Ribeira de Frades weather in September
In September, Ribeira de Frades sees average daytime highs of 25°C and overnight lows near 15°C, with 49 mm of rain across 6 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 9th-wettest month of the year here.
Highs ease over the month, from about 27°C in the first days to 24°C by the end. The sky is clear or mostly clear about 55% of the time in September, and the air most often feels comfortable.
Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Ribeira de Frades's 3rd-clearest and 12th-windiest month. For the whole year in context, see Ribeira de Frades's year-round climate.
- Daytime high
- 25°
- 3rd warmest
- Overnight low
- 15°
- 10th coldest
- Rainfall
- 49 mm
- 6 wet days
- Daylight
- 12 h 18 min
- 6:20 AM – 6:36 PM
- Cloud cover
- 39%
- 3rd clearest
- Wind
- 9 km/h
- 12th windiest
- Solar energy
- 4.97 kWh/m²
- Travel score
- 7.7
- out of 10
Temperature in September
Highs ease over the month, from about 27°C in the first days to 24°C by the end.
A typical September day in Ribeira de Frades reaches about 25°C in the afternoon and slips back to 15°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 31°C. Set against its neighbours, September runs about 2°C cooler than August and about 4°C warmer than October.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 |
| Avg low (°C) | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 27 | 15 |
| 2 | 27 | 15 |
| 3 | 27 | 15 |
| 4 | 27 | 15 |
| 5 | 27 | 15 |
| 6 | 27 | 15 |
| 7 | 27 | 15 |
| 8 | 26 | 15 |
| 9 | 26 | 15 |
| 10 | 26 | 15 |
| 11 | 26 | 15 |
| 12 | 26 | 15 |
| 13 | 26 | 15 |
| 14 | 26 | 15 |
| 15 | 26 | 15 |
| 16 | 25 | 14 |
| 17 | 25 | 14 |
| 18 | 25 | 14 |
| 19 | 25 | 14 |
| 20 | 25 | 14 |
| 21 | 25 | 14 |
| 22 | 25 | 14 |
| 23 | 24 | 14 |
| 24 | 24 | 14 |
| 25 | 24 | 14 |
| 26 | 24 | 14 |
| 27 | 24 | 14 |
| 28 | 24 | 14 |
| 29 | 24 | 14 |
| 30 | 24 | 14 |
Ribeira de Frades weather by month
How September compares with the rest of the year at a glance. September is the 3rd-warmest and 9th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 14° / 6° | 108 | 10.8 | 9.5 | 3.9 |
| Feb | 15° / 6° | 80 | 8.6 | 10.4 | 4.7 |
| Mar | 18° / 8° | 85 | 9.6 | 11.7 | 5.9 |
| Apr | 19° / 10° | 92 | 10.7 | 13 | 6.1 |
| May | 22° / 12° | 73 | 9.2 | 14.2 | 6.9 |
| Jun | 25° / 14° | 23 | 5.1 | 14.8 | 7.9 |
| Jul | 27° / 16° | 9 | 2.2 | 14.6 | 8.2 |
| Aug | 28° / 16° | 14 | 3.1 | 13.6 | 7.8 |
| Sep | 25° / 15° | 49 | 6 | 12.3 | 7.7 |
| Oct | 21° / 12° | 117 | 11.2 | 10.9 | 6.4 |
| Nov | 17° / 9° | 117 | 11.9 | 9.8 | 5.1 |
| Dec | 14° / 7° | 111 | 10.9 | 9.2 | 4.1 |
Cloud cover in September
The sky is clear or mostly clear about 55% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 28%. Skies tend to cloud over as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 82 | 82 | 81 | 81 | 80 | 79 | 78 | 77 | 76 | 76 | 74 | 74 | 73 | 72 | 71 | 71 | 70 | 69 | 68 | 68 | 67 | 67 | 66 | 66 | 65 | 65 | 64 | 64 | 63 | 63 |
| Cloudier (%) | 18 | 18 | 19 | 19 | 20 | 21 | 22 | 23 | 24 | 24 | 26 | 26 | 27 | 28 | 29 | 29 | 30 | 31 | 32 | 32 | 33 | 33 | 34 | 34 | 35 | 35 | 36 | 36 | 37 | 37 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 82 | 18 |
| 2 | 82 | 18 |
| 3 | 81 | 19 |
| 4 | 81 | 19 |
| 5 | 80 | 20 |
| 6 | 79 | 21 |
| 7 | 78 | 22 |
| 8 | 77 | 23 |
| 9 | 76 | 24 |
| 10 | 76 | 24 |
| 11 | 74 | 26 |
| 12 | 74 | 26 |
| 13 | 73 | 27 |
| 14 | 72 | 28 |
| 15 | 71 | 29 |
| 16 | 71 | 29 |
| 17 | 70 | 30 |
| 18 | 69 | 31 |
| 19 | 68 | 32 |
| 20 | 68 | 32 |
| 21 | 67 | 33 |
| 22 | 67 | 33 |
| 23 | 66 | 34 |
| 24 | 66 | 34 |
| 25 | 65 | 35 |
| 26 | 65 | 35 |
| 27 | 64 | 36 |
| 28 | 64 | 36 |
| 29 | 63 | 37 |
| 30 | 63 | 37 |
Chance of precipitation in September
Ribeira de Frades gets around 49 mm of rain over 6 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 20% and peaks near 26% on the wettest days. The odds climb toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 12 | 13 | 13 | 13 | 13 | 14 | 14 | 15 | 16 | 17 | 18 | 18 | 19 | 20 | 21 | 22 | 22 | 23 | 23 | 24 | 24 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 |
| Rain chance (%) | |
|---|---|
| 1 | 12 |
| 2 | 13 |
| 3 | 13 |
| 4 | 13 |
| 5 | 13 |
| 6 | 14 |
| 7 | 14 |
| 8 | 15 |
| 9 | 16 |
| 10 | 17 |
| 11 | 18 |
| 12 | 18 |
| 13 | 19 |
| 14 | 20 |
| 15 | 21 |
| 16 | 22 |
| 17 | 22 |
| 18 | 23 |
| 19 | 23 |
| 20 | 24 |
| 21 | 24 |
| 22 | 25 |
| 23 | 25 |
| 24 | 25 |
| 25 | 25 |
| 26 | 25 |
| 27 | 25 |
| 28 | 25 |
| 29 | 25 |
| 30 | 26 |
Humidity in September
Most of September feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the comfortable band about 43% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 21 | 22 | 22 | 23 | 24 | 25 | 25 | 26 | 27 | 27 | 28 | 28 | 29 | 30 | 31 | 31 | 32 | 33 | 34 | 35 | 36 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 45 |
| Comfortable (%) | 45 | 44 | 44 | 44 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 45 | 44 | 44 | 44 | 44 | 43 | 43 | 42 | 41 | 41 | 40 | 40 | 39 | 38 | 37 | 37 |
| Humid (%) | 34 | 33 | 33 | 32 | 31 | 30 | 29 | 28 | 28 | 27 | 26 | 26 | 25 | 25 | 24 | 24 | 23 | 23 | 22 | 22 | 22 | 21 | 21 | 21 | 20 | 20 | 19 | 19 | 18 | 18 |
| Muggy (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| 1 | 21 | 45 | 34 | 1 |
| 2 | 22 | 44 | 33 | 1 |
| 3 | 22 | 44 | 33 | 1 |
| 4 | 23 | 44 | 32 | 1 |
| 5 | 24 | 45 | 31 | 1 |
| 6 | 25 | 45 | 30 | 1 |
| 7 | 25 | 45 | 29 | 1 |
| 8 | 26 | 45 | 28 | 1 |
| 9 | 27 | 45 | 28 | 1 |
| 10 | 27 | 45 | 27 | 1 |
| 11 | 28 | 45 | 26 | 1 |
| 12 | 28 | 45 | 26 | 1 |
| 13 | 29 | 45 | 25 | 0 |
| 14 | 30 | 45 | 25 | 0 |
| 15 | 31 | 45 | 24 | 0 |
| 16 | 31 | 44 | 24 | 0 |
| 17 | 32 | 44 | 23 | 0 |
| 18 | 33 | 44 | 23 | 0 |
| 19 | 34 | 44 | 22 | 0 |
| 20 | 35 | 43 | 22 | 0 |
| 21 | 36 | 43 | 22 | 0 |
| 22 | 36 | 42 | 21 | 0 |
| 23 | 37 | 41 | 21 | 0 |
| 24 | 38 | 41 | 21 | 0 |
| 25 | 39 | 40 | 20 | 0 |
| 26 | 40 | 40 | 20 | 1 |
| 27 | 41 | 39 | 19 | 1 |
| 28 | 42 | 38 | 19 | 1 |
| 29 | 43 | 37 | 18 | 1 |
| 30 | 45 | 37 | 18 | 1 |
Wind in September
Winds average 9 km/h in September, the calmest month.
Across September, daily wind ranges from about 9 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 9 | calm |
| 2 | 9 | calm |
| 3 | 9 | calm |
| 4 | 9 | calm |
| 5 | 9 | calm |
| 6 | 9 | calm |
| 7 | 9 | calm |
| 8 | 9 | calm |
| 9 | 9 | calm |
| 10 | 9 | calm |
| 11 | 9 | calm |
| 12 | 9 | calm |
| 13 | 9 | calm |
| 14 | 9 | calm |
| 15 | 9 | calm |
| 16 | 9 | calm |
| 17 | 9 | calm |
| 18 | 9 | calm |
| 19 | 9 | calm |
| 20 | 9 | calm |
| 21 | 9 | calm |
| 22 | 9 | calm |
| 23 | 9 | calm |
| 24 | 9 | calm |
| 25 | 9 | calm |
| 26 | 9 | calm |
| 27 | 9 | calm |
| 28 | 9 | calm |
| 29 | 9 | calm |
| 30 | 9 | calm |
Sunrise & sunset in September
Daylight runs from about 12 h 54 min at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 78 minutes over September. Sunrise moves from 6:06 AM to 6:34 AM, and sunset from 7:02 PM to 6:12 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.9 | 12.9 | 12.8 | 12.8 | 12.8 | 12.7 | 12.7 | 12.6 | 12.6 | 12.5 | 12.5 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.2 | 12.2 | 12.1 | 12.1 | 12.0 | 12.0 | 11.9 | 11.9 | 11.9 | 11.8 | 11.8 | 11.7 | 11.7 | 11.6 |
| Sunrise (AM) | 6:06 | 6:07 | 6:08 | 6:09 | 6:10 | 6:11 | 6:12 | 6:13 | 6:14 | 6:14 | 6:15 | 6:16 | 6:17 | 6:18 | 6:19 | 6:20 | 6:21 | 6:22 | 6:23 | 6:24 | 6:25 | 6:26 | 6:27 | 6:28 | 6:29 | 6:30 | 6:31 | 6:32 | 6:33 | 6:34 |
| Sunset (PM) | 7:02 | 7:00 | 6:58 | 6:57 | 6:55 | 6:53 | 6:52 | 6:50 | 6:48 | 6:46 | 6:45 | 6:43 | 6:41 | 6:40 | 6:38 | 6:36 | 6:34 | 6:33 | 6:31 | 6:29 | 6:27 | 6:26 | 6:24 | 6:22 | 6:21 | 6:19 | 6:17 | 6:15 | 6:14 | 6:12 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.9 | 6:06 | 7:02 |
| 2 | 12.9 | 6:07 | 7:00 |
| 3 | 12.8 | 6:08 | 6:58 |
| 4 | 12.8 | 6:09 | 6:57 |
| 5 | 12.8 | 6:10 | 6:55 |
| 6 | 12.7 | 6:11 | 6:53 |
| 7 | 12.7 | 6:12 | 6:52 |
| 8 | 12.6 | 6:13 | 6:50 |
| 9 | 12.6 | 6:14 | 6:48 |
| 10 | 12.5 | 6:14 | 6:46 |
| 11 | 12.5 | 6:15 | 6:45 |
| 12 | 12.4 | 6:16 | 6:43 |
| 13 | 12.4 | 6:17 | 6:41 |
| 14 | 12.4 | 6:18 | 6:40 |
| 15 | 12.3 | 6:19 | 6:38 |
| 16 | 12.3 | 6:20 | 6:36 |
| 17 | 12.2 | 6:21 | 6:34 |
| 18 | 12.2 | 6:22 | 6:33 |
| 19 | 12.1 | 6:23 | 6:31 |
| 20 | 12.1 | 6:24 | 6:29 |
| 21 | 12.0 | 6:25 | 6:27 |
| 22 | 12.0 | 6:26 | 6:26 |
| 23 | 11.9 | 6:27 | 6:24 |
| 24 | 11.9 | 6:28 | 6:22 |
| 25 | 11.9 | 6:29 | 6:21 |
| 26 | 11.8 | 6:30 | 6:19 |
| 27 | 11.8 | 6:31 | 6:17 |
| 28 | 11.7 | 6:32 | 6:15 |
| 29 | 11.7 | 6:33 | 6:14 |
| 30 | 11.6 | 6:34 | 6:12 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 4.97 kWh/m².
For context, solar energy here swings from a low near 1.81 kWh/m² to a high of 7.28 kWh/m² in July across the year — September's 4.97 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.8 | 5.7 | 5.7 | 5.6 | 5.6 | 5.5 | 5.5 | 5.4 | 5.3 | 5.3 | 5.2 | 5.2 | 5.1 | 5.0 | 5.0 | 4.9 | 4.9 | 4.8 | 4.8 | 4.7 | 4.7 | 4.6 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.3 | 4.3 | 4.2 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.8 | Bright |
| 2 | 5.7 | Bright |
| 3 | 5.7 | Bright |
| 4 | 5.6 | Bright |
| 5 | 5.6 | Bright |
| 6 | 5.5 | Bright |
| 7 | 5.5 | Bright |
| 8 | 5.4 | Bright |
| 9 | 5.3 | Bright |
| 10 | 5.3 | Bright |
| 11 | 5.2 | Bright |
| 12 | 5.2 | Bright |
| 13 | 5.1 | Bright |
| 14 | 5.0 | Bright |
| 15 | 5.0 | Bright |
| 16 | 4.9 | Bright |
| 17 | 4.9 | Bright |
| 18 | 4.8 | Bright |
| 19 | 4.8 | Bright |
| 20 | 4.7 | Bright |
| 21 | 4.7 | Bright |
| 22 | 4.6 | Bright |
| 23 | 4.5 | Bright |
| 24 | 4.5 | Bright |
| 25 | 4.5 | Bright |
| 26 | 4.4 | Bright |
| 27 | 4.4 | Bright |
| 28 | 4.3 | Bright |
| 29 | 4.3 | Bright |
| 30 | 4.2 | Bright |
Hazard calendar for Ribeira de Frades
None of Ribeira de Frades's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Ribeira de Frades's rainy season runs October–May, when most of the year's rain falls.
Is September a good time to visit Ribeira de Frades?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is one of the better times to visit Ribeira de Frades for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Ribeira de Frades in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Ribeira de Frades sees daytime highs around 25°C and nights near 15°C. Worth packing: light clothes and sun protection. About 6 days see rain.
Sea temperature near Ribeira de Frades in September
The nearest coast averages about 18°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 35 km away) is warmest in August at about 18°C and coldest in February near 14°C.
The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 14 | 14 | 14 | 15 | 16 | 18 | 18 | 18 | 18 | 17 | 16 | 15 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Cool | Cool | Cool | Cool | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 14 | Bracing |
| Feb | 14 | Bracing |
| Mar | 14 | Bracing |
| Apr | 15 | Bracing |
| May | 16 | Cool |
| Jun | 18 | Cool |
| Jul | 18 | Cool |
| Aug | 18 | Cool |
| Sep | 18 | Cool |
| Oct | 17 | Cool |
| Nov | 16 | Cool |
| Dec | 15 | Bracing |
UV index in Ribeira de Frades in September
Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Ribeira de Frades peaks around July 14 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 7 | 7 | 9 | 9 | 8 | 6 | 5 | 2 | 2 |
| Level | Low | Moderate | High | High | High | Very high | Very high | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | High |
| Apr | 7 | High |
| May | 7 | High |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 8 | Very high |
| Sep | 6 | High |
| Oct | 5 | Moderate |
| Nov | 2 | Moderate |
| Dec | 2 | Low |
Air quality in Ribeira de Frades in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.
Air quality in Ribeira de Frades is worst in October — around 29 µg/m³ PM2.5 (moderate), about 3.9× the cleanest month (November, 7 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 9 | 10 | 13 | 11 | 8 | 21 | 9 | 24 | 23 | 29 | 7 | 7 |
| Level | Good | Good | Moderate | Good | Good | Moderate | Good | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 9 | Good |
| Feb | 10 | Good |
| Mar | 13 | Moderate |
| Apr | 11 | Good |
| May | 8 | Good |
| Jun | 21 | Moderate |
| Jul | 9 | Good |
| Aug | 24 | Moderate |
| Sep | 23 | Moderate |
| Oct | 29 | Moderate |
| Nov | 7 | Good |
| Dec | 7 | Good |
Where is Ribeira de Frades?
Ribeira de Frades sits at 40.2°N, 8.5°W, 27 m above sea level, in Portugal. The nearest listed city is São Martinho do Bispo, 2.0 km away.
Topography around Ribeira de Frades
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Ribeira de Frades.
Within 3 km, the terrain around Ribeira de Frades has only modest variations in elevation — a maximum elevation change of 170 m around an average of 47 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 534 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,993 m.
The land around Ribeira de Frades is covered by trees (38%) and cropland (25%) within 3 km, trees (66%) within 16 km, and trees (55%), grassland (20%) and water (20%) within 80 km.
Portugal travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / E / F
- 230 V · 50 Hz
- Prices
- ≈ 60% of US
- price level, 2025
- GDP per capita
- $32,082
- 2025
- Happiness
- 6.0 / 10
- World Happiness, 2025
- Safe drinking water
- 95%
- of population, 2024
- Homicide rate
- 0.7
- per 100k, 2022
- Road deaths
- 8.2
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Very high
- EF EPI 612
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Ribeira de Frades (40.205°, -8.4793°, elevation 27 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).