September
September · June · August
85climate match
United States · 1991–2020
Best time to visit
Smithfield.
September leads for comfortable weather in Smithfield: typically 25.6°C by day, 10.7°C at night, with 41 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high25.6°C
Typical low10.7°C
Rain in September41 mm
August
August · July · June
78climate match
October
October · September · May
81climate match
The weakest month is January, scoring 5 against September’s 85 — days reach only 3.3°C, 21° below the 24°C the score treats as ideal, and nights drop to -9.9°C.
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
53.3° / -9.9°
Feb
55.2° / -8.3°
Mar
2511.4° / -3.2°
Apr
4616.5° / 2.2°
May
6822° / 8.5°
Jun
7427.8° / 14.7°
Jul
6430.2° / 17.4°
Aug
7429.1° / 16.2°
Sep
8525.6° / 10.7°
Oct
5818.4° / 3.1°
Nov
2310.7° / -3.5°
Dec
54.3° / -8.4°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 3.3°C | -9.9°C | 9 mm | 1.7 | 9 h 34 | 5 | Strong coverage |
| February | 5.2°C | -8.3°C | 13 mm | 2.3 | 10 h 35 | 5 | Strong coverage |
| March | 11.4°C | -3.2°C | 28 mm | 3.8 | 11 h 49 | 25 | Strong coverage |
| April | 16.5°C | 2.2°C | 61 mm | 5.8 | 13 h 14 | 46 | Strong coverage |
| May | 22°C | 8.5°C | 93 mm | 8.9 | 14 h 25 | 68 | Strong coverage |
| June | 27.8°C | 14.7°C | 93 mm | 8 | 15 h 03 | 74 | Strong coverage |
| July | 30.2°C | 17.4°C | 85 mm | 7.2 | 14 h 48 | 64 | Strong coverage |
| August | 29.1°C | 16.2°C | 70 mm | 5.2 | 13 h 47 | 74 | Strong coverage |
| September | 25.6°C | 10.7°C | 41 mm | 4.2 | 12 h 25 | 85 | Strong coverage |
| October | 18.4°C | 3.1°C | 40 mm | 4.3 | 11 h 03 | 58 | Strong coverage |
| November | 10.7°C | -3.5°C | 18 mm | 2.3 | 9 h 52 | 23 | Strong coverage |
| December | 4.3°C | -8.4°C | 11 mm | 1.6 | 9 h 17 | 5 | Strong coverage |
What has changed
Smithfield runs +0.8°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
+1.5
Feb
+0.3
Mar
+2.6
Apr
-0.5
May
-0.5
Jun
+0.8
Jul
-1.0
Aug
-0.5
Sep
+1.7
Oct
+0.3
Nov
+2.0
Dec
+2.4
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 23.9°C11 Jan 1990 | -30.0°C6 Jan 2004 | 23 mm17 Jan 1996 | 38 mm1992 · driest 0 mm in 2015 | 63 |
| February | 26.1°C28 Feb 1972 | -31.7°C21 Feb 2025 | 33 mm29 Feb 2004 | 48 mm2004 · driest 0 mm in 1976 | 63 |
| March | 35.6°C22 Mar 2026 | -27.2°C4 Mar 2019 | 47 mm12 Mar 1977 | 112 mm1977 · driest 0 mm in 1967 | 63 |
| April | 33.9°C19 Apr 1994 | -12.8°C7 Apr 2018 | 76 mm17 Apr 2016 | 159 mm2016 · driest 0 mm in 1989 | 64 |
| May | 38.3°C15 May 2013 | -5.0°C1 May 1989 | 94 mm23 May 1991 | 247 mm2008 · driest 5 mm in 1966 | 65 |
| June | 41.7°C14 Jun 2022 | 2.2°C2 Jun 1969 | 129 mm25 Jun 1989 | 224 mm1967 · driest 6 mm in 2021 | 65 |
| July | 41.7°C23 Jul 1964 | 7.2°C30 Jul 1971 | 125 mm9 Jul 2019 | 220 mm1993 · driest 4 mm in 2002 | 63 |
| August | 40.6°C17 Aug 1983 | 5.6°C27 Aug 1992 | 119 mm28 Aug 1989 | 150 mm2007 · driest 8 mm in 2020 | 63 |
| September | 39.4°C1 Sep 1984 | -4.4°C29 Sep 1984 | 76 mm18 Sep 1969 | 140 mm1965 · driest 0 mm in 1984 | 63 |
| October | 35.0°C1 Oct 2019 | -15.0°C31 Oct 2019 | 84 mm17 Oct 1965 | 157 mm2008 · driest 0 mm in 1975 | 63 |
| November | 28.9°C15 Nov 2025 | -24.4°C26 Nov 1975 | 47 mm18 Nov 2015 | 80 mm2015 · driest 0 mm in 1965 | 63 |
| December | 25.0°C23 Dec 1964 | -32.8°C22 Dec 1983 | 36 mm30 Dec 2006 | 84 mm2006 · driest 0 mm in 2001 | 63 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | <1 | 2 |
| February | <1 | 0 | 26 | <1 | 2 |
| March | 1 | <1 | 23 | <1 | 1 |
| April | 4 | <1 | 10 | 2 | <1 |
| May | 11 | 4 | <1 | 3 | 0 |
| June | 22 | 11 | 0 | 3 | 0 |
| July | 28 | 17 | 0 | 3 | 0 |
| August | 27 | 14 | 0 | 2 | 0 |
| September | 18 | 7 | <1 | 1 | 0 |
| October | 6 | 2 | 8 | 1 | <1 |
| November | <1 | 0 | 24 | <1 | <1 |
| December | 0 | 0 | 30 | <1 | 1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 6% | <1% | <1% | -1.1–6.9°C |
| February | 4% | 7% | 1% | 3% | -0.4–9.9°C |
| March | 16% | 12% | 3% | 8% | 6.2–14.6°C |
| April | 32% | 18% | 6% | 14% | 13.6–19.3°C |
| May | 53% | 26% | 10% | 28% | 19.9–25.1°C |
| June | 72% | 25% | 10% | 23% | 25.7–30.7°C |
| July | 77% | 22% | 9% | 21% | 28.7–32.8°C |
| August | 81% | 18% | 7% | 12% | 27.5–31.5°C |
| September | 74% | 16% | 5% | 12% | 22.8–28.1°C |
| October | 44% | 12% | 4% | 8% | 16.0–21.1°C |
| November | 13% | 8% | 2% | 2% | 7.0–13.8°C |
| December | 2% | 6% | <1% | 3% | 0.2–7.9°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 5079088
- NOAA station
- USC00251450 · CANADAY STEAM PLT
- Station distance
- 14 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 27 usable years
- Daylight
- Calculated from latitude 40.57°, 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.