worldweather

Weather in Tonga - today, tomorrow and 14-day forecast

Right now temperatures across Tonga range from 21° to 21°. Below: today's conditions city by city, a live weather map, the 14-day outlook and month-by-month climate to help you pick the best time to travel.

Country values are the median of forecasts from 1 cities; the range shows local differences. Methodology.

Next days in Tonga

today🌧️ 21°💧 9.5 mm
Sun🌧️ 20°💧 24.8 mm
Mon☀️ 21°💧 0.3 mm
Tue☁️ 22°💧 0.2 mm
Wed🌧️ 22°💧 0.1 mm
Thu🌧️ 24°💧 1 mm
Fri🌧️ 22°💧 0.3 mm
Sat☁️ 21°💧 0.4 mm
Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Saturday 5 Sept in Tonga, the forecast high is 20°C. Typical daytime temperatures at this time of year range from 22°C to 24°C, so it will be exceptionally cool. It is cooler than 100% of similar days.

21°Cexceptionally cool
usually 22°C–24°C
cooler than 97% of similar days
night: cooler than usual rain: exceptionally wet wind: typical
20°Cexceptionally cool
usually 22°C–24°C
cooler than 100% of similar days
night: cooler than usual rain: exceptionally wet wind: stronger than usual
21°Cexceptionally cool
usually 22°C–24°C
cooler than 92% of similar days
night: near normal rain: typical rainfall wind: typical
22°Ccooler than usual
usually 22°C–24°C
cooler than 86% of similar days
night: near normal rain: typical rainfall wind: typical
22°Ccooler than usual
usually 22°C–24°C
cooler than 73% of similar days
night: near normal rain: less rain than usual wind: typical
24°Cnear normal
usually 22°C–24°C
night: warmer than usual rain: typical rainfall wind: typical
22°Ccooler than usual
usually 22°C–24°C
cooler than 81% of similar days
night: near normal rain: typical rainfall wind: lighter than usual

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →
15°23°30° 1981: 21°C1982: 21°C1983: 22°C1984: 22°C1985: 22°C1986: 21°C1987: 21°C1988: 23°C1989: 23°C1990: 23°C1991: 22°C1992: 24°C1993: 21°C1994: 21°C1995: 23°C1996: 24°C1997: 23°C1998: 22°C1999: 23°C2000: 23°C2001: 24°C2002: 23°C2003: 22°C2004: 23°C2005: 23°C2006: 24°C2007: 24°C2008: 24°C2009: 22°C2010: 24°C2011: 24°C2012: 23°C2013: 23°C2014: 23°C2015: 22°C2016: 23°C2017: 23°C2018: 23°C2019: 24°C2020: 24°C2021: 24°C2022: 25°C2023: 23°C2024: 23°C2025: 23°C 2026 forecast: 22°C current forecast 22°C 198119902000201020202026
cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 4-10 Sept period averaged 23°C by day. The coolest year was 1982 (21°C) and the warmest was 2022 (25°C). The current forecast averages 22°C - lower than in 82% of historical years.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

14-day forecast - Tonga

Tonga - 14-day weather forecast infographic

Tonga 30 & 45-day weather - long-range outlook

Next 17 days · forecast
21°
around 21° at night · days with rain: 4
Weeks 3-4 · avg for September
25°
around 19° at night · rain chance 41%
Weeks 5-7 · avg for October
26°
around 20° at night · rain chance 40%
The 30 & 45-day outlook for Tonga: the next 17 days are a numerical forecast updated daily - on average 21° by day and 21° at night. Further out we rely on multi-year climate averages: around 25° in September, and about 26° in October. Forecasts beyond two weeks are indicative only.

Day-by-day forecast for Tonga

Saturday5 September 2026
🌧️21°moderate rain
night 21° · evening 21° · rain 9.52 mm · humidity 90% · wind 9 m/s · clouds 100%
Sunday6 September 2026
🌧️20°moderate rain
night 20° · evening 20° · rain 24.76 mm · humidity 81% · wind 9 m/s · clouds 100%
Monday7 September 2026
☀️21°clear sky
night 21° · evening 21° · rain 0.28 mm · humidity 77% · wind 9 m/s · clouds 7%
Tuesday8 September 2026
☁️22°overcast clouds
night 22° · evening 22° · rain 0.23 mm · humidity 76% · wind 9 m/s · clouds 95%
Wednesday9 September 2026
🌧️22°light rain
night 22° · evening 22° · rain 0.11 mm · humidity 87% · wind 7 m/s · clouds 44%
Thursday10 September 2026
🌧️24°light rain
night 24° · evening 24° · rain 0.97 mm · humidity 75% · wind 7 m/s · clouds 88%
Friday11 September 2026
🌧️22°light rain
night 22° · evening 22° · rain 0.31 mm · humidity 89% · wind 5 m/s · clouds 16%
Saturday12 September 2026
☁️21°broken clouds
night 21° · evening 21° · rain 0.38 mm · humidity 67% · wind 7 m/s · clouds 73%
Sunday13 September 2026
🌧️21°light rain
night 21° · evening 21° · rain 0.31 mm · humidity 66% · wind 7 m/s · clouds 90%
Monday14 September 2026
☁️20°overcast clouds
night 20° · evening 20° · rain 0.29 mm · humidity 66% · wind 6 m/s · clouds 90%
Tuesday15 September 2026
🌧️21°light rain
night 21° · evening 21° · rain 0.45 mm · humidity 67% · wind 6 m/s · clouds 100%
Wednesday16 September 2026
🌧️21°light rain
night 21° · evening 21° · rain 0.46 mm · humidity 64% · wind 7 m/s · clouds 99%
Thursday17 September 2026
🌧️21°light rain
night 21° · evening 21° · rain 0.1 mm · humidity 66% · wind 8 m/s · clouds 29%
Friday18 September 2026
🌧️21°light rain
night 21° · evening 21° · rain 0.88 mm · humidity 77% · wind 9 m/s · clouds 65%
Saturday19 September 2026
🌧️21°light rain
night 21° · evening 21° · rain 0.82 mm · humidity 74% · wind 9 m/s · clouds 99%
Sunday20 September 2026
🌧️22°light rain
night 22° · evening 22° · rain 4.98 mm · humidity 85% · wind 12 m/s · clouds 100%
Monday21 September 2026
🌧️21°light rain
night 21° · evening 21° · rain 6.37 mm · humidity 82% · wind 13 m/s · clouds 100%

Sea temperature - Tonga

Water today
24°C
Week avg
24°C
Waves today
1.8 m
How's the water?
pleasant
16-day sea temperature forecast:
5.09 24°C6.09 24°C7.09 24°C8.09 24°C9.09 24°C10.09 24°C11.09 24°C12.09 24°C13.09 24°C
Average sea temperature through the year:
Jan 29°CFeb 29°CMar 29°CApr 28°CMay 27°CJun 26°CJul 25°CAug 25°CSep 25°COct 25°CNov 27°CDec 28°C
BeachWater todayWater week avgWavesHow's the water?
Nukuʻalofa23℃23℃1.6 mpleasant
Sea-surface temperature from marine models, updated daily. See also: where the sea is warmest right now.

Tonga weather through the year

Tonga - annual climate

Tonga weather month by month - when is the best time to go?

January (30°)February (30°)March (29°)April (28°)May (27°)June (26°)July (25°)August (24°)September (25°)October (26°)November (28°)December (28°)

Weather in other countries in Oceania

TuvaluTokelauVanuatuSolomon IslandsWallis and FutunaSamoa

FAQ - Tonga weather

What is the weather like in Tonga today?
Today it is about 21° during the day and 21° at night, moderate rain.
How far ahead can I check the forecast for Tonga?
This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.