September
September · June · August
77climate match
United States · 1991–2020
Best time to visit
Nelson.
September leads for comfortable weather in Nelson: typically 22.7°C by day, 12.6°C at night, with 105 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high22.7°C
Typical low12.6°C
Rain in September105 mm
July
July · August · June
68climate match
May
May · September · October
73climate match
The weakest month is January, scoring 5 against September’s 77 — days reach only -3.7°C, 28° 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
5-3.7° / -12.2°
Feb
5-1° / -10.2°
Mar
55.9° / -3.4°
Apr
3314° / 3.3°
May
6120.8° / 10°
Jun
7025.9° / 15.4°
Jul
6528° / 17.9°
Aug
6926.8° / 16.9°
Sep
7722.7° / 12.6°
Oct
4515.1° / 5.7°
Nov
86.3° / -1.4°
Dec
5-0.8° / -8.3°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -3.7°C | -12.2°C | 24 mm | 5.5 | 9 h 11 | 5 | Strong coverage |
| February | -1°C | -10.2°C | 26 mm | 4.4 | 10 h 22 | 5 | Strong coverage |
| March | 5.9°C | -3.4°C | 47 mm | 6.8 | 11 h 46 | 5 | Strong coverage |
| April | 14°C | 3.3°C | 89 mm | 9.2 | 13 h 24 | 33 | Strong coverage |
| May | 20.8°C | 10°C | 122 mm | 11.1 | 14 h 46 | 61 | Strong coverage |
| June | 25.9°C | 15.4°C | 144 mm | 11.1 | 15 h 31 | 70 | Strong coverage |
| July | 28°C | 17.9°C | 117 mm | 8.9 | 15 h 13 | 65 | Strong coverage |
| August | 26.8°C | 16.9°C | 127 mm | 9.2 | 14 h 02 | 69 | Strong coverage |
| September | 22.7°C | 12.6°C | 105 mm | 8 | 12 h 28 | 77 | Strong coverage |
| October | 15.1°C | 5.7°C | 66 mm | 8 | 10 h 54 | 45 | Strong coverage |
| November | 6.3°C | -1.4°C | 49 mm | 5.4 | 9 h 32 | 8 | Strong coverage |
| December | -0.8°C | -8.3°C | 28 mm | 5.5 | 8 h 51 | 5 | Strong coverage |
What has changed
Nelson runs +0.4°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
+1.4
Feb
-0.1
Mar
+1.3
Apr
-1.5
May
-0.5
Jun
+0.2
Jul
-0.3
Aug
-0.3
Sep
+1.7
Oct
0.0
Nov
+0.7
Dec
+2.3
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 12.8°C25 Jan 1981 | -38.9°C31 Jan 1996 | 38 mm4 Jan 1973 | 85 mm1967 · driest 2 mm in 2025 | 82 |
| February | 19.4°C27 Feb 2024 | -37.2°C3 Feb 1996 | 36 mm24 Feb 2019 | 123 mm2019 · driest 0 mm in 1970 | 82 |
| March | 26.7°C29 Mar 1986 | -32.8°C1 Mar 1962 | 43 mm23 Mar 1966 | 112 mm1951 · driest 4 mm in 1958 | 82 |
| April | 31.7°C21 Apr 1980 | -13.9°C4 Apr 1995 | 56 mm28 Apr 1975 | 207 mm1999 · driest 16 mm in 1943 | 81 |
| May | 34.4°C28 May 2018 | -4.4°C6 May 1989 | 85 mm28 May 1970 | 266 mm2004 · driest 20 mm in 2026 | 80 |
| June | 38.3°C11 Jun 1956 | 2.2°C17 Jun 2000 | 95 mm13 Jun 1990 | 277 mm1998 · driest 23 mm in 1964 | 81 |
| July | 37.8°C21 Jul 1983 | 6.1°C20 Jul 1970 | 162 mm20 Jul 2017 | 324 mm1978 · driest 17 mm in 1980 | 79 |
| August | 38.3°C7 Aug 2001 | 5.6°C21 Aug 2004 | 129 mm11 Aug 2016 | 292 mm2007 · driest 8 mm in 1971 | 80 |
| September | 36.7°C4 Sep 2023 | -3.9°C26 Sep 1984 | 131 mm23 Sep 2010 | 343 mm2010 · driest 6 mm in 1979 | 80 |
| October | 32.8°C3 Oct 1997 | -7.8°C26 Oct 1942 | 136 mm15 Oct 1966 | 169 mm2009 · driest 3 mm in 1952 | 81 |
| November | 25.6°C1 Nov 1950 | -23.3°C26 Nov 1977 | 66 mm10 Nov 1975 | 213 mm1991 · driest 0 mm in 1976 | 79 |
| December | 19.4°C16 Dec 2021 | -35.6°C24 Dec 1983 | 38 mm12 Dec 1965 | 84 mm2015 · driest 0 mm in 1989 | 81 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | <1 | 6 |
| February | 0 | 0 | 26 | <1 | 4 |
| March | <1 | 0 | 22 | 1 | 3 |
| April | 1 | <1 | 8 | 3 | <1 |
| May | 7 | 1 | <1 | 4 | 0 |
| June | 19 | 5 | 0 | 5 | 0 |
| July | 26 | 9 | 0 | 4 | 0 |
| August | 23 | 5 | 0 | 4 | 0 |
| September | 11 | 2 | <1 | 3 | 0 |
| October | 2 | <1 | 4 | 2 | <1 |
| November | 0 | 0 | 18 | 2 | 1 |
| December | 0 | 0 | 28 | <1 | 5 |
The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 81); on 2011–2025 it is September (90). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 16% | 1% | 12% | -7.8–-0.9°C |
| February | 0% | 14% | 1% | 9% | -4.8–3.1°C |
| March | 2% | 21% | 5% | 21% | 1.5–8.9°C |
| April | 16% | 29% | 9% | 35% | 10.4–16.8°C |
| May | 45% | 32% | 12% | 40% | 18.4–23.7°C |
| June | 63% | 34% | 14% | 42% | 24.2–27.9°C |
| July | 72% | 27% | 12% | 30% | 26.5–30.4°C |
| August | 70% | 29% | 11% | 33% | 25.1–29.0°C |
| September | 55% | 27% | 9% | 31% | 20.6–24.8°C |
| October | 21% | 22% | 6% | 22% | 12.8–18.3°C |
| November | 2% | 19% | 5% | 15% | 2.2–9.3°C |
| December | 0% | 16% | 2% | 12% | -4.7–2.1°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 5264270
- NOAA station
- USC00470124 · ALMA DAM 4
- Station distance
- 12.6 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 29 usable years
- Daylight
- Calculated from latitude 44.42°, 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.