Climate averages 1991–2020
Stanley weather
in September.
A cold, fairly dry month: the 9th warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a cold month in Stanley: daytime highs average 6.5°C and nights cool to about 2.3°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 37 mm of rain on roughly 10 days, which makes September a fairly dry month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 11 h 39 min on an average September day.
The nearest other city in this atlas is Río Gallegos (785 km away). In September its highs average 10.0°C, 3.5°C warmer than Stanley, with 21 mm of rain.
From September to October, average highs rise by 2.1°C to 8.6°C, and monthly rainfall rises from 37 mm to 41 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
Stanley climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 13.4°C7.9°C | 7.9°C | 62 | 13.1 | 16.116 h |
| February | 13.0°C7.8°C | 7.8°C | 53 | 12.0 | 14.514 h |
| March | 11.8°C7.0°C | 7.0°C | 55 | 12.1 | 12.513 h |
| April | 9.3°C5.3°C | 5.3°C | 51 | 12.5 | 10.511 h |
| May | 6.9°C3.6°C | 3.6°C | 48 | 12.0 | 8.89 h |
| June | 5.0°C1.9°C | 1.9°C | 47 | 12.3 | 7.98 h |
| July | 4.5°C1.3°C | 1.3°C | 49 | 12.3 | 8.38 h |
| August | 5.4°C1.8°C | 1.8°C | 39 | 10.3 | 9.810 h |
| September, selected | 6.5°C2.3°C | 2.3°C | 37 | 9.9 | 11.712 h |
| October | 8.6°C3.7°C | 3.7°C | 41 | 10.1 | 13.714 h |
| November | 10.6°C5.3°C | 5.3°C | 50 | 11.5 | 15.516 h |
| December | 12.0°C6.7°C | 6.7°C | 66 | 14.2 | 16.617 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
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 Stanley) is explained once on the Stanley year overview and on the Sources, method and limits page.