Portsmouth weather in August
In August, Portsmouth sees average daytime highs of 19°C and overnight lows near 15°C, with 64 mm of rain across 9.9 wet days and about 14.3 hours of daylight. It is the 1st-warmest and 5th-wettest month of the year here.
Day-to-day highs hold fairly steady near 19°C through the month. The sky is clear or mostly clear about 24% of the time in August, and the air most often feels comfortable.
Daylight stretches from about 15 h 12 min at the start of August to 13 h 24 min by month's end. Set against the rest of the year, August is Portsmouth's 2nd-clearest and 10th-windiest month. For the whole year in context, see Portsmouth's year-round climate.
- Daytime high
- 19°
- 1st warmest
- Overnight low
- 15°
- 12th coldest
- Rainfall
- 64 mm
- 9.9 wet days
- Daylight
- 14 h 18 min
- 4:58 AM – 7:19 PM
- Cloud cover
- 61%
- 2nd clearest
- Wind
- 18 km/h
- 10th windiest
- Solar energy
- 4.54 kWh/m²
- Travel score
- 6.1
- out of 10
Portsmouth is city in Hampshire, England, United Kingdom.
- Air quality
- Good
- PM2.5 8.9 µg/m³ · 2019
- Density
- 5,170/km²
- people per km²
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in August
Day-to-day highs hold fairly steady near 19°C through the month.
A typical August day in Portsmouth reaches about 19°C in the afternoon and slips back to 15°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 22°C. Set against its neighbours, August runs on par with July and about 2°C warmer than September.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 |
| Avg low (°C) | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 20 | 16 |
| 2 | 20 | 16 |
| 3 | 20 | 16 |
| 4 | 20 | 16 |
| 5 | 20 | 16 |
| 6 | 20 | 16 |
| 7 | 20 | 16 |
| 8 | 20 | 16 |
| 9 | 20 | 16 |
| 10 | 20 | 16 |
| 11 | 20 | 15 |
| 12 | 20 | 15 |
| 13 | 20 | 15 |
| 14 | 20 | 15 |
| 15 | 19 | 15 |
| 16 | 19 | 15 |
| 17 | 19 | 15 |
| 18 | 19 | 15 |
| 19 | 19 | 15 |
| 20 | 19 | 15 |
| 21 | 19 | 15 |
| 22 | 19 | 15 |
| 23 | 19 | 15 |
| 24 | 19 | 15 |
| 25 | 19 | 15 |
| 26 | 19 | 15 |
| 27 | 19 | 15 |
| 28 | 19 | 15 |
| 29 | 19 | 15 |
| 30 | 19 | 15 |
| 31 | 19 | 15 |
Portsmouth weather by month
How August compares with the rest of the year at a glance. August is the 1st-warmest and 5th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 8° / 5° | 84 | 13.4 | 0.6 | 8.2 | 1.3 |
| Feb | 8° / 5° | 60 | 10.5 | 0.5 | 9.7 | 1.2 |
| Mar | 9° / 6° | 50 | 10.1 | 0.3 | 11.5 | 1.9 |
| Apr | 11° / 7° | 52 | 9.7 | 0.1 | 13.5 | 2.9 |
| May | 14° / 10° | 50 | 9.1 | 0 | 15.2 | 4.2 |
| Jun | 17° / 13° | 51 | 9.5 | 0 | 16.2 | 5.4 |
| Jul | 19° / 15° | 52 | 9.6 | 0 | 15.8 | 6.2 |
| Aug | 19° / 15° | 64 | 9.9 | 0 | 14.3 | 6.1 |
| Sep | 18° / 14° | 62 | 10.2 | 0 | 12.4 | 5.6 |
| Oct | 15° / 11° | 96 | 13.4 | 0 | 10.4 | 4.0 |
| Nov | 11° / 8° | 99 | 13.8 | 0 | 8.7 | 2.5 |
| Dec | 9° / 6° | 92 | 13.4 | 0.3 | 7.8 | 1.6 |
Cloud cover in August
The sky is clear or mostly clear about 24% of the time in August.
Beyond those clear spells, partly cloudy skies cover about 21% of August, with mostly cloudy or overcast conditions the remaining 54%.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 48 | 49 | 48 | 48 | 48 | 48 | 47 | 47 | 46 | 46 | 46 | 47 | 46 | 46 | 47 | 47 | 46 | 45 | 46 | 45 | 44 | 44 | 44 | 44 | 43 | 42 | 42 | 43 | 43 | 41 | 41 |
| Cloudier (%) | 52 | 51 | 52 | 52 | 52 | 52 | 53 | 53 | 54 | 54 | 54 | 53 | 54 | 54 | 53 | 53 | 54 | 55 | 54 | 55 | 56 | 56 | 56 | 56 | 57 | 58 | 58 | 57 | 57 | 59 | 59 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 48 | 52 |
| 2 | 49 | 51 |
| 3 | 48 | 52 |
| 4 | 48 | 52 |
| 5 | 48 | 52 |
| 6 | 48 | 52 |
| 7 | 47 | 53 |
| 8 | 47 | 53 |
| 9 | 46 | 54 |
| 10 | 46 | 54 |
| 11 | 46 | 54 |
| 12 | 47 | 53 |
| 13 | 46 | 54 |
| 14 | 46 | 54 |
| 15 | 47 | 53 |
| 16 | 47 | 53 |
| 17 | 46 | 54 |
| 18 | 45 | 55 |
| 19 | 46 | 54 |
| 20 | 45 | 55 |
| 21 | 44 | 56 |
| 22 | 44 | 56 |
| 23 | 44 | 56 |
| 24 | 44 | 56 |
| 25 | 43 | 57 |
| 26 | 42 | 58 |
| 27 | 42 | 58 |
| 28 | 43 | 57 |
| 29 | 43 | 57 |
| 30 | 41 | 59 |
| 31 | 41 | 59 |
Chance of precipitation in August
Portsmouth gets around 64 mm of rain over 9.9 wet days in August. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 33% and peaks near 34% on the wettest days.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 33 | 34 | 34 | 34 | 34 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 32 | 32 | 32 | 31 | 31 | 31 | 30 | 30 | 30 |
| Rain chance (%) | |
|---|---|
| 1 | 33 |
| 2 | 34 |
| 3 | 34 |
| 4 | 34 |
| 5 | 34 |
| 6 | 33 |
| 7 | 33 |
| 8 | 33 |
| 9 | 33 |
| 10 | 33 |
| 11 | 33 |
| 12 | 33 |
| 13 | 33 |
| 14 | 33 |
| 15 | 33 |
| 16 | 33 |
| 17 | 33 |
| 18 | 33 |
| 19 | 33 |
| 20 | 33 |
| 21 | 33 |
| 22 | 33 |
| 23 | 32 |
| 24 | 32 |
| 25 | 32 |
| 26 | 31 |
| 27 | 31 |
| 28 | 31 |
| 29 | 30 |
| 30 | 30 |
| 31 | 30 |
Humidity in August
Most of August feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, August lands in the comfortable band about 48% 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 27 | 27 | 27 | 28 | 28 | 29 | 30 | 30 | 31 | 31 | 32 | 32 | 33 | 33 | 33 | 33 | 33 | 34 | 34 | 35 | 35 | 36 | 38 | 39 | 40 | 41 | 42 | 44 | 45 | 46 | 47 |
| Comfortable (%) | 54 | 53 | 53 | 51 | 51 | 50 | 49 | 49 | 48 | 47 | 47 | 47 | 47 | 47 | 47 | 47 | 47 | 48 | 48 | 48 | 48 | 47 | 47 | 47 | 46 | 46 | 46 | 45 | 44 | 43 | 42 |
| Humid (%) | 19 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 19 | 19 | 18 | 18 | 17 | 17 | 16 | 16 | 15 | 14 | 13 | 13 | 12 | 11 | 11 | 10 | 10 |
| Muggy (%) | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| 1 | 27 | 54 | 19 | 0 |
| 2 | 27 | 53 | 20 | 0 |
| 3 | 27 | 53 | 20 | 0 |
| 4 | 28 | 51 | 20 | 1 |
| 5 | 28 | 51 | 20 | 1 |
| 6 | 29 | 50 | 20 | 1 |
| 7 | 30 | 49 | 20 | 1 |
| 8 | 30 | 49 | 20 | 1 |
| 9 | 31 | 48 | 20 | 1 |
| 10 | 31 | 47 | 20 | 1 |
| 11 | 32 | 47 | 20 | 1 |
| 12 | 32 | 47 | 20 | 1 |
| 13 | 33 | 47 | 20 | 1 |
| 14 | 33 | 47 | 20 | 1 |
| 15 | 33 | 47 | 19 | 1 |
| 16 | 33 | 47 | 19 | 1 |
| 17 | 33 | 47 | 18 | 1 |
| 18 | 34 | 48 | 18 | 1 |
| 19 | 34 | 48 | 17 | 1 |
| 20 | 35 | 48 | 17 | 1 |
| 21 | 35 | 48 | 16 | 0 |
| 22 | 36 | 47 | 16 | 0 |
| 23 | 38 | 47 | 15 | 0 |
| 24 | 39 | 47 | 14 | 0 |
| 25 | 40 | 46 | 13 | 0 |
| 26 | 41 | 46 | 13 | 0 |
| 27 | 42 | 46 | 12 | 0 |
| 28 | 44 | 45 | 11 | 0 |
| 29 | 45 | 44 | 11 | 0 |
| 30 | 46 | 43 | 10 | 0 |
| 31 | 47 | 42 | 10 | 0 |
Wind in August
Winds average 18 km/h in August.
Across August, daily wind ranges from about 17 km/h on the calmest days to 19 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 17 | 17 | 17 | 17 | 17 | 17 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 19 |
| 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 | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 17 | light breeze |
| 2 | 17 | light breeze |
| 3 | 17 | light breeze |
| 4 | 17 | light breeze |
| 5 | 17 | light breeze |
| 6 | 17 | light breeze |
| 7 | 18 | light breeze |
| 8 | 18 | light breeze |
| 9 | 18 | light breeze |
| 10 | 18 | light breeze |
| 11 | 18 | light breeze |
| 12 | 18 | light breeze |
| 13 | 18 | light breeze |
| 14 | 18 | light breeze |
| 15 | 18 | light breeze |
| 16 | 18 | light breeze |
| 17 | 18 | light breeze |
| 18 | 18 | light breeze |
| 19 | 18 | light breeze |
| 20 | 18 | light breeze |
| 21 | 18 | light breeze |
| 22 | 18 | light breeze |
| 23 | 18 | light breeze |
| 24 | 18 | light breeze |
| 25 | 18 | light breeze |
| 26 | 18 | light breeze |
| 27 | 18 | light breeze |
| 28 | 18 | light breeze |
| 29 | 18 | light breeze |
| 30 | 18 | light breeze |
| 31 | 19 | light breeze |
Sunrise & sunset in August
Daylight runs from about 15 h 12 min at the start of August to 13 h 24 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 108 minutes over August. Sunrise moves from 4:35 AM to 5:22 AM, and sunset from 7:46 PM to 6:47 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 15.2 | 15.1 | 15.1 | 15.0 | 15.0 | 14.9 | 14.9 | 14.8 | 14.8 | 14.7 | 14.6 | 14.6 | 14.5 | 14.5 | 14.4 | 14.3 | 14.3 | 14.2 | 14.2 | 14.1 | 14.0 | 14.0 | 13.9 | 13.9 | 13.8 | 13.7 | 13.7 | 13.6 | 13.5 | 13.5 | 13.4 |
| Sunrise (AM) | 4:35 | 4:37 | 4:38 | 4:40 | 4:41 | 4:43 | 4:44 | 4:46 | 4:47 | 4:49 | 4:50 | 4:52 | 4:53 | 4:55 | 4:56 | 4:58 | 5:00 | 5:01 | 5:03 | 5:04 | 5:06 | 5:07 | 5:09 | 5:11 | 5:12 | 5:14 | 5:15 | 5:17 | 5:19 | 5:20 | 5:22 |
| Sunset (PM) | 7:46 | 7:44 | 7:42 | 7:41 | 7:39 | 7:37 | 7:36 | 7:34 | 7:32 | 7:30 | 7:29 | 7:27 | 7:25 | 7:23 | 7:21 | 7:19 | 7:17 | 7:15 | 7:13 | 7:11 | 7:09 | 7:07 | 7:04 | 7:02 | 7:00 | 6:58 | 6:56 | 6:54 | 6:51 | 6:49 | 6:47 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 15.2 | 4:35 | 7:46 |
| 2 | 15.1 | 4:37 | 7:44 |
| 3 | 15.1 | 4:38 | 7:42 |
| 4 | 15.0 | 4:40 | 7:41 |
| 5 | 15.0 | 4:41 | 7:39 |
| 6 | 14.9 | 4:43 | 7:37 |
| 7 | 14.9 | 4:44 | 7:36 |
| 8 | 14.8 | 4:46 | 7:34 |
| 9 | 14.8 | 4:47 | 7:32 |
| 10 | 14.7 | 4:49 | 7:30 |
| 11 | 14.6 | 4:50 | 7:29 |
| 12 | 14.6 | 4:52 | 7:27 |
| 13 | 14.5 | 4:53 | 7:25 |
| 14 | 14.5 | 4:55 | 7:23 |
| 15 | 14.4 | 4:56 | 7:21 |
| 16 | 14.3 | 4:58 | 7:19 |
| 17 | 14.3 | 5:00 | 7:17 |
| 18 | 14.2 | 5:01 | 7:15 |
| 19 | 14.2 | 5:03 | 7:13 |
| 20 | 14.1 | 5:04 | 7:11 |
| 21 | 14.0 | 5:06 | 7:09 |
| 22 | 14.0 | 5:07 | 7:07 |
| 23 | 13.9 | 5:09 | 7:04 |
| 24 | 13.9 | 5:11 | 7:02 |
| 25 | 13.8 | 5:12 | 7:00 |
| 26 | 13.7 | 5:14 | 6:58 |
| 27 | 13.7 | 5:15 | 6:56 |
| 28 | 13.6 | 5:17 | 6:54 |
| 29 | 13.5 | 5:19 | 6:51 |
| 30 | 13.5 | 5:20 | 6:49 |
| 31 | 13.4 | 5:22 | 6:47 |
Solar energy in August
Average shortwave solar energy reaching the ground each day in August, about 4.54 kWh/m².
For context, solar energy here swings from a low near 0.71 kWh/m² to a high of 5.67 kWh/m² in June across the year — August's 4.54 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.1 | 5.1 | 5.0 | 5.0 | 5.0 | 4.9 | 4.9 | 4.9 | 4.8 | 4.8 | 4.8 | 4.7 | 4.7 | 4.6 | 4.6 | 4.5 | 4.5 | 4.5 | 4.4 | 4.4 | 4.3 | 4.3 | 4.3 | 4.2 | 4.2 | 4.1 | 4.1 | 4.1 | 4.0 | 4.0 | 4.0 |
| 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 | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.1 | Bright |
| 2 | 5.1 | Bright |
| 3 | 5.0 | Bright |
| 4 | 5.0 | Bright |
| 5 | 5.0 | Bright |
| 6 | 4.9 | Bright |
| 7 | 4.9 | Bright |
| 8 | 4.9 | Bright |
| 9 | 4.8 | Bright |
| 10 | 4.8 | Bright |
| 11 | 4.8 | Bright |
| 12 | 4.7 | Bright |
| 13 | 4.7 | Bright |
| 14 | 4.6 | Bright |
| 15 | 4.6 | Bright |
| 16 | 4.5 | Bright |
| 17 | 4.5 | Bright |
| 18 | 4.5 | Bright |
| 19 | 4.4 | Bright |
| 20 | 4.4 | Bright |
| 21 | 4.3 | Bright |
| 22 | 4.3 | Bright |
| 23 | 4.3 | Bright |
| 24 | 4.2 | Bright |
| 25 | 4.2 | Bright |
| 26 | 4.1 | Bright |
| 27 | 4.1 | Bright |
| 28 | 4.1 | Bright |
| 29 | 4.0 | Bright |
| 30 | 4.0 | Bright |
| 31 | 4.0 | Moderate |
Is August a good time to visit Portsmouth?
Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
August is a reasonable time to visit Portsmouth for sightseeing.
What to pack for Portsmouth in August
From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In August, Portsmouth sees daytime highs around 19°C and nights near 15°C. Worth packing: rain gear and sun protection. About 10 days see rain.
Sea temperature near Portsmouth in August
The nearest coast averages about 18°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 19 km away) is warmest in August at about 18°C and coldest in March near 8°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) | 9 | 8 | 8 | 9 | 11 | 14 | 16 | 18 | 17 | 16 | 13 | 11 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Cool | Cool | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 9 | Bracing |
| Feb | 8 | Bracing |
| Mar | 8 | Bracing |
| Apr | 9 | Bracing |
| May | 11 | Bracing |
| Jun | 14 | Bracing |
| Jul | 16 | Cool |
| Aug | 18 | Cool |
| Sep | 17 | Cool |
| Oct | 16 | Cool |
| Nov | 13 | Bracing |
| Dec | 11 | Bracing |
UV index in Portsmouth in August
Clear-sky midday UV in August 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 Portsmouth peaks around August 11 at about 6 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 1 | 3 | 4 | 6 | 6 | 6 | 6 | 4 | 2 | 1 | 1 |
| Level | Low | Low | Moderate | Moderate | High | High | High | High | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 1 | Low |
| Mar | 3 | Moderate |
| Apr | 4 | Moderate |
| May | 6 | High |
| Jun | 6 | High |
| Jul | 6 | High |
| Aug | 6 | High |
| Sep | 4 | Moderate |
| Oct | 2 | Moderate |
| Nov | 1 | Low |
| Dec | 1 | Low |
Where is Portsmouth?
Portsmouth sits at 50.8°N, 1.1°W, 6 m above sea level, in United Kingdom. The nearest listed city is Southsea, 2.0 km away.
Topography around Portsmouth
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Portsmouth.
Within 3 km, the terrain around Portsmouth has only modest variations in elevation — a maximum elevation change of 18 m around an average of 4 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 158 m; within 80 km, significant variations in elevation — a maximum elevation change of 300 m.
The land around Portsmouth is covered by artificial surfaces (50%) and water (35%) within 3 km, water (42%) and grassland (20%) within 16 km, and water (34%), grassland (24%) and trees (21%) within 80 km.
United Kingdom travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type D / G / M
- 230 V · 50 Hz
- Prices
- ≈ 89% of US
- price level, 2025
- GDP per capita
- $57,602
- 2025
- Happiness
- 6.7 / 10
- World Happiness, 2025
- Safe drinking water
- 100%
- of population, 2024
- Homicide rate
- 1.1
- per 100k, 2021
- Road deaths
- 3.2
- per 100k/yr, 2019
- Income group
- High
- World Bank
- 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 Portsmouth (50.799°, -1.0913°, elevation 6 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).