Blue Mountains weather in May

In May, Blue Mountains sees average daytime highs of 15°C and overnight lows near 6°C, with 48 mm of precipitation across 6.6 wet days and about 10.3 hours of daylight. It is the 9th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 17°C in the first days to 14°C by the end. The sky is clear or mostly clear about 43% of the time in May, and the air most often feels dry.

Daylight stretches from about 10 h 42 min at the start of May to 9 h 54 min by month's end. Set against the rest of the year, May is Blue Mountains's 4th-clearest and 7th-windiest month. For the whole year in context, see Blue Mountains's year-round climate.

Daytime high: 15°; 9th warmest
Overnight low: 6°; 5th coldest
Precipitation: 48 mm; 6.6 wet days
Daylight: 10 h 18 min; 7:47 AM – 6:03 PM
Cloud cover: 49%; 4th clearest
Wind: 9 km/h; 7th windiest
Solar energy: 2.96 kWh/m²
Travel score: 5.3; out of 10

← April Blue Mountains year-round climate June →Best places to visit in May

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 17°C in the first days to 14°C by the end.

A typical May day in Blue Mountains reaches about 15°C in the afternoon and slips back to 6°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 19°C. Set against its neighbours, May runs about 4°C cooler than April and about 3°C warmer than June.

	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)	17	17	17	17	17	17	16	16	16	16	16	16	16	16	16	15	15	15	15	15	15	15	15	15	14	14	14	14	14	14	14
Avg low (°C)	7	7	7	7	6	6	6	6	6	6	6	6	6	6	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5

	Avg high (°C)	Avg low (°C)
1	17	7
2	17	7
3	17	7
4	17	7
5	17	6
6	17	6
7	16	6
8	16	6
9	16	6
10	16	6
11	16	6
12	16	6
13	16	6
14	16	6
15	16	5
16	15	5
17	15	5
18	15	5
19	15	5
20	15	5
21	15	5
22	15	5
23	15	5
24	15	5
25	14	5
26	14	5
27	14	5
28	14	5
29	14	5
30	14	5
31	14	5

How May really feels in Blue Mountains

Once humidity and wind are folded in, May averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Blue Mountains weather by month

How May compares with the rest of the year at a glance. May is the 9th-warmest and 10th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	25° / 14°	126	15.6	14	6.0
Feb	24° / 14°	146	15.4	13.3	5.9
Mar	22° / 12°	115	15.2	12.3	6.0
Apr	19° / 8°	56	9.1	11.2	6.3
May	15° / 6°	48	6.6	10.3	5.3
Jun	13° / 4°	62	7.5	9.8	3.7
Jul	12° / 3°	37	6.3	10	3.6
Aug	14° / 3°	46	6.7	10.7	4.4
Sep	17° / 5°	53	8.2	11.8	5.8
Oct	20° / 8°	75	10.5	12.8	6.3
Nov	22° / 10°	109	13.7	13.7	6.1
Dec	24° / 12°	121	13.4	14.2	6.4

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 16% of May, with mostly cloudy or overcast conditions the remaining 41%.

	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 (%)	58	58	59	59	59	60	61	61	62	62	62	62	61	61	61	61	60	60	59	59	59	59	58	57	57	56	56	56	55	55	56
Cloudier (%)	42	42	41	41	41	40	39	39	38	38	38	38	39	39	39	39	40	40	41	41	41	41	42	43	43	44	44	44	45	45	44

	Clearer (%)	Cloudier (%)
1	58	42
2	58	42
3	59	41
4	59	41
5	59	41
6	60	40
7	61	39
8	61	39
9	62	38
10	62	38
11	62	38
12	62	38
13	61	39
14	61	39
15	61	39
16	61	39
17	60	40
18	60	40
19	59	41
20	59	41
21	59	41
22	59	41
23	58	42
24	57	43
25	57	43
26	56	44
27	56	44
28	56	44
29	55	45
30	55	45
31	56	44

Chance of precipitation in May

Any precipitation

Blue Mountains gets around 48 mm of rain and snow over 6.6 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 22% and peaks near 26% on the wettest days, and about 0 day brings snow.

	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 (%)	26	25	25	24	24	23	22	22	21	21	20	20	20	20	20	21	21	21	21	22	22	22	22	22	22	22	23	23	23	23	23

	Rain chance (%)
1	26
2	25
3	25
4	24
5	24
6	23
7	22
8	22
9	21
10	21
11	20
12	20
13	20
14	20
15	20
16	21
17	21
18	21
19	21
20	22
21	22
22	22
23	22
24	22
25	22
26	22
27	23
28	23
29	23
30	23
31	23

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

Most of May feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, May lands in the dry band about 99% 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 (%)	96	96	96	96	97	97	97	97	98	98	98	99	99	99	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100
Comfortable (%)	4	4	4	4	3	3	3	3	2	2	2	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

	Dry (%)	Comfortable (%)
1	96	4
2	96	4
3	96	4
4	96	4
5	97	3
6	97	3
7	97	3
8	97	3
9	98	2
10	98	2
11	98	2
12	99	1
13	99	1
14	99	1
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

Wind in May

Winds average 9 km/h in May.

Across May, daily wind ranges from about 8 km/h on the calmest days to 9 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)	8	8	8	8	8	8	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	8	calm
2	8	calm
3	8	calm
4	8	calm
5	8	calm
6	8	calm
7	9	calm
8	9	calm
9	9	calm
10	9	calm
11	9	calm
12	9	calm
13	9	calm
14	9	calm
15	9	calm
16	9	calm
17	9	calm
18	9	calm
19	9	calm
20	9	calm
21	9	calm
22	9	calm
23	9	calm
24	9	calm
25	9	calm
26	9	calm
27	9	calm
28	9	calm
29	9	calm
30	9	calm
31	9	calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 10 h 42 min at the start of May to 9 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 48 minutes over May. Sunrise moves from 7:36 AM to 7:58 AM, and sunset from 6:16 PM to 5:54 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)	10.7	10.6	10.6	10.6	10.6	10.5	10.5	10.5	10.4	10.4	10.4	10.4	10.3	10.3	10.3	10.3	10.2	10.2	10.2	10.2	10.1	10.1	10.1	10.1	10.1	10.0	10.0	10.0	10.0	10.0	9.9
Sunrise (AM)	7:36	7:36	7:37	7:38	7:39	7:40	7:40	7:41	7:42	7:43	7:43	7:44	7:45	7:46	7:46	7:47	7:48	7:49	7:49	7:50	7:51	7:52	7:52	7:53	7:54	7:54	7:55	7:56	7:56	7:57	7:58
Sunset (PM)	6:16	6:15	6:14	6:13	6:12	6:11	6:10	6:09	6:08	6:07	6:07	6:06	6:05	6:04	6:03	6:03	6:02	6:01	6:01	6:00	5:59	5:59	5:58	5:58	5:57	5:57	5:56	5:56	5:55	5:55	5:54

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	10.7	7:36	6:16
2	10.6	7:36	6:15
3	10.6	7:37	6:14
4	10.6	7:38	6:13
5	10.6	7:39	6:12
6	10.5	7:40	6:11
7	10.5	7:40	6:10
8	10.5	7:41	6:09
9	10.4	7:42	6:08
10	10.4	7:43	6:07
11	10.4	7:43	6:07
12	10.4	7:44	6:06
13	10.3	7:45	6:05
14	10.3	7:46	6:04
15	10.3	7:46	6:03
16	10.3	7:47	6:03
17	10.2	7:48	6:02
18	10.2	7:49	6:01
19	10.2	7:49	6:01
20	10.2	7:50	6:00
21	10.1	7:51	5:59
22	10.1	7:52	5:59
23	10.1	7:52	5:58
24	10.1	7:53	5:58
25	10.1	7:54	5:57
26	10.0	7:54	5:57
27	10.0	7:55	5:56
28	10.0	7:56	5:56
29	10.0	7:56	5:55
30	10.0	7:57	5:55
31	9.9	7:58	5:54

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 2.96 kWh/m².

For context, solar energy here swings from a low near 2.4 kWh/m² to a high of 6.58 kWh/m² in December across the year — May's 2.96 kWh/m² sits near the bottom.

	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)	3.3	3.3	3.3	3.3	3.2	3.2	3.2	3.2	3.1	3.1	3.1	3.1	3.0	3.0	3.0	3.0	2.9	2.9	2.9	2.8	2.8	2.8	2.8	2.7	2.7	2.7	2.7	2.6	2.6	2.6	2.6
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	3.3	Moderate
2	3.3	Moderate
3	3.3	Moderate
4	3.3	Moderate
5	3.2	Moderate
6	3.2	Moderate
7	3.2	Moderate
8	3.2	Moderate
9	3.1	Moderate
10	3.1	Moderate
11	3.1	Moderate
12	3.1	Moderate
13	3.0	Moderate
14	3.0	Moderate
15	3.0	Moderate
16	3.0	Moderate
17	2.9	Moderate
18	2.9	Moderate
19	2.9	Moderate
20	2.8	Moderate
21	2.8	Moderate
22	2.8	Moderate
23	2.8	Moderate
24	2.7	Moderate
25	2.7	Moderate
26	2.7	Moderate
27	2.7	Moderate
28	2.6	Moderate
29	2.6	Moderate
30	2.6	Moderate
31	2.6	Moderate

Planning a trip in May

Hazard calendar for Blue Mountains

In seasonPeak

None of Blue Mountains's seasonal hazards are active in May. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Blue Mountains's rainy season runs October–March, when most of the year's rain falls.

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is May a good time to visit Blue Mountains?

Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

5.3

Sightseeing

9th-best month of the year

0.5

Beach & pool

9th-best month of the year

May is a reasonable time to visit Blue Mountains for sightseeing.

What to pack for Blue Mountains in May

From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In May, Blue Mountains sees daytime highs around 15°C and nights near 6°C. Worth packing: a warm layer. About 7 days see rain.

a warm layer

UV index in Blue Mountains in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Blue Mountains peaks around January 18 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 18 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	13	12	9	6	4	2	3	4	6	9	10	12
Level	Extreme	Extreme	Very high	High	Moderate	Moderate	Moderate	Moderate	High	Very high	Extreme	Extreme

	UV index (midday)	Level
Jan	13	Extreme
Feb	12	Extreme
Mar	9	Very high
Apr	6	High
May	4	Moderate
Jun	2	Moderate
Jul	3	Moderate
Aug	4	Moderate
Sep	6	High
Oct	9	Very high
Nov	10	Extreme
Dec	12	Extreme

Air quality in Blue Mountains in May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May falls, not just the annual average.

Air quality in Blue Mountains is worst in December — around 49 µg/m³ PM2.5 (poor), about 12.5× the cleanest month (July, 4 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	11	5	6	9	14	8	4	5	6	7	21	49
Level	Good	Good	Good	Good	Moderate	Good	Good	Good	Good	Good	Moderate	Poor

	PM2.5 (µg/m³)	Level
Jan	11	Good
Feb	5	Good
Mar	6	Good
Apr	9	Good
May	14	Moderate
Jun	8	Good
Jul	4	Good
Aug	5	Good
Sep	6	Good
Oct	7	Good
Nov	21	Moderate
Dec	49	Poor

Location & terrain

Where is Blue Mountains?

Blue Mountains sits at 33.7°S, 150.3°E, 978 m above sea level, in Australia. The nearest listed city is Katoomba, 2.0 km away.

Topography around Blue Mountains

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Blue Mountains.

Within 3 km, the terrain around Blue Mountains has large variations in elevation — a maximum elevation change of 696 m around an average of 890 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,002 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,382 m.

The land around Blue Mountains is covered by trees (91%) within 3 km, trees (92%) within 16 km, and trees (73%) and grassland (21%) within 80 km.

3 km

696 m

trees 91%

16 km

1,002 m

trees 92%

80 km

1,382 m

trees 73%

treesgrasslandartificial surfaceswater

← April Blue Mountains year-round climate June →Best places to visit in May

May weather nearby: Katoomba 2.0 km · Glenmore Park 32 km · Cranebrook 35 km · St Clair 43 km · Mount Druitt 45 km · Quakers Hill 51 km · Blacktown 55 km · Glenwood 56 km

Australia travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type I; 230 V · 50 Hz
Prices: ≈ 90% of US; price level, 2025
GDP per capita: $65,130; 2025
Happiness: 6.9 / 10; World Happiness, 2025
Homicide rate: 0.9; per 100k, 2023
Road deaths: 4.9; 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 Blue Mountains (-33.7133°, 150.3306°, elevation 978 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. 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).

	Avg high (°C)	Avg low (°C)
1	17	7
2	17	7
3	17	7
4	17	7
5	17	6
6	17	6
7	16	6
8	16	6
9	16	6
10	16	6
11	16	6
12	16	6
13	16	6
14	16	6
15	16	5
16	15	5
17	15	5
18	15	5
19	15	5
20	15	5
21	15	5
22	15	5
23	15	5
24	15	5
25	14	5
26	14	5
27	14	5
28	14	5
29	14	5
30	14	5
31	14	5

	Clearer (%)	Cloudier (%)
1	58	42
2	58	42
3	59	41
4	59	41
5	59	41
6	60	40
7	61	39
8	61	39
9	62	38
10	62	38
11	62	38
12	62	38
13	61	39
14	61	39
15	61	39
16	61	39
17	60	40
18	60	40
19	59	41
20	59	41
21	59	41
22	59	41
23	58	42
24	57	43
25	57	43
26	56	44
27	56	44
28	56	44
29	55	45
30	55	45
31	56	44

	Rain chance (%)
1	26
2	25
3	25
4	24
5	24
6	23
7	22
8	22
9	21
10	21
11	20
12	20
13	20
14	20
15	20
16	21
17	21
18	21
19	21
20	22
21	22
22	22
23	22
24	22
25	22
26	22
27	23
28	23
29	23
30	23
31	23

	Dry (%)	Comfortable (%)
1	96	4
2	96	4
3	96	4
4	96	4
5	97	3
6	97	3
7	97	3
8	97	3
9	98	2
10	98	2
11	98	2
12	99	1
13	99	1
14	99	1
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

	Avg high (°C)	Avg low (°C)
1	17	7
2	17	7
3	17	7
4	17	7
5	17	6
6	17	6
7	16	6
8	16	6
9	16	6
10	16	6
11	16	6
12	16	6
13	16	6
14	16	6
15	16	5
16	15	5
17	15	5
18	15	5
19	15	5
20	15	5
21	15	5
22	15	5
23	15	5
24	15	5
25	14	5
26	14	5
27	14	5
28	14	5
29	14	5
30	14	5
31	14	5

	Clearer (%)	Cloudier (%)
1	58	42
2	58	42
3	59	41
4	59	41
5	59	41
6	60	40
7	61	39
8	61	39
9	62	38
10	62	38
11	62	38
12	62	38
13	61	39
14	61	39
15	61	39
16	61	39
17	60	40
18	60	40
19	59	41
20	59	41
21	59	41
22	59	41
23	58	42
24	57	43
25	57	43
26	56	44
27	56	44
28	56	44
29	55	45
30	55	45
31	56	44

	Rain chance (%)
1	26
2	25
3	25
4	24
5	24
6	23
7	22
8	22
9	21
10	21
11	20
12	20
13	20
14	20
15	20
16	21
17	21
18	21
19	21
20	22
21	22
22	22
23	22
24	22
25	22
26	22
27	23
28	23
29	23
30	23
31	23

	Dry (%)	Comfortable (%)
1	96	4
2	96	4
3	96	4
4	96	4
5	97	3
6	97	3
7	97	3
8	97	3
9	98	2
10	98	2
11	98	2
12	99	1
13	99	1
14	99	1
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

	Avg high (°C)	Avg low (°C)
1	17	7
2	17	7
3	17	7
4	17	7
5	17	6
6	17	6
7	16	6
8	16	6
9	16	6
10	16	6
11	16	6
12	16	6
13	16	6
14	16	6
15	16	5
16	15	5
17	15	5
18	15	5
19	15	5
20	15	5
21	15	5
22	15	5
23	15	5
24	15	5
25	14	5
26	14	5
27	14	5
28	14	5
29	14	5
30	14	5
31	14	5

	Clearer (%)	Cloudier (%)
1	58	42
2	58	42
3	59	41
4	59	41
5	59	41
6	60	40
7	61	39
8	61	39
9	62	38
10	62	38
11	62	38
12	62	38
13	61	39
14	61	39
15	61	39
16	61	39
17	60	40
18	60	40
19	59	41
20	59	41
21	59	41
22	59	41
23	58	42
24	57	43
25	57	43
26	56	44
27	56	44
28	56	44
29	55	45
30	55	45
31	56	44

	Rain chance (%)
1	26
2	25
3	25
4	24
5	24
6	23
7	22
8	22
9	21
10	21
11	20
12	20
13	20
14	20
15	20
16	21
17	21
18	21
19	21
20	22
21	22
22	22
23	22
24	22
25	22
26	22
27	23
28	23
29	23
30	23
31	23

	Dry (%)	Comfortable (%)
1	96	4
2	96	4
3	96	4
4	96	4
5	97	3
6	97	3
7	97	3
8	97	3
9	98	2
10	98	2
11	98	2
12	99	1
13	99	1
14	99	1
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0