Henderson weather in January

In January, Henderson sees average daytime highs of 21°C and overnight lows near 18°C, with 71 mm of rain across 8.7 wet days and about 14.2 hours of daylight. It is the 2nd-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 21°C through the month. The sky is clear or mostly clear about 25% of the time in January, and the air most often feels comfortable.

Daylight stretches from about 14 h 30 min at the start of January to 13 h 54 min by month's end. Set against the rest of the year, January is Henderson's 8th-clearest and 9th-windiest month. For the whole year in context, see Henderson's year-round climate.

Daytime high
21°
2nd warmest
Overnight low
18°
11th coldest
Rainfall
71 mm
8.7 wet days
Daylight
14 h 18 min
6:23 AM – 8:39 PM
Cloud cover
60%
8th clearest
Wind
18 km/h
9th windiest
Solar energy
7.25 kWh/m²
Travel score
6.6
out of 10

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 21°C through the month.

A typical January day in Henderson reaches about 21°C in the afternoon and slips back to 18°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 23°C. Set against its neighbours, January runs about 2°C warmer than December and about 1°C cooler than February.

15°18°20°23°25°151015202531
Avg high (°C)Avg low (°C)
12017
22017
32017
42017
52017
62017
72017
82017
92017
102018
112018
122018
132118
142118
152118
162118
172118
182118
192118
202118
212118
222118
232118
242118
252118
262118
272118
282118
292118
302118
312118

Henderson weather by month

How January compares with the rest of the year at a glance. January is the 2nd-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan21° / 18°718.714.26.6
Feb21° / 18°617.813.46.7
Mar20° / 17°67812.36.7
Apr19° / 16°829.811.16.0
May17° / 14°10712.310.15.1
Jun15° / 12°11612.79.54.1
Jul14° / 11°128159.73.6
Aug14° / 11°11515.210.63.6
Sep14° / 12°10213.411.74.0
Oct16° / 13°8411.9134.6
Nov17° / 14°7611.1145.2
Dec19° / 16°9110.914.55.9

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 21% of January, with mostly cloudy or overcast conditions the remaining 54%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14456
24555
34555
44555
54654
64654
74555
84555
94654
104654
114654
124654
134654
144654
154753
164753
174753
184753
194753
204753
214654
224753
234753
244654
254654
264654
274555
284555
294555
304654
314654

Chance of precipitation in January

Any precipitation

Henderson gets around 71 mm of rain over 8.7 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 29% and peaks near 31% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
130
229
329
429
529
629
729
829
930
1030
1130
1230
1330
1431
1531
1631
1730
1830
1930
2029
2129
2228
2327
2427
2526
2626
2726
2825
2925
3025
3125

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the comfortable band about 37% of days. Sticky, muggy-or-worse air turns up on roughly 9% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
13035314
23035314
32935324
42835334
52736334
62636344
72536345
82437355
92337355
102238355
112138355
122039365
131939366
141939366
151839366
161739367
171739367
181639368
191639369
2016383610
2116383610
2216373611
2316373512
2415363513
2515353514
2615353515
2715353515
2815343516
2915343416
3015343416
3115353416

Wind in January

Winds average 18 km/h in January.

Across January, daily wind ranges from about 18 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
119light breeze
219light breeze
319light breeze
419light breeze
519light breeze
619light breeze
719light breeze
819light breeze
919light breeze
1019light breeze
1119light breeze
1219light breeze
1319light breeze
1419light breeze
1519light breeze
1619light breeze
1719light breeze
1819light breeze
1919light breeze
2019light breeze
2119light breeze
2219light breeze
2319light breeze
2419light breeze
2518light breeze
2618light breeze
2718light breeze
2818light breeze
2918light breeze
3018light breeze
3118light breeze

Sunrise & sunset in January

DaylightNight

Daylight runs from about 14 h 30 min at the start of January to 13 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 36 minutes over January. Sunrise moves from 6:10 AM to 6:38 AM, and sunset from 8:39 PM to 8:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.56:108:39
214.56:118:39
314.56:128:40
414.56:128:40
514.46:138:40
614.46:148:40
714.46:158:40
814.46:168:40
914.46:168:40
1014.46:178:40
1114.46:188:40
1214.36:198:40
1314.36:208:39
1414.36:218:39
1514.36:228:39
1614.36:238:39
1714.26:248:39
1814.26:258:38
1914.26:268:38
2014.26:278:38
2114.26:288:37
2214.16:298:37
2314.16:308:36
2414.16:318:36
2514.16:328:35
2614.06:338:35
2714.06:348:34
2814.06:358:34
2914.06:368:33
3013.96:378:32
3113.96:388:32

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 7.25 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 1.97 kWh/m² to a high of 7.25 kWh/m² in January across the year — January's 7.25 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.5Intense
27.5Intense
37.5Intense
47.5Intense
57.5Intense
67.4Intense
77.4Intense
87.3Intense
97.3Intense
107.2Intense
117.2Intense
127.1Intense
137.1Intense
147.0Intense
157.0Intense
167.0Intense
176.9Intense
186.9Intense
196.9Intense
206.9Intense
216.8Intense
226.8Intense
236.8Intense
246.8Intense
256.8Intense
266.7Intense
276.7Intense
286.7Intense
296.6Intense
306.6Intense
316.6Intense
Planning a trip in January

Hazard calendar for Henderson

In seasonPeak

In January, Henderson sits inside its cyclone season. The full year is below, with each hazard's peak months called out.

Henderson 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 January a good time to visit Henderson?

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

6.6
Sightseeing
3rd-best month of the year
3.8
Beach & pool
2nd-best month of the year

January is a reasonable time to visit Henderson for sightseeing.

What to pack for Henderson in January

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

In January, Henderson sees daytime highs around 21°C and nights near 18°C. Pack sun protection. Worth having: rain gear. About 9 days see rain.

sun protectionrain gear

Sea temperature near Henderson in January

The nearest coast averages about 20°C in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 22 km away) is warmest in February at about 21°C and coldest in August near 14°C.

It's comfortable for a long swim from Jan 18 to Mar 15 — about 1.9 months when the water holds above 20°C.

15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingcomfortable to swim
Sea temperature (°C)Comfort
Jan20Refreshing
Feb21Refreshing
Mar20Refreshing
Apr19Cool
May17Cool
Jun16Cool
Jul15Bracing
Aug14Bracing
Sep14Bracing
Oct15Cool
Nov17Cool
Dec19Cool

UV index in Henderson in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Henderson peaks around January 12 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 17 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highHighModerateHighVery highExtremeJan 12UV 12Jun 17UV 2
UV index (midday)Level
Jan12Extreme
Feb11Extreme
Mar8Very high
Apr5High
May3Moderate
Jun2Low
Jul3Moderate
Aug4Moderate
Sep5Moderate
Oct8Very high
Nov11Extreme
Dec12Extreme
Location & terrain

Where is Henderson?

Henderson sits at 36.9°S, 174.6°E, 13 m above sea level, in New Zealand. The nearest listed city is Lincoln, 2.0 km away.

Topography around Henderson

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

Within 3 km, the terrain around Henderson has only modest variations in elevation — a maximum elevation change of 107 m around an average of 36 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 465 m; within 80 km, large variations in elevation — a maximum elevation change of 905 m.

The land around Henderson is covered by artificial surfaces (47%) and trees (37%) within 3 km, trees (47%) and water (21%) within 16 km, and water (57%) and grassland (23%) within 80 km.

3 km
107 m
16 km
465 m
80 km
905 m
treesgrasslandcroplandartificial surfaceswatermangroves
January weather nearby: Lincoln 2.0 km · Te Atatu South 3.0 km · Massey 5.0 km · Te Atatu Peninsula 5.0 km · Massey East 6.0 km · New Lynn 7.0 km · Titirangi 7.0 km · Avondale 7.0 km

New Zealand travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type I
230 V · 50 Hz
Prices
≈ 86% of US
price level, 2025
GDP per capita
$49,591
2025
Happiness
7.0 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.5
per 100k, 2022
Road deaths
9.6
per 100k/yr, 2019
Income group
High
World Bank
Religion
no religion 49%Christian 37%objected to answering 7%Hindu 3%

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 Henderson (-36.8801°, 174.6198°, elevation 13 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).