Hottest (avg)
#8 / 12
Sits around the middle of the year.
May in context
How it compares to the rest of the year in Perth.
Wettest (avg)
#4 / 12
Typical rainfall for the year.
Daylight Hours
#10 / 12
Shorter days.
Windiest (avg)
#12 / 12
Usually calmer than most months.
Highest UV
#10 / 12
UV is gentler than usual.
Most Humid
#5 / 12
Humidity stays close to the yearly norm.
Monthly climate breakdown
A detailed look at the typical climate conditions for May.
Thermal profile
Temperature
Typical daytime high
- Nighttime low
-
- Feels like (avg)
-
Light window
Sunshine
10.5 h
Average daylight
- UV index (max)
- 5
- Typical sun hours
- 06:58 - 17:27
Wet-day pattern
Rain & Snow
Typical rainfall
- Rainy days
- 10 days
- Cloud cover (avg)
- 45%
Air feel
Humidity & Wind
69%
Average humidity
- Wind (avg)
-
- Wind (max gusts)
-
Historical daily baseline
Daily climate explorer
Pick a day to inspect the usual conditions through May in Perth. Based on a 30-year historical climate baseline, not a forecast.
Primary control
Select a day
Scroll to compare daily conditions. The summary updates with your selection.
Secondary context
Monthly trend
Median daytime highs across the month, with a softer low line.
Median temperatureMedian lowTypical range
Day 15 selected for May. Temperature 20.4°C.
Historical disruption baseline
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
Rain disruption Measures: Likely rain disruption days. Observed about 15% of days (4.6 days/month) in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
4.6 days / month
- Share of days
- ~15% of days
- Upper edge
- Up to ~31mm (P95)
Why this matters
Rain disruption risk appears on ~5 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain High impact
Washout risk Measures: Washout day risk. Observed about 14% of days (4.4 days/month) in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
4.4 days / month
- Share of days
- ~14% of days
- Upper edge
- Up to ~32mm (P95)
Why this matters
Washout conditions are possible on ~4 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 8% of days (2.5 days/month) in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
2.5 days / month
- Share of days
- ~8% of days
- Upper edge
- Up to ~96km/h (P95)
Why this matters
Strong gusts are possible on ~3 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 6% of days (1.9 days/month) in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
1.9 days / month
- Share of days
- ~6% of days
- Upper edge
- Up to ~91km/h (P95)
Why this matters
Stormy conditions are possible on ~2 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Wind High impact
Severe gusts Measures: Severe gust days (>=80 km/h). Observed about 2% of days (0.6 days/month) in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.6 days / month
- Share of days
- ~2% of days
- Upper edge
- Up to ~103km/h (P95)
Why this matters
Severe gusts are possible on ~1 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Cold Moderate
Cold feels-like nights Measures: Cold feels-like nights (min <=5C). Observed about 3% of days (1.0 days/month) in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
1.0 days / month
- Share of days
- ~3% of days
- Upper edge
- Up to ~5°C (P95)
Why this matters
Cold feels-like nights are possible on ~1 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Show all disruptions (15 more)
Rain High impact
Heavy rain days Measures: Heavy rain days (>=10mm). Observed about 9% of days (2.6 days/month) in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
2.6 days / month
- Share of days
- ~9% of days
- Upper edge
- Up to ~39mm (P95)
Why this matters
Heavy rain is possible on ~3 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain High impact
Washout run Measures: Multi-day washout runs. Observed about 0.9 days/month in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.9 days / month
- Share of days
- —
- Upper edge
- Up to ~38mm (P95)
Why this matters
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 High impact
Very heavy rain Measures: Very heavy rain days (>=25mm). Observed about 2% of days (0.5 days/month) in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.5 days / month
- Share of days
- ~2% of days
- Upper edge
- Up to ~62mm (P95)
Why this matters
Very heavy rain is possible on ~0 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind High impact
Wind disruption Measures: Disruptive wind days. Observed about 1% of days (0.4 days/month) in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.4 days / month
- Share of days
- ~1% of days
- Upper edge
- Up to ~107km/h (P95)
Why this matters
Disruptive wind is possible on ~0 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Wind High impact
Wind disruption run Measures: Multi-day wind disruption runs. Observed about 0.1 days/month in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.1 days / month
- Share of days
- —
- Upper edge
- Up to ~97km/h (P95)
Why this matters
Multi-day disruptive wind runs are possible on ~0 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Rain Minor
Wet days Measures: Wet days (>=0.1mm). Observed about 37% of days (11.4 days/month) in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
11.4 days / month
- Share of days
- ~37% of days
- Upper edge
- Up to ~24mm (P95)
Why this matters
Measurable rain is possible on ~11 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Wind Minor
Gusty days Measures: Gusty days (>=40 km/h). Observed about 35% of days (10.9 days/month) in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
10.9 days / month
- Share of days
- ~35% of days
- Upper edge
- Up to ~83km/h (P95)
Why this matters
Gusty conditions are possible on ~11 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 33% of days (10.3 days/month) in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
10.3 days / month
- Share of days
- ~33% of days
- Upper edge
- Up to ~99% (P95)
Why this matters
Cloudy skies are 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 30% of days (9.3 days/month) in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
9.3 days / month
- Share of days
- ~30% of days
- Upper edge
- Up to ~21h (P95)
Why this matters
Several rainy hours are possible on ~9 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain Minor
Wet most of day Measures: Wet-most-of-day signal (>=6h rain). Observed about 23% of days (7.0 days/month) in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
7.0 days / month
- Share of days
- ~23% of days
- Upper edge
- Up to ~22h (P95)
Why this matters
Wet-most-of-day conditions are possible on ~7 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 22% of days (6.7 days/month) in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
6.7 days / month
- Share of days
- ~22% of days
- Upper edge
- Up to ~89% (P95)
Why this matters
High humidity is possible on ~7 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops.
Cloud Minor
Mostly cloudy days Measures: Mostly cloudy days (cloud cover >=80%). Observed about 14% of days (4.3 days/month) in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
4.3 days / month
- Share of days
- ~14% of days
- Upper edge
- Up to ~100% (P95)
Why this matters
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 8% of days (2.6 days/month) in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
2.6 days / month
- Share of days
- ~8% of days
- Upper edge
- Up to ~40km/h (P95)
Why this matters
Breezy conditions are possible on ~3 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 (1.4 days/month) in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
1.4 days / month
- Share of days
- ~4% of days
- Upper edge
- Up to ~100% (P95)
Why this matters
Overcast skies are possible on ~1 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Wind Minor
Windy days Measures: Windy days (mean wind >=35 km/h). Observed about 1% of days (0.4 days/month) in May. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.4 days / month
- Share of days
- ~1% of days
- Upper edge
- Up to ~43km/h (P95)
Why this matters
Strong mean winds are possible on ~0 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Travel planning FAQ
Frequently asked questions
Quick answers to the weather questions you ask the most.
Is May a good time to visit Perth?
Typical May days in Perth reach highs of 21°C (70°F) with nights around 13°C (55°F). It usually feels mild by day and cool after dark. Overall, May sits in the middle of the Perth climate range.
What are temperatures like in May?
Daytime temperatures in May typically peak near 21°C (70°F), while nights drop to around 13°C (55°F). Expect mild afternoons and cool evenings.
How much does it rain in May?
Rainfall in May averages 73 mm (2.9 in) across roughly 10 days. Overall it is a quite rainy 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 10 hours of daylight in May. Sunrise is typically around 06:58 and sunset near 17:27. Days are on the shorter side, so plan activities around limited daylight.
How strong is the sun in May?
UV levels are moderate (around 5); sunscreen and sunglasses are still a good idea.
Is it windy in May?
In May, average wind speeds are around 15 km/h (9 mph), with gusts on the windiest days reaching about 57 km/h (35 mph). On the ground, it is it can feel quite windy at times, particularly when weather systems move through.