Weather in Cascais — today
Now in Cascais
🌙
+17°
Clear
Feels like +18° · humidity 86%
Today 12.9: +29° / +17°
🕐 06:25
Wind
5 km/h
UV index
0
Air (AQI)
22 · Good
Precipitation
0%
Humidity
86%
Pressure
1018 hPa
Sunrise / sunset
07:16 / 19:50
Sea temperature
🌊 +17°
👕 What to wear today
Warm — a T-shirt and light trousers or shorts.
Weather for an activity:
Detailed weather information for Cascais
Today, 12 September, Saturday, in Cascais (Portugal): clear and sunny, warm. During the day the air will warm up to +29°, at night around +17°. Due to the wind it feels like +18°. Wind up to 12 km/h. No precipitation expected, you won't need an umbrella. Light summer clothing will do — a T-shirt and shorts or light trousers. The water is cold, +17° — too chilly for swimming. The sun will rise at 07:16 and set at 19:50 — daylight lasts 13 hours.Hourly weather in Cascais
💧 No precipitation expected on this day. Shaded areas of the chart are the dark hours (before sunrise 🌅 and after sunset 🌇).
Weather in Cascais for 14 days
Tap a day to expand it by time of day and open the full forecast. The bar shows the range from the night low (left) to the day high (right).
▶
Today 12.9
☀️
+17° +29°
Morning
☀️
+17°
Day
☀️
+29°
Evening
🌇
+27°
Night
🌙
+17°
▶
Tomorrow 13.9
☀️
+19° +29°
Morning
☀️
+20°
Day
☀️
+29°
Evening
🌇
+28°
Night
🌙
+19°
▶
Mon 14.9
☀️
+19° +28°
Morning
☀️
+22°
Day
☀️
+28°
Evening
🌇
+26°
Night
🌙
+19°
▶
Tue 15.9
🌤️
+19° +28°
Morning
🌤️
+22°
Day
🌤️
+28°
Evening
🌇
+26°
Night
🌙
+19°
▶
Wed 16.9
⛅
+19° +25°
Morning
⛅
+21°
Day
⛅
+25°
Evening
🌇
+24°
Night
🌙
+19°
▶
Thu 17.9
☁️
+17° +29°
Morning
☁️
+21°
Day
☁️
+29°
Evening
🌇
+26°
Night
🌙
+17°
▶
Fri 18.9
☁️
+16° +31°
Morning
☁️
+22°
Day
☁️
+31°
Evening
🌇
+27°
Night
🌙
+16°
▶
Sat 19.9
⛅
💧 2%
+16° +25°
Morning
⛅
+19°
Day
⛅
+25°
Evening
🌇
+23°
Night
🌙
+16°
▶
Sun 20.9
🌤️
+16° +26°
Morning
🌤️
+20°
Day
🌤️
+26°
Evening
🌇
+24°
Night
🌙
+16°
▶
Mon 21.9
☀️
💧 2%
+19° +25°
Morning
☀️
+21°
Day
☀️
+25°
Evening
🌇
+24°
Night
🌙
+19°
▶
Tue 22.9
☀️
💧 2%
+17° +22°
Morning
☀️
+19°
Day
☀️
+22°
Evening
🌇
+21°
Night
🌙
+17°
▶
Wed 23.9
⛅
💧 2%
+15° +25°
Morning
⛅
+19°
Day
⛅
+25°
Evening
🌇
+23°
Night
🌙
+15°
▶
Thu 24.9
☁️
💧 8%
+21° +25°
Morning
☁️
+22°
Day
☁️
+25°
Evening
🌇
+24°
Night
🌙
+21°
▶
Fri 25.9
☀️
💧 14%
+19° +26°
Morning
☀️
+22°
Day
☀️
+26°
Evening
🌇
+24°
Night
🌙
+19°
🗺️ Precipitation radar
Precipitation radar (RainViewer) over a clean base map — updates every 5–10 minutes. Colours show nearby precipitation; if there is none, the map is simply clear — that is normal. Zoom with + / −.
Rain intensity:lightmoderateheavy
🎯 What to do in this weather — indices of the day
Comfort score from 0 (bad) to 100 (excellent), calculated from the day's weather. For “rain” and “UV” a percentage/risk level is shown.
🏖️ Beach
100 / 100
for sea and sun · Excellent
🏊 Swimming
6 / 100
water 17° · Bad
🏃 Running
68 / 100
comfort for running · Good
🧴 UV
0%
moderate · low
☂️ Rain
0%
unlikely · low
✨ Stars
88 / 100
evening visibility · Excellent
🧺 Laundry drying
58 / 100
will dry outside · Average
🚗 Car wash
95 / 100
no rain expected · Excellent
🌫️ Air quality and pollen
22
Good air
European AQI
PM2.5: 6PM10: 11O₃: 63NO₂: 5 pollen: low
The air is clean — you can walk and exercise outside.
🌅 Sun, moon and sea
Sunrise
07:16
Sunset
19:50
Golden hour
19:15
Daylight
13 h (-3 min vs yesterday)
Sea temperature
+17°
🌊 slight, waves 0.9 m.
Cascais climate by month
Long-term averages. Hover over a bar for details. The forecast for a specific month is a combination of the climate normal and the model forecast for the coming weeks.
+14°
+10°
Jan
+15°
+10°
Feb
+16°
+12°
Mar
+17°
+13°
Apr
+20°
+15°
May
+22°
+17°
Jun
+24°
+18°
Jul
+24°
+19°
Aug
+23°
+18°
Sep
+21°
+16°
Oct
+17°
+13°
Nov
+15°
+11°
Dec
swipe sideways →
Bar color shows temperature:frostcoolcomfortablewarmhot— best months to visit
| Month | Day | Night | Sea | Precipitation | What to pack and what makes the month notable (events, nuances) |
|---|---|---|---|---|---|
| January | +14° | +10° | +15° | 71 mm | Cool: around +14° by day, you'll need a warm layer. It's a rainy month (71 mm) — an umbrella is a must. 🧥 a warm jacket. The water is cold (+15°) — swimming is for the brave. This is the coldest month of the year. |
| February | +15° | +10° | +15° | 53 mm | A fresh month — +15° daytime, take a jacket for walks. 🧥 a warm jacket. The water is cold (+15°) — swimming is for the brave. |
| March | +16° | +12° | +15° | 56 mm | Cool weather: +16° by day, noticeably colder in the evening. 🙂 a sweater for the evening. The water is cold (+15°) — swimming is for the brave. |
| April | +17° | +13° | +16° | 55 mm | Cool: around +17° by day, you'll need a warm layer. 🙂 a sweater for the evening. The water is cold (+16°) — swimming is for the brave. |
| May | +20° | +15° | +16° | 44 mm | Ideal weather: +20° daytime — neither hot nor cold. 🙂 a sweater for the evening. The water is cold (+16°) — swimming is for the brave. |
| June | +22° | +17° | +17° | 13 mm | The most pleasant season: +22° by day, comfortable all day long. 🙂 a sweater for the evening. The water is cold (+17°) — swimming is for the brave. The longest daylight hours of the year — more time for everything. |
| July | +24° | +18° | +17° | 3 mm | One of the best times to visit: +24° by day, fresh nights. 🙂 a sweater for the evening. The water is cold (+17°) — swimming is for the brave. One of the driest months — rain is very unlikely. |
| August | +24° | +19° | +17° | 5 mm | Ideal weather: +24° daytime — neither hot nor cold. 😊 light summer clothing. The water is cold (+17°) — swimming is for the brave. This is the hottest month of the year in Cascais. |
| September | +23° | +18° | +17° | 29 mm | The most pleasant season: +23° by day, comfortable all day long. 🙂 a sweater for the evening. The water is cold (+17°) — swimming is for the brave. |
| October | +21° | +16° | +18° | 79 mm | One of the best times to visit: +21° by day, fresh nights. It's a rainy month (79 mm) — an umbrella is a must. 🙂 a sweater for the evening. Sea at +18° — swimmable, refreshing. |
| November | +17° | +13° | +18° | 86 mm | A fresh month — +17° daytime, take a jacket for walks. Frequent rain (86 mm over the month) — keep indoor backup plans. 🙂 a sweater for the evening. Sea at +18° — swimmable, refreshing. Statistically the wettest month of the year. |
| December | +15° | +11° | +16° | 82 mm | Cool weather: +15° by day, noticeably colder in the evening. One of the wettest months (82 mm): downpours can derail plans. 🧥 a warm jacket. The water is cold (+16°) — swimming is for the brave. The shortest daylight of the year — it gets dark early. |
When to visit Cascais
✅ Recommended time to visit
🌟 Best time: June, July, August
Daytime air+22…+24°
Sea temperature+17…+17°
Precipitationalmost none
Why: comfortable +22…+24° by day, little rain.
⚠️ Doable, with caveats
🌤️ Shoulder season: February, March, April, May, September, October
Daytime air+15…+23°
Sea temperature+15…+18°
Precipitationoften
Why: cool (+15…+23°) — not beach season, but great for city sights and museums.
🔴 Not the best time
🌤️ Shoulder season: January, November, December
Daytime air+14…+17°
Sea temperature+15…+18°
Precipitationoften
Why: the rainy season (71–86 mm/month) — downpours almost daily.
Bottom line: the best time to visit Cascais is June – August, and the most comfortable months are June, July, August. The toughest months to visit are January, November, December: frequent rain.
🌡️ Today vs the climate normal
Today's high
+29°
Normal for September
+23°
Deviation
6° warmer than normal
A year ago on this day
+23°
Record for this date
+33° (2003)
The normal, “a year ago” and the record come from the weather archive since 1940 (Open-Meteo / ERA5).
Weather archive for Cascais
📅 See what the weather was like on any day since 1940. For example: “what was the weather on March 2, 2021”.
Show the archive for the selected day →
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Weather in cities near Cascais
Frequently asked questions about the weather in Cascais
What is the weather in Cascais right now?＋
Clear, +17°, feels like +18°.
Will it rain in Cascais today?＋
No: 0% chance, 0 mm.
When is the best time to visit Cascais?＋
Best time to visit — June – August.
Can you swim in Cascais in summer?＋
In winter the water is around +15° — swimming is for the brave. In summer the sea warms up to +17°.
What time are sunrise and sunset in Cascais?＋
Sunrise 07:16, sunset 19:50.
Does it snow in Cascais in winter?＋
No, it practically never snows.
What is the climate in Cascais by month?＋
Summers up to +24° in August, winters around +10° in January; the wettest month is November.
Is it cold in Cascais in winter?＋
🧥 Cool. You'll need a warm jacket; it can get chilly in the evening.