Climate averages 1991–2020
Asmara weather
in September.
A warm, fairly dry month: the 4th warmest and the 5th 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 Asmara: daytime highs average 23.4°C and nights cool to about 13.4°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 38 mm of rain on roughly 6 days, which makes September a fairly dry month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 14 min on an average September day.
The nearest other city in this atlas is Keren (71 km away). In September its highs average 27.9°C, 4.5°C warmer than Asmara, with 123 mm of rain.
Among the 2 cities listed in Eritrea, Asmara ranks 2nd of 2 for the warmest September highs and 1st of 2 for the driest September (rainfall, lowest first). The mean September high of those 2 cities is 25.7°C; Asmara is 2.3°C cooler than that mean.
From September to October, average highs fall by 1.4°C to 22.0°C, and monthly rainfall falls from 38 mm to 28 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
Asmara climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 20.5°C9.6°C | 9.6°C | 49 | 12.9 | 11.311 h |
| February | 22.0°C10.4°C | 10.4°C | 34 | 9.4 | 11.612 h |
| March | 23.3°C11.4°C | 11.4°C | 48 | 12.2 | 12.012 h |
| April | 23.8°C12.6°C | 12.6°C | 63 | 16.1 | 12.512 h |
| May | 24.5°C13.7°C | 13.7°C | 47 | 10.7 | 12.813 h |
| June | 25.3°C14.0°C | 14.0°C | 39 | 8.3 | 13.013 h |
| July | 22.5°C14.0°C | 14.0°C | 182 | 27.3 | 12.913 h |
| August | 22.1°C14.3°C | 14.3°C | 211 | 26.9 | 12.613 h |
| September, selected | 23.4°C13.4°C | 13.4°C | 38 | 6.1 | 12.212 h |
| October | 22.0°C11.9°C | 11.9°C | 28 | 5.7 | 11.812 h |
| November | 20.9°C10.8°C | 10.8°C | 32 | 8.4 | 11.411 h |
| December | 20.3°C10.1°C | 10.1°C | 36 | 10.9 | 11.211 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
- Keren in SeptemberEritrea · 71 kmHigh 27.9°C · Low 17.4°C · 123 mm rain
- Adwa in SeptemberEthiopia · 131 kmHigh 25.2°C · Low 12.9°C · 75 mm rain
- Ādīgrat in SeptemberEthiopia · 131 kmHigh 22.6°C · Low 12.8°C · 61 mm rain
- Aksum in SeptemberEthiopia · 137 kmHigh 23.9°C · Low 12.8°C · 87 mm rain
- Inda Silasē in SeptemberEthiopia · 154 kmHigh 24.6°C · Low 14.6°C · 253 mm rain
- Mek'ele in SeptemberEthiopia · 213 kmHigh 24.2°C · Low 13.9°C · 67 mm rain
- Kassala in SeptemberSudan · 272 kmHigh 36.2°C · Low 24.6°C · 24 mm rain
- Alamata in SeptemberEthiopia · 332 kmHigh 28.6°C · Low 15.6°C · 38 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 Asmara) is explained once on the Asmara year overview and on the Sources, method and limits page.