Leiria weather in September
In September, Leiria sees average daytime highs of 25°C and overnight lows near 14°C, with 41 mm of rain across 5.6 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 26°C in the first days to 23°C by the end. The sky is clear or mostly clear about 57% 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 Leiria's 3rd-clearest and 12th-windiest month. For the whole year in context, see Leiria's year-round climate.
- Daytime high
- 25°
- 3rd warmest
- Overnight low
- 14°
- 10th coldest
- Rainfall
- 41 mm
- 5.6 wet days
- Daylight
- 12 h 18 min
- 6:22 AM – 6:37 PM
- Cloud cover
- 38%
- 3rd clearest
- Wind
- 12 km/h
- 12th windiest
- Solar energy
- 5.14 kWh/m²
- Travel score
- 8.0
- out of 10
Leiria is city seat of Leiria municipality.
- Air quality
- Moderate
- PM2.5 11.8 µg/m³ · 2010
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Highs ease over the month, from about 26°C in the first days to 23°C by the end.
A typical September day in Leiria reaches about 25°C in the afternoon and slips back to 14°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 21°C and 29°C. Set against its neighbours, September runs about 2°C cooler than August and about 3°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) | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 23 |
| Avg low (°C) | 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 | 14 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 26 | 15 |
| 2 | 26 | 15 |
| 3 | 26 | 15 |
| 4 | 26 | 15 |
| 5 | 26 | 15 |
| 6 | 26 | 15 |
| 7 | 25 | 15 |
| 8 | 25 | 15 |
| 9 | 25 | 15 |
| 10 | 25 | 15 |
| 11 | 25 | 15 |
| 12 | 25 | 15 |
| 13 | 25 | 15 |
| 14 | 25 | 15 |
| 15 | 25 | 14 |
| 16 | 24 | 14 |
| 17 | 24 | 14 |
| 18 | 24 | 14 |
| 19 | 24 | 14 |
| 20 | 24 | 14 |
| 21 | 24 | 14 |
| 22 | 24 | 14 |
| 23 | 24 | 14 |
| 24 | 24 | 14 |
| 25 | 24 | 14 |
| 26 | 23 | 14 |
| 27 | 23 | 14 |
| 28 | 23 | 14 |
| 29 | 23 | 14 |
| 30 | 23 | 14 |
Leiria 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° | 88 | 10.5 | 9.5 | 3.9 |
| Feb | 15° / 7° | 66 | 8.6 | 10.4 | 4.6 |
| Mar | 17° / 9° | 70 | 9.6 | 11.7 | 5.8 |
| Apr | 19° / 10° | 73 | 10.5 | 13 | 6.0 |
| May | 21° / 12° | 63 | 8.7 | 14.2 | 6.9 |
| Jun | 24° / 14° | 18 | 3.8 | 14.8 | 8.3 |
| Jul | 26° / 15° | 6 | 1.8 | 14.5 | 8.7 |
| Aug | 26° / 15° | 10 | 2.1 | 13.6 | 8.5 |
| Sep | 25° / 14° | 41 | 5.6 | 12.3 | 8.0 |
| Oct | 21° / 13° | 96 | 10.4 | 10.9 | 6.5 |
| Nov | 17° / 9° | 98 | 11.6 | 9.8 | 5.2 |
| Dec | 14° / 7° | 92 | 10.4 | 9.2 | 4.2 |
Cloud cover in September
The sky is clear or mostly clear about 57% 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 27%. 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 (%) | 84 | 84 | 82 | 82 | 82 | 80 | 79 | 79 | 78 | 78 | 76 | 76 | 75 | 75 | 74 | 73 | 72 | 71 | 71 | 70 | 70 | 69 | 68 | 68 | 66 | 66 | 65 | 64 | 64 | 63 |
| Cloudier (%) | 16 | 16 | 18 | 18 | 18 | 20 | 21 | 21 | 22 | 22 | 24 | 24 | 25 | 25 | 26 | 27 | 28 | 29 | 29 | 30 | 30 | 31 | 32 | 32 | 34 | 34 | 35 | 36 | 36 | 37 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 84 | 16 |
| 2 | 84 | 16 |
| 3 | 82 | 18 |
| 4 | 82 | 18 |
| 5 | 82 | 18 |
| 6 | 80 | 20 |
| 7 | 79 | 21 |
| 8 | 79 | 21 |
| 9 | 78 | 22 |
| 10 | 78 | 22 |
| 11 | 76 | 24 |
| 12 | 76 | 24 |
| 13 | 75 | 25 |
| 14 | 75 | 25 |
| 15 | 74 | 26 |
| 16 | 73 | 27 |
| 17 | 72 | 28 |
| 18 | 71 | 29 |
| 19 | 71 | 29 |
| 20 | 70 | 30 |
| 21 | 70 | 30 |
| 22 | 69 | 31 |
| 23 | 68 | 32 |
| 24 | 68 | 32 |
| 25 | 66 | 34 |
| 26 | 66 | 34 |
| 27 | 65 | 35 |
| 28 | 64 | 36 |
| 29 | 64 | 36 |
| 30 | 63 | 37 |
Chance of precipitation in September
Leiria gets around 41 mm of rain over 5.6 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 18% and peaks near 24% 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 (%) | 10 | 10 | 11 | 11 | 12 | 12 | 13 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 19 | 20 | 21 | 21 | 22 | 22 | 23 | 23 | 23 | 24 | 24 | 24 | 23 | 23 | 23 | 23 |
| Rain chance (%) | |
|---|---|
| 1 | 10 |
| 2 | 10 |
| 3 | 11 |
| 4 | 11 |
| 5 | 12 |
| 6 | 12 |
| 7 | 13 |
| 8 | 13 |
| 9 | 14 |
| 10 | 15 |
| 11 | 16 |
| 12 | 17 |
| 13 | 18 |
| 14 | 19 |
| 15 | 19 |
| 16 | 20 |
| 17 | 21 |
| 18 | 21 |
| 19 | 22 |
| 20 | 22 |
| 21 | 23 |
| 22 | 23 |
| 23 | 23 |
| 24 | 24 |
| 25 | 24 |
| 26 | 24 |
| 27 | 23 |
| 28 | 23 |
| 29 | 23 |
| 30 | 23 |
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 45% 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 (%) | 18 | 18 | 19 | 20 | 20 | 21 | 22 | 22 | 23 | 23 | 24 | 24 | 25 | 26 | 26 | 27 | 28 | 29 | 29 | 30 | 31 | 32 | 32 | 33 | 34 | 35 | 36 | 37 | 39 | 40 |
| Comfortable (%) | 49 | 48 | 48 | 48 | 47 | 47 | 47 | 47 | 47 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 46 | 45 | 45 | 45 | 45 | 44 | 44 | 43 | 43 | 42 | 42 | 41 | 40 | 39 |
| Humid (%) | 32 | 32 | 32 | 32 | 31 | 31 | 31 | 30 | 30 | 30 | 29 | 29 | 28 | 28 | 27 | 27 | 26 | 25 | 25 | 24 | 24 | 24 | 23 | 23 | 22 | 22 | 21 | 21 | 20 | 20 |
| Muggy (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| 1 | 18 | 49 | 32 | 1 |
| 2 | 18 | 48 | 32 | 1 |
| 3 | 19 | 48 | 32 | 1 |
| 4 | 20 | 48 | 32 | 1 |
| 5 | 20 | 47 | 31 | 1 |
| 6 | 21 | 47 | 31 | 1 |
| 7 | 22 | 47 | 31 | 1 |
| 8 | 22 | 47 | 30 | 1 |
| 9 | 23 | 47 | 30 | 1 |
| 10 | 23 | 46 | 30 | 1 |
| 11 | 24 | 46 | 29 | 1 |
| 12 | 24 | 46 | 29 | 1 |
| 13 | 25 | 46 | 28 | 1 |
| 14 | 26 | 46 | 28 | 1 |
| 15 | 26 | 46 | 27 | 1 |
| 16 | 27 | 46 | 27 | 0 |
| 17 | 28 | 46 | 26 | 0 |
| 18 | 29 | 45 | 25 | 0 |
| 19 | 29 | 45 | 25 | 0 |
| 20 | 30 | 45 | 24 | 0 |
| 21 | 31 | 45 | 24 | 0 |
| 22 | 32 | 44 | 24 | 0 |
| 23 | 32 | 44 | 23 | 1 |
| 24 | 33 | 43 | 23 | 1 |
| 25 | 34 | 43 | 22 | 1 |
| 26 | 35 | 42 | 22 | 1 |
| 27 | 36 | 42 | 21 | 1 |
| 28 | 37 | 41 | 21 | 1 |
| 29 | 39 | 40 | 20 | 1 |
| 30 | 40 | 39 | 20 | 1 |
Wind in September
Winds average 12 km/h in September, the calmest month.
Across September, daily wind ranges from about 12 km/h on the calmest days to 12 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) | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 12 | light breeze |
| 2 | 12 | light breeze |
| 3 | 12 | light breeze |
| 4 | 12 | light breeze |
| 5 | 12 | light breeze |
| 6 | 12 | light breeze |
| 7 | 12 | light breeze |
| 8 | 12 | light breeze |
| 9 | 12 | light breeze |
| 10 | 12 | light breeze |
| 11 | 12 | light breeze |
| 12 | 12 | light breeze |
| 13 | 12 | light breeze |
| 14 | 12 | light breeze |
| 15 | 12 | light breeze |
| 16 | 12 | light breeze |
| 17 | 12 | light breeze |
| 18 | 12 | light breeze |
| 19 | 12 | light breeze |
| 20 | 12 | light breeze |
| 21 | 12 | light breeze |
| 22 | 12 | light breeze |
| 23 | 12 | light breeze |
| 24 | 12 | light breeze |
| 25 | 12 | light breeze |
| 26 | 12 | light breeze |
| 27 | 12 | light breeze |
| 28 | 12 | light breeze |
| 29 | 12 | light breeze |
| 30 | 12 | light breeze |
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 6:07 AM to 6:36 AM, and sunset from 7:02 PM to 6:13 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 | 12.7 | 12.7 | 12.7 | 12.6 | 12.6 | 12.5 | 12.5 | 12.4 | 12.4 | 12.3 | 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) | 6:07 | 6:08 | 6:09 | 6:10 | 6:11 | 6:12 | 6:13 | 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 | 6:35 | 6:36 |
| Sunset (PM) | 7:02 | 7:01 | 6:59 | 6:58 | 6:56 | 6:54 | 6:53 | 6:51 | 6:49 | 6:47 | 6:46 | 6:44 | 6:42 | 6:41 | 6:39 | 6:37 | 6:36 | 6:34 | 6:32 | 6:30 | 6:29 | 6:27 | 6:25 | 6:24 | 6:22 | 6:20 | 6:19 | 6:17 | 6:15 | 6:13 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.9 | 6:07 | 7:02 |
| 2 | 12.9 | 6:08 | 7:01 |
| 3 | 12.8 | 6:09 | 6:59 |
| 4 | 12.8 | 6:10 | 6:58 |
| 5 | 12.7 | 6:11 | 6:56 |
| 6 | 12.7 | 6:12 | 6:54 |
| 7 | 12.7 | 6:13 | 6:53 |
| 8 | 12.6 | 6:14 | 6:51 |
| 9 | 12.6 | 6:15 | 6:49 |
| 10 | 12.5 | 6:16 | 6:47 |
| 11 | 12.5 | 6:17 | 6:46 |
| 12 | 12.4 | 6:18 | 6:44 |
| 13 | 12.4 | 6:19 | 6:42 |
| 14 | 12.3 | 6:20 | 6:41 |
| 15 | 12.3 | 6:21 | 6:39 |
| 16 | 12.3 | 6:22 | 6:37 |
| 17 | 12.2 | 6:23 | 6:36 |
| 18 | 12.2 | 6:24 | 6:34 |
| 19 | 12.1 | 6:25 | 6:32 |
| 20 | 12.1 | 6:26 | 6:30 |
| 21 | 12.0 | 6:27 | 6:29 |
| 22 | 12.0 | 6:28 | 6:27 |
| 23 | 11.9 | 6:29 | 6:25 |
| 24 | 11.9 | 6:30 | 6:24 |
| 25 | 11.9 | 6:31 | 6:22 |
| 26 | 11.8 | 6:32 | 6:20 |
| 27 | 11.8 | 6:33 | 6:19 |
| 28 | 11.7 | 6:34 | 6:17 |
| 29 | 11.7 | 6:35 | 6:15 |
| 30 | 11.6 | 6:36 | 6:13 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 5.14 kWh/m².
For context, solar energy here swings from a low near 1.91 kWh/m² to a high of 7.48 kWh/m² in July across the year — September's 5.14 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) | 6.0 | 5.9 | 5.9 | 5.8 | 5.8 | 5.7 | 5.6 | 5.6 | 5.5 | 5.5 | 5.4 | 5.3 | 5.3 | 5.2 | 5.1 | 5.1 | 5.0 | 5.0 | 4.9 | 4.9 | 4.8 | 4.8 | 4.7 | 4.7 | 4.6 | 4.6 | 4.5 | 4.5 | 4.4 | 4.4 |
| 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 | 6.0 | Bright |
| 2 | 5.9 | Bright |
| 3 | 5.9 | Bright |
| 4 | 5.8 | Bright |
| 5 | 5.8 | Bright |
| 6 | 5.7 | Bright |
| 7 | 5.6 | Bright |
| 8 | 5.6 | Bright |
| 9 | 5.5 | Bright |
| 10 | 5.5 | Bright |
| 11 | 5.4 | Bright |
| 12 | 5.3 | Bright |
| 13 | 5.3 | Bright |
| 14 | 5.2 | Bright |
| 15 | 5.1 | Bright |
| 16 | 5.1 | Bright |
| 17 | 5.0 | Bright |
| 18 | 5.0 | Bright |
| 19 | 4.9 | Bright |
| 20 | 4.9 | Bright |
| 21 | 4.8 | Bright |
| 22 | 4.8 | Bright |
| 23 | 4.7 | Bright |
| 24 | 4.7 | Bright |
| 25 | 4.6 | Bright |
| 26 | 4.6 | Bright |
| 27 | 4.5 | Bright |
| 28 | 4.5 | Bright |
| 29 | 4.4 | Bright |
| 30 | 4.4 | Bright |
Hazard calendar for Leiria
None of Leiria's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Leiria's rainy season runs October–May, when most of the year's rain falls.
Is September a good time to visit Leiria?
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 Leiria for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Leiria in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Leiria sees daytime highs around 25°C and nights near 14°C. Worth packing: light clothes and sun protection. About 6 days see rain.
Sea temperature near Leiria in September
The nearest coast averages about 19°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 30 km away) is warmest in August at about 19°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) | 15 | 14 | 14 | 15 | 16 | 18 | 18 | 19 | 19 | 18 | 17 | 15 |
| Comfort | Bracing | Bracing | Bracing | Cool | Cool | Cool | Cool | Cool | Cool | Cool | Cool | Cool |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 15 | Bracing |
| Feb | 14 | Bracing |
| Mar | 14 | Bracing |
| Apr | 15 | Cool |
| May | 16 | Cool |
| Jun | 18 | Cool |
| Jul | 18 | Cool |
| Aug | 19 | Cool |
| Sep | 19 | Cool |
| Oct | 18 | Cool |
| Nov | 17 | Cool |
| Dec | 15 | Cool |
UV index in Leiria 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 Leiria peaks around July 14 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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 | 6 | 7 | 7 | 9 | 9 | 8 | 6 | 5 | 2 | 2 |
| Level | Low | Moderate | High | Very high | High | Very high | Very high | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 6 | High |
| Apr | 7 | Very 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 Leiria 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 Leiria is worst in August — around 16 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 8 µg/m³).
Seasonal pattern from CAMS reanalysis, scaled to Leiria's WHO annual average of 11.8 µg/m³.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 9 | 11 | 14 | 12 | 10 | 13 | 11 | 16 | 13 | 16 | 8 | 8 |
| Level | Good | Good | Moderate | Moderate | Good | Moderate | Good | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 9 | Good |
| Feb | 11 | Good |
| Mar | 14 | Moderate |
| Apr | 12 | Moderate |
| May | 10 | Good |
| Jun | 13 | Moderate |
| Jul | 11 | Good |
| Aug | 16 | Moderate |
| Sep | 13 | Moderate |
| Oct | 16 | Moderate |
| Nov | 8 | Good |
| Dec | 8 | Good |
Where is Leiria?
Leiria sits at 39.7°N, 8.8°W, 33 m above sea level, in Portugal. The nearest listed city is Marinha Grande, 11 km away.
Topography around Leiria
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Leiria.
Within 3 km, the terrain around Leiria has only modest variations in elevation — a maximum elevation change of 138 m around an average of 73 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 520 m; within 80 km, large variations in elevation — a maximum elevation change of 1,199 m.
The land around Leiria is covered by trees (37%), artificial surfaces (34%) and grassland (23%) within 3 km, trees (60%) and grassland (26%) within 16 km, and trees (47%), water (24%) and grassland (21%) 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 Leiria (39.7436°, -8.8071°, elevation 33 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).