Climate averages 1991–2020
Orkney weather
in September.
A warm, fairly dry month: the 7th warmest and the 4th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Orkney: daytime highs average 26.6°C and nights cool to about 10.1°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 15 mm of rain on roughly 3 days, which makes September a fairly dry month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 55 min on an average September day.
The nearest other city in this atlas is Klerksdorp (14 km away). In September its highs average 26.6°C, about as warm as Orkney, with 14 mm of rain.
Among the 95 cities listed in South Africa, Orkney ranks joint 12th of 95 for the warmest September highs and joint 20th of 95 for the driest September (rainfall, lowest first). The mean September high of those 95 cities is 24.3°C; Orkney is 2.3°C warmer than that mean.
From September to October, average highs rise by 1.7°C to 28.3°C, and monthly rainfall rises from 15 mm to 60 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Orkney climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.0°C17.2°C | 17.2°C | 97 | 14.4 | 13.614 h |
| February | 28.3°C16.7°C | 16.7°C | 77 | 12.4 | 13.013 h |
| March | 26.9°C14.9°C | 14.9°C | 68 | 10.8 | 12.312 h |
| April | 24.0°C11.3°C | 11.3°C | 40 | 6.9 | 11.511 h |
| May | 21.5°C7.0°C | 7.0°C | 19 | 3.1 | 10.811 h |
| June | 18.6°C3.5°C | 3.5°C | 9.9 | 1.5 | 10.510 h |
| July | 18.8°C2.9°C | 2.9°C | 4.6 | 0.9 | 10.611 h |
| August | 22.1°C5.7°C | 5.7°C | 12 | 1.7 | 11.211 h |
| September, selected | 26.6°C10.1°C | 10.1°C | 15 | 3.0 | 11.912 h |
| October | 28.3°C13.2°C | 13.2°C | 60 | 9.4 | 12.713 h |
| November | 28.7°C14.8°C | 14.8°C | 73 | 11.2 | 13.413 h |
| December | 29.1°C16.6°C | 16.6°C | 98 | 14.8 | 13.814 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Klerksdorp in SeptemberSouth Africa · 14 kmHigh 26.6°C · Low 10.3°C · 14 mm rain
- Stilfontein in SeptemberSouth Africa · 18 kmHigh 26.4°C · Low 10.2°C · 14 mm rain
- Bothaville in SeptemberSouth Africa · 46 kmHigh 26.5°C · Low 10.0°C · 14 mm rain
- Potchefstroom in SeptemberSouth Africa · 52 kmHigh 26.5°C · Low 10.9°C · 16 mm rain
- Parys in SeptemberSouth Africa · 78 kmHigh 26.0°C · Low 10.4°C · 19 mm rain
- Kroonstad in SeptemberSouth Africa · 93 kmHigh 25.3°C · Low 9.5°C · 14 mm rain
- Kutloanong in SeptemberSouth Africa · 95 kmHigh 25.7°C · Low 9.4°C · 14 mm rain
- Odendaalsrus in SeptemberSouth Africa · 99 kmHigh 25.6°C · Low 9.4°C · 14 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Orkney) is explained once on the Orkney year overview and on the Sources, method and limits page.