September
Other strong months: June and May
84/100 weather score
United States · 1991–2020
Best time to visit
Richmond Hill
For Richmond Hill, September has the most comfortable weather in our climate comparison. Typical daytime highs are 24.6°C, nights average 16.4°C, and rainfall totals about 91 mm. Figures use measured 1991–2020 normals from the nearest eligible NOAA station.
Best all-round monthSeptember
Typical daytime high24.6°C
Typical night-time low16.4°C
September rainfall91 mm
July
Other strong months: August and June
83/100 weather score
October
Other strong months: May and April
80/100 weather score
Make the answer personal
Choose the weather
that suits you.
Set the daytime temperature and rainfall you are comfortable with. We will show only the months that meet every choice, using the measured 1991–2020 averages below.
4 months fit your choices for Richmond Hill
The lowest comfort score is 5 out of 100. January, February and December share that score. In January, that is mainly because days reach only 4.4°C, 20° below the 24°C the score treats as ideal.
Quick answers
Planning a trip to Richmond Hill?
These answers come from the same measured monthly climate record shown on this page.
When is the best time to visit Richmond Hill?
September is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 24.6°C and 91 mm of rain.
What is the hottest month in Richmond Hill?
July is hottest in this record, with a typical daytime high of 28.9°C and a night-time low of 20.7°C.
Which month has the least rain?
February has the lowest monthly rainfall total at 70 mm.
Is this a weather forecast?
No. These are long-term measured averages from 1991–2020. Check a current forecast before you travel.
Month by month
See how the weather
changes through the year.
The bars combine daytime temperature, night-time temperature and rainfall. The figures are measured historical averages, not a forecast for a particular trip.
| Month | Day | Night | Rain | Wet days | Sea | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|---|
| January | 4.4°C | -2.9°C | 82 mm | 8 | 6.0°C | 9 h 33 | 5 | Strong coverage |
| February | 5.6°C | -2.2°C | 70 mm | 7.6 | 4.3°C | 10 h 35 | 5 | Strong coverage |
| March | 9.4°C | 1.3°C | 100 mm | 8.6 | 4.8°C | 11 h 49 | 13 | Strong coverage |
| April | 15.2°C | 6.3°C | 90 mm | 8.8 | 7.9°C | 13 h 14 | 42 | Strong coverage |
| May | 20.5°C | 11.7°C | 93 mm | 9 | 12.6°C | 14 h 25 | 69 | Strong coverage |
| June | 25.7°C | 17.1°C | 98 mm | 8 | 18.1°C | 15 h 04 | 77 | Strong coverage |
| July | 28.9°C | 20.7°C | 98 mm | 7.5 | 22.2°C | 14 h 49 | 61 | Strong coverage |
| August | 28.1°C | 20.2°C | 104 mm | 6.9 | 23.1°C | 13 h 47 | 64 | Strong coverage |
| September | 24.6°C | 16.4°C | 91 mm | 7.1 | 21.4°C | 12 h 25 | 84 | Strong coverage |
| October | 18.4°C | 10.2°C | 94 mm | 7.1 | 17.3°C | 11 h 03 | 61 | Strong coverage |
| November | 12.4°C | 4.7°C | 78 mm | 7 | 12.7°C | 9 h 51 | 33 | Strong coverage |
| December | 7.2°C | 0.3°C | 101 mm | 9.1 | 9.0°C | 9 h 16 | 5 | Strong coverage |
What has changed
Recent daytime highs are
1.2°C warmer in Richmond Hill.
Each bar shows the difference between the 2011–2025 average daytime high and the 1961–1990 average for the same month at the same station. A blank month does not have enough older observations for a reliable comparison.
Jan
+1.8
Feb
+2.0
Mar
+1.2
Apr
+0.9
May
+0.8
Jun
+0.9
Jul
+1.4
Aug
+0.6
Sep
+1.1
Oct
+1.2
Nov
+0.7
Dec
+2.0
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 21.7°C6 Jan 2007 | -18.9°C21 Jan 1985 | 96 mm3 Jan 1999 | 212 mm1979 · driest 0 mm in 1952 | 78 |
| February | 21.7°C27 Feb 1997 | -18.9°C8 Feb 1963 | 63 mm9 Feb 1969 | 153 mm2010 · driest 0 mm in 1956 | 78 |
| March | 29.4°C13 Mar 1990 | -13.9°C19 Mar 1967 | 80 mm23 Mar 2024 | 251 mm2024 · driest 0 mm in 1953 | 78 |
| April | 32.2°C12 Apr 1977 | -6.7°C7 Apr 1982 | 119 mm30 Apr 2014 | 242 mm1983 · driest 0 mm in 1952 | 78 |
| May | 37.2°C29 May 1969 | 1.1°C10 May 1966 | 73 mm29 May 1968 | 272 mm1989 · driest 0 mm in 1952 | 78 |
| June | 38.9°C24 Jun 2025 | 7.2°C1 Jun 1967 | 159 mm30 Jun 1984 | 235 mm2003 · driest 0 mm in 1952 | 78 |
| July | 40.0°C3 Jul 1966 | 12.8°C9 Jul 1963 | 89 mm31 Jul 1996 | 224 mm1996 · driest 0 mm in 1951 | 79 |
| August | 38.3°C27 Aug 1948 | 7.8°C31 Aug 1965 | 198 mm14 Aug 2011 | 438 mm2011 · driest 0 mm in 1955 | 78 |
| September | 36.7°C10 Sep 1983 | 4.4°C25 Sep 1950 | 205 mm29 Sep 2023 | 331 mm2023 · driest 0 mm in 1952 | 78 |
| October | 35.0°C2 Oct 2019 | -1.1°C28 Oct 1976 | 118 mm14 Oct 2005 | 380 mm2005 · driest 0 mm in 1952 | 78 |
| November | 27.8°C1 Nov 2024 | -9.3°C23 Nov 2018 | 100 mm8 Nov 1972 | 242 mm1972 · driest 0 mm in 1953 | 78 |
| December | 23.9°C7 Dec 1998 | -16.7°C25 Dec 1983 | 77 mm9 Dec 2014 | 204 mm2019 · driest 0 mm in 1958 | 78 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 22 | 3 | 5 |
| February | 0 | 0 | 20 | 2 | 4 |
| March | <1 | 0 | 12 | 3 | 3 |
| April | 1 | <1 | 1 | 3 | <1 |
| May | 6 | 1 | 0 | 3 | 0 |
| June | 18 | 5 | 0 | 3 | 0 |
| July | 28 | 12 | 0 | 3 | 0 |
| August | 28 | 8 | 0 | 3 | 0 |
| September | 15 | 2 | 0 | 3 | 0 |
| October | 2 | <1 | <1 | 3 | 0 |
| November | 0 | 0 | 4 | 3 | <1 |
| December | 0 | 0 | 16 | 4 | 3 |
| Month | Dry days reaching 20°C | Wet days | Days with heavy rain | Weeks with 3+ wet days | Typical high by year |
|---|---|---|---|---|---|
| January | <1% | 26% | 9% | 27% | 0.9–7.0°C |
| February | <1% | 28% | 9% | 32% | 1.8–8.0°C |
| March | 2% | 28% | 11% | 33% | 7.1–11.8°C |
| April | 14% | 29% | 10% | 37% | 13.0–16.5°C |
| May | 42% | 29% | 11% | 38% | 18.3–21.9°C |
| June | 70% | 27% | 9% | 28% | 23.8–26.9°C |
| July | 75% | 25% | 10% | 25% | 27.1–30.3°C |
| August | 77% | 23% | 9% | 22% | 26.4–29.2°C |
| September | 70% | 23% | 10% | 21% | 22.8–25.6°C |
| October | 32% | 21% | 8% | 18% | 16.6–20.3°C |
| November | 4% | 24% | 9% | 25% | 10.3–14.3°C |
| December | <1% | 29% | 10% | 34% | 3.7–9.5°C |
A dry day reaching 20°C records under 1 mm of rain. A wet day records at least 1 mm, while a heavy-rain day records at least 10 mm. The weekly figure is the share of seven-day periods containing three or more wet days. The final column shows the middle 80% of average daytime highs recorded for that month in individual years; a wider range means conditions have varied more from one year to another.
The evidence behind this page
Where these figures
come from.
- Place identity
- GeoNames 5133825
- NOAA station
- USW00094789 · JFK INTL AP
- Station distance
- 8.8 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 30 usable years
- Daylight
- Calculated from latitude 40.70°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Sea temperature
- NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 9 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.
Next step
Choose your month.
Then plan the details.
The weather comparison for Richmond Hill is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
How travel partnerships will work