 against September’s 76 — days reach only -2.8°C, 27° below the 24°C the score treats as ideal.
Month by month
The whole year,
without the guesswork.
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
Jan
5-2.8° / -13.9°
Feb
5-0.2° / -11.7°
Mar
57.1° / -5.3°
Apr
3115.1° / 1.2°
May
6021.3° / 7.6°
Jun
6726.4° / 13.1°
Jul
7028.1° / 15.5°
Aug
7527.2° / 14.1°
Sep
7623.7° / 9.1°
Oct
4416.6° / 2.6°
Nov
77.6° / -3.9°
Dec
50.5° / -9.7°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -2.8°C | -13.9°C | 31 mm | 5.6 | 9 h 21 | 5 | Strong coverage |
| February | -0.2°C | -11.7°C | 31 mm | 5.3 | 10 h 28 | 5 | Strong coverage |
| March | 7.1°C | -5.3°C | 51 mm | 6.3 | 11 h 47 | 5 | Strong coverage |
| April | 15.1°C | 1.2°C | 102 mm | 8.7 | 13 h 19 | 31 | Strong coverage |
| May | 21.3°C | 7.6°C | 116 mm | 10 | 14 h 36 | 60 | Strong coverage |
| June | 26.4°C | 13.1°C | 145 mm | 10.1 | 15 h 18 | 67 | Strong coverage |
| July | 28.1°C | 15.5°C | 113 mm | 8.1 | 15 h 02 | 70 | Strong coverage |
| August | 27.2°C | 14.1°C | 99 mm | 7.8 | 13 h 55 | 75 | Strong coverage |
| September | 23.7°C | 9.1°C | 94 mm | 7.5 | 12 h 26 | 76 | Strong coverage |
| October | 16.6°C | 2.6°C | 75 mm | 6.7 | 10 h 58 | 44 | Strong coverage |
| November | 7.6°C | -3.9°C | 54 mm | 5.4 | 9 h 41 | 7 | Strong coverage |
| December | 0.5°C | -9.7°C | 42 mm | 5.9 | 9 h 03 | 5 | Strong coverage |
What has changed
Arlington runs -0.6°C
on the 1961–1990 baseline.
Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.
Jan
-0.2
Feb
-1.6
Mar
+0.4
Apr
-2.0
May
-1.7
Jun
-0.7
Jul
-1.6
Aug
-1.4
Sep
+0.4
Oct
-0.6
Nov
-0.1
Dec
+2.0
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 17.8°C1 Jan 1897 | -40.6°C31 Jan 2019 | 39 mm12 Jan 1960 | 71 mm1969 · driest 2 mm in 2025 | 115 |
| February | 23.3°C27 Feb 2024 | -43.9°C3 Feb 1996 | 41 mm24 Feb 1975 | 85 mm1971 · driest 0 mm in 1958 | 116 |
| March | 31.1°C29 Mar 1895 | -35.0°C1 Mar 1962 | 82 mm31 Mar 1998 | 147 mm2022 · driest 0 mm in 1919 | 116 |
| April | 33.3°C30 Apr 1895 | -18.3°C4 Apr 1975 | 91 mm18 Apr 1909 | 250 mm2008 · driest 9 mm in 1942 | 116 |
| May | 35.0°C28 May 2018 | -7.2°C3 May 2005 | 114 mm17 May 1999 | 300 mm1902 · driest 12 mm in 1981 | 116 |
| June | 39.4°C21 Jun 1988 | -0.6°C1 Jun 1897 | 114 mm22 Jun 2013 | 316 mm1902 · driest 27 mm in 1977 | 119 |
| July | 43.9°C24 Jul 1901 | 1.7°C7 Jul 1984 | 169 mm26 Jul 1940 | 323 mm1903 · driest 4 mm in 1894 | 117 |
| August | 42.2°C16 Aug 1913 | -1.1°C30 Aug 1893 | 111 mm2 Aug 1981 | 284 mm2007 · driest 4 mm in 1969 | 116 |
| September | 38.9°C9 Sep 1955 | -8.3°C30 Sep 1899 | 89 mm5 Sep 2012 | 281 mm2018 · driest 6 mm in 2004 | 116 |
| October | 34.4°C6 Oct 1963 | -13.9°C29 Oct 1952 | 125 mm23 Oct 2020 | 190 mm2018 · driest 0 mm in 1952 | 114 |
| November | 26.1°C8 Nov 1999 | -30.0°C26 Nov 1977 | 89 mm4 Nov 2003 | 160 mm1991 · driest 0 mm in 1914 | 115 |
| December | 21.1°C16 Dec 2021 | -36.7°C25 Dec 2000 | 61 mm14 Dec 2015 | 139 mm2015 · driest 2 mm in 1998 | 115 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 29 | <1 | 6 |
| February | 0 | 0 | 26 | <1 | 5 |
| March | <1 | 0 | 24 | 2 | 3 |
| April | 2 | <1 | 13 | 3 | <1 |
| May | 9 | 2 | 2 | 4 | 0 |
| June | 19 | 6 | 0 | 4 | 0 |
| July | 25 | 10 | 0 | 4 | 0 |
| August | 23 | 6 | 0 | 3 | 0 |
| September | 13 | 3 | 1 | 3 | 0 |
| October | 3 | <1 | 11 | 2 | <1 |
| November | 0 | 0 | 22 | 2 | 2 |
| December | 0 | 0 | 28 | 1 | 5 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 16% | 3% | 9% | -6.7–0.6°C |
| February | <1% | 16% | 3% | 10% | -4.0–4.1°C |
| March | 5% | 20% | 6% | 19% | 3.3–10.7°C |
| April | 21% | 26% | 9% | 30% | 12.5–18.6°C |
| May | 48% | 31% | 12% | 40% | 19.5–24.8°C |
| June | 66% | 31% | 13% | 36% | 24.8–29.3°C |
| July | 76% | 24% | 11% | 24% | 27.3–31.8°C |
| August | 76% | 24% | 10% | 22% | 26.0–31.1°C |
| September | 63% | 24% | 10% | 24% | 21.6–26.3°C |
| October | 32% | 20% | 7% | 19% | 14.3–21.1°C |
| November | 4% | 17% | 5% | 13% | 3.8–11.2°C |
| December | 0% | 17% | 3% | 10% | -3.4–3.8°C |
A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.
The evidence behind this page
Nearby, measured,
and named.
- Place identity
- GeoNames 4847139
- NOAA station
- USC00132603 · ELKADER 6 SSW
- Station distance
- 18 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 29 usable years
- Daylight
- Calculated from latitude 42.75°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.