Avg High
Lisbon in May
Avg Low
Rain
Daylight
14h
What to expect
May in Lisbon is late spring, a shoulder-season window, so you can get a bit of variety across the month. The month is mostly mild for steady exploring, with a noticeable cool-down after sunset. Most days feel close to what the averages suggest, with straightforward pacing. There is plenty of daylight to stretch outdoor time.
May in context
How it compares to the rest of the year in Lisbon.
Hottest (avg)
#6 / 12
Wettest (avg)
#8 / 12
Daylight Hours
#3 / 12
Windiest (avg)
#4 / 12
Highest UV
#3 / 12
Most Humid
#9 / 12
Monthly climate breakdown
Temperature
- Daytime high
-
- Nighttime low
-
- Feels like (avg)
-
Sunshine
- Daylight hours
- 14.3 h
- UV index (max)
- 8
- Typical sun hours
- 05:24 - 19:41
Rain & Snow
- Total rain
-
- Rainy days
- 8 days
- Cloud cover (avg)
- 45%
Humidity & Wind
- Humidity (avg)
- 73%
- Wind (avg)
-
- Wind (max gusts)
-
Daily climate explorer
Day 15 selected for May. Typical high 19.9°C and low 14.2°C.
Typical disruptions in May
Based on 30 years of historical data, these are the disruption patterns most likely to affect plans in May.
Rain High impact
Washout risk Measures: Washout day risk. Observed about 9% of days (2.7 days/month) in May. Historical risk signal only, not a day-by-day forecast.
2.7 days / month
~9% of days
Why this matters
- Expected days 2.7 days / month
- Probability ~9% of days
- Intensity Up to ~22mm (P95)
Washout conditions are possible on ~3 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind High impact
Strong gusts Measures: Strong gust days (>=60 km/h). Observed about 4% of days (1.2 days/month) in May. Historical risk signal only, not a day-by-day forecast.
1.2 days / month
~4% of days
Why this matters
- Expected days 1.2 days / month
- Probability ~4% of days
- Intensity Up to ~73km/h (P95)
Strong gusts are possible on ~1 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Wind High impact
Stormy conditions Measures: Storm-impact proxy days. Observed about 3% of days (0.8 days/month) in May. Historical risk signal only, not a day-by-day forecast.
0.8 days / month
~3% of days
Why this matters
- Expected days 0.8 days / month
- Probability ~3% of days
- Intensity Up to ~70km/h (P95)
Stormy conditions are possible on ~1 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Rain Moderate
Rain disruption Measures: Likely rain disruption days. Observed about 9% of days (2.7 days/month) in May. Historical risk signal only, not a day-by-day forecast.
2.7 days / month
~9% of days
Why this matters
- Expected days 2.7 days / month
- Probability ~9% of days
- Intensity Up to ~22mm (P95)
Rain disruption risk appears on ~3 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Heat Moderate
Hot feels-like days Measures: Hot feels-like days (>=32C). Observed about 3% of days (0.9 days/month) in May. Historical risk signal only, not a day-by-day forecast.
0.9 days / month
~3% of days
Why this matters
- Expected days 0.9 days / month
- Probability ~3% of days
- Intensity Up to ~35°C (P95)
Feels-like heat >=32C is possible on ~1 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Heat Minor
Hot days Measures: Hot days (>=30C). Observed about 2% of days (0.6 days/month) in May. Historical risk signal only, not a day-by-day forecast.
0.6 days / month
~2% of days
Why this matters
- Expected days 0.6 days / month
- Probability ~2% of days
- Intensity Up to ~33°C (P95)
Hot days are possible on ~1 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Show all disruptions (14 more)
Rain High impact
Washout run Measures: Multi-day washout runs. Observed about 0.6 days/month in May. Historical risk signal only, not a day-by-day forecast.
0.6 days / month
Probability unavailable
Why this matters
- Expected days 0.6 days / month
- Probability —
- Intensity Up to ~18mm (P95)
Multi-day washout runs are possible on ~1 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain Moderate
Heavy rain days Measures: Heavy rain days (>=10mm). Observed about 4% of days (1.4 days/month) in May. Historical risk signal only, not a day-by-day forecast.
1.4 days / month
~4% of days
Why this matters
- Expected days 1.4 days / month
- Probability ~4% of days
- Intensity Up to ~27mm (P95)
Heavy rain is possible on ~1 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind Minor
Gusty days Measures: Gusty days (>=40 km/h). Observed about 50% of days (15.6 days/month) in May. Historical risk signal only, not a day-by-day forecast.
15.6 days / month
~50% of days
Why this matters
- Expected days 15.6 days / month
- Probability ~50% of days
- Intensity Up to ~62km/h (P95)
Gusty conditions are possible on ~16 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Cloud Minor
Cloudy days Measures: Cloudy days (cloud cover >=60%). Observed about 34% of days (10.5 days/month) in May. Historical risk signal only, not a day-by-day forecast.
10.5 days / month
~34% of days
Why this matters
- Expected days 10.5 days / month
- Probability ~34% of days
- Intensity Up to ~98% (P95)
Cloudy skies are possible on ~11 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Wet days Measures: Wet days (>=0.1mm). Observed about 34% of days (10.5 days/month) in May. Historical risk signal only, not a day-by-day forecast.
10.5 days / month
~34% of days
Why this matters
- Expected days 10.5 days / month
- Probability ~34% of days
- Intensity Up to ~16mm (P95)
Measurable rain is possible on ~10 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Rainy hours Measures: Rain-hours signal (>=3h rain). Observed about 25% of days (7.9 days/month) in May. Historical risk signal only, not a day-by-day forecast.
7.9 days / month
~25% of days
Why this matters
- Expected days 7.9 days / month
- Probability ~25% of days
- Intensity Up to ~21h (P95)
Several rainy hours are possible on ~8 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Humidity Minor
High humidity Measures: High humidity days (RH >=80%). Observed about 24% of days (7.5 days/month) in May. Historical risk signal only, not a day-by-day forecast.
7.5 days / month
~24% of days
Why this matters
- Expected days 7.5 days / month
- Probability ~24% of days
- Intensity Up to ~91% (P95)
High humidity is possible on ~8 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops.
Rain Minor
Wet most of day Measures: Wet-most-of-day signal (>=6h rain). Observed about 16% of days (5.0 days/month) in May. Historical risk signal only, not a day-by-day forecast.
5.0 days / month
~16% of days
Why this matters
- Expected days 5.0 days / month
- Probability ~16% of days
- Intensity Up to ~22h (P95)
Wet-most-of-day conditions are possible on ~5 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Cloud Minor
Mostly cloudy days Measures: Mostly cloudy days (cloud cover >=80%). Observed about 14% of days (4.2 days/month) in May. Historical risk signal only, not a day-by-day forecast.
4.2 days / month
~14% of days
Why this matters
- Expected days 4.2 days / month
- Probability ~14% of days
- Intensity Up to ~99% (P95)
Mostly cloudy skies are possible on ~4 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Wind Minor
Breezy days Measures: Breezy days (mean wind >=25 km/h). Observed about 12% of days (3.6 days/month) in May. Historical risk signal only, not a day-by-day forecast.
3.6 days / month
~12% of days
Why this matters
- Expected days 3.6 days / month
- Probability ~12% of days
- Intensity Up to ~34km/h (P95)
Breezy conditions are possible on ~4 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Cloud Minor
Overcast days Measures: Overcast days (cloud cover >=95%). Observed about 4% of days (1.2 days/month) in May. Historical risk signal only, not a day-by-day forecast.
1.2 days / month
~4% of days
Why this matters
- Expected days 1.2 days / month
- Probability ~4% of days
- Intensity Up to ~100% (P95)
Overcast skies are possible on ~1 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Visibility Minor
Fog-likely signal Measures: Fog-likely visibility proxy. Observed about 1% of days (0.4 days/month) in May. Historical risk signal only, not a day-by-day forecast.
0.4 days / month
~1% of days
Why this matters
- Expected days 0.4 days / month
- Probability ~1% of days
- Intensity Up to ~93% (P95)
Fog-likely conditions are possible on ~0 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Other Minor
Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data Measures: Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data. Observed about 1% of days (0.4 days/month) in May. Historical risk signal only, not a day-by-day forecast.
0.4 days / month
~1% of days
Why this matters
- Expected days 0.4 days / month
- Probability ~1% of days
- Intensity Up to ~93 (P95)
Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data is possible on ~0 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Heat Minor
Feels-like heatwave Measures: Feels-like heatwave runs (>=3 days). Observed about 0.1 days/month in May. Historical risk signal only, not a day-by-day forecast.
0.1 days / month
Probability unavailable
Why this matters
- Expected days 0.1 days / month
- Probability —
- Intensity Up to ~33°C (P95)
Feels-like heatwave runs are possible on ~0 days. Midday activity often needs adjustment around shade, hydration, and indoor fallback options.
Frequently asked questions
Is May a good time to visit Lisbon?
Typical May days in Lisbon reach highs of 21°C (70°F) with nights around 14°C (57°F). It usually feels mild by day and cool after dark. Overall, May sits in the middle of the Lisbon climate range.
What are temperatures like in May?
In May, you can usually expect highs of 21°C (70°F) and lows near 14°C (57°F). That means mild days and cool nights, so pack layers you can add or remove.
How much does it rain in May?
Rainfall in May averages 40 mm (1.6 in) across roughly 8 days. Overall it is a moderately wet time of year, so showers are usually brief rather than all-day downpours.
How many hours of daylight are there in May?
You can expect about 14 hours of daylight in May. Sunrise is typically around 05:24 and sunset near 19:41. You get long days with comfortable amounts of daylight.
How strong is the sun in May?
UV levels frequently reach very high levels (around 8), so strong sun protection is essential, especially around midday.
Is it windy in May?
In May, average wind speeds are around 17 km/h (11 mph), with gusts on the windiest days reaching about 54 km/h (34 mph). On the ground, it is it can feel quite windy at times, particularly when weather systems move through.