Dee Why in Spring

In spring (September, October and November), Dee Why sees average daytime highs around 20°C and overnight lows near 15°C, with 181 mm of rain over about 24 wet days across the season. It is the 3rd-warmest season and the driest season of the year.

Over the season highs climb from about 18°C in early September to 22°C by late November. The sky is clear or mostly clear about 46% of the time across spring, and the air most often feels dry.

Spring is Dee Why's 2nd-best season to visit on our travel score. For the whole year in context, see Dee Why's year-round climate.

Avg daytime high: 20°C; 3rd-warmest season
Avg overnight low: 15°C
Rainfall: 181 mm; 24 wet days
Avg wind: 18 km/h
Travel score: 6.8; 2nd-best season
Months: Sep · Oct · Nov

← Winter Dee Why year-round climate Summer →

Spring Summer Fall Winter

Temperature in Dee Why in Spring

Average highAverage lowShaded bands: 10–90% of days

Over the season highs climb from about 18°C in early September to 22°C by late November.

A typical spring day in Dee Why reaches about 20°C and drops to 15°C overnight. The warmest of the three months is November, the coolest September.

Dee Why weather by month

How the three spring months (September, October and November) compare with the rest of the year — the season's months are highlighted.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	24° / 20°	72	9.3	14	7.2
Feb	24° / 20°	93	10.3	13.3	6.9
Mar	23° / 19°	82	11.6	12.3	6.8
Apr	21° / 17°	77	10.5	11.2	6.7
May	19° / 14°	79	9.7	10.3	6.4
Jun	17° / 12°	97	10.3	9.8	5.6
Jul	16° / 11°	56	7.7	10	5.8
Aug	17° / 11°	53	6.6	10.7	6.4
Sep	19° / 13°	50	6.7	11.8	6.9
Oct	20° / 15°	59	8	12.8	6.8
Nov	21° / 17°	72	9.1	13.8	6.8
Dec	23° / 19°	60	8.6	14.2	7.2

Cloud cover in Spring

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 46% of the time across spring.

Chance of precipitation in Spring

Any precipitation

Dee Why gets around 181 mm of rain over 24 wet days across spring. The line is the day-by-day chance of measurable precipitation.

Humidity in Spring

DryComfortableHumidMuggyOppressiveMiserable

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

Wind in Spring

Winds average 18 km/h across spring.

Sunrise & sunset in Spring

DaylightNight

Daylight runs from about 11 h 18 min in early September to 14 h 06 min by late November. The lit band spans sunrise to sunset each day.

Solar energy in Spring

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day across spring, about 5.7 kWh/m².

Planning a trip in spring

Hazard calendar for Dee Why

In seasonPeak

In spring, Dee Why overlaps its cyclone season. The full year is below, with each hazard's peak months called out.

Dee Why sits in the South Indian Ocean cyclone belt; the season peaks January–March.

Cyclone

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is spring a good time to visit Dee Why?

Our two travel scores rate spring for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.

6.8

Sightseeing

2nd-best month of the year

3.7

Beach & pool

3rd-best month of the year

spring is a reasonable time to visit Dee Why for sightseeing.

What to pack for Dee Why in Spring

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

In spring, Dee Why sees daytime highs around 20°C and nights near 15°C. Pack sun protection. Worth having: rain gear. About 24 days see rain.

sun protectionrain gear

Sea temperature near Dee Why in Spring

The nearest coast averages about 19°C across spring — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 16 km away) is warmest in February at about 23°C and coldest in August near 18°C.

It's comfortable for a long swim from Nov 13 to Jun 7 — about 6.8 months when the water holds above 20°C.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	23	23	23	22	21	20	19	18	18	19	20	21
Comfort	Refreshing	Refreshing	Refreshing	Refreshing	Refreshing	Cool	Cool	Cool	Cool	Cool	Refreshing	Refreshing

	Sea temperature (°C)	Comfort
Jan	23	Refreshing
Feb	23	Refreshing
Mar	23	Refreshing
Apr	22	Refreshing
May	21	Refreshing
Jun	20	Cool
Jul	19	Cool
Aug	18	Cool
Sep	18	Cool
Oct	19	Cool
Nov	20	Refreshing
Dec	21	Refreshing

UV index in Dee Why in Spring

LowModerateHighVery highExtreme

Clear-sky midday UV across spring averages around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Dee Why peaks around January 16 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 19 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	12	11	9	6	4	2	3	4	6	8	10	12
Level	Extreme	Extreme	Very high	High	Moderate	Moderate	Moderate	Moderate	High	Very high	Very high	Extreme

	UV index (midday)	Level
Jan	12	Extreme
Feb	11	Extreme
Mar	9	Very high
Apr	6	High
May	4	Moderate
Jun	2	Moderate
Jul	3	Moderate
Aug	4	Moderate
Sep	6	High
Oct	8	Very high
Nov	10	Very high
Dec	12	Extreme

Location & terrain

Where is Dee Why?

Dee Why sits at 33.8°S, 151.3°E, 18 m above sea level, in Australia. The nearest listed city is Manly, 5.0 km away.

Topography around Dee Why

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

Within 3 km, the terrain around Dee Why has only modest variations in elevation — a maximum elevation change of 170 m around an average of 31 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 223 m; within 80 km, large variations in elevation — a maximum elevation change of 811 m.

The land around Dee Why is covered by artificial surfaces (34%), trees (30%) and water (28%) within 3 km, water (52%) and trees (36%) within 16 km, and trees (50%) and water (36%) within 80 km.

3 km

170 m

artificial surfaces 34%

16 km

223 m

water 52%

80 km

811 m

trees 50%

treesgrasslandartificial surfacesbare terrainwater

← Winter Dee Why year-round climate Summer →

Spring weather nearby: Manly 5.0 km · Pittwater 10 km · Mosman 11 km · Chatswood 11 km · Saint Ives 12 km · Sydney Central Business District 15 km · Sydney 15 km · Surry Hills 16 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 Dee Why (-33.7511°, 151.2889°, elevation 18 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.