Nonthaburi shares Bangkok's tropical climate -- cool & dry, hot, and rainy -- plus the same January-April burning-season haze. What genuinely sets it apart is the Chao Phraya River running through it: here's the month-by-month picture, with temperatures, rainfall, the best time to move, what to pack, and how the river shapes monsoon-season risk.
Nonthaburi sits directly against Bangkok's northwestern edge, part of the same metro area and the same tropical climate -- warm to hot every day of the year, with no real winter. The cool, dry season (November-February) is the most comfortable and the best time to move; the hot season (March-May) peaks in a sweltering April; and the rainy season (May-October) brings dramatic afternoon downpours and the year's lowest prices. Layered on top, a regional crop-burning haze pushes PM2.5 up from roughly January to April. The one genuine local difference from Bangkok is the Chao Phraya River running directly through the province: riverside zones carry real monsoon-season flood exposure that most of Bangkok proper doesn't share -- see the full Nonthaburi flood risk guide for the area-by-area breakdown. For live rent by neighbourhood, use the BAANLYY area scores and Nonthaburi hub.
Typical average daytime high, night-time low and monthly rainfall for Nonthaburi, which tracks the Bangkok metro-area climate closely. Figures are long-term guide averages -- any given year varies.
| Month | Avg high | Avg low | Rainfall | Season | What to expect |
|---|---|---|---|---|---|
| January | 33°C | 22°C | ~10 mm | Cool / dry | Peak season -- warm days, cooler nights, low rain. Haze can start to build inland. |
| February | 34°C | 24°C | ~20 mm | Cool → hot | Still dry and pleasant early on; heat and PM2.5 haze ramp up by month's end. |
| March | 35°C | 26°C | ~30 mm | Hot / hazy | Heat builds and burning-season smog is often at its worst across the wider metro region. |
| April | 36°C | 27°C | ~70 mm | Hot (peak) | The hottest, most humid month. Songkran (Thai New Year, ~13-15 Apr) brings water fights across the province. |
| May | 35°C | 26°C | ~190 mm | Rainy (start) | The southwest monsoon arrives; afternoon downpours break the heat but humidity stays high. |
| June | 34°C | 26°C | ~150 mm | Rainy | Short, heavy afternoon storms most days, then clear again. |
| July | 33°C | 25°C | ~160 mm | Rainy | Warm and wet with a brief mid-monsoon lull in some years. Canal levels start to build. |
| August | 33°C | 25°C | ~190 mm | Rainy | One of the wetter months; rain is frequent but rarely all-day. Flood-risk window begins. |
| September | 32°C | 25°C | ~320 mm | Rainy (peak) | The wettest month -- heaviest rainfall, and the start of Nonthaburi's highest flood-risk stretch along the Chao Phraya. |
| October | 32°C | 25°C | ~280 mm | Rainy (end) | Nonthaburi's peak flood-risk month, when accumulated monsoon rain and upstream reservoir releases have historically raised the Chao Phraya furthest. |
| November | 32°C | 23°C | ~50 mm | Cool (start) | Rain eases and river levels start to drop, though they stay elevated from September-October releases early in the month. |
| December | 31°C | 21°C | ~10 mm | Cool / dry | The most comfortable month: warm, dry, sunny days and the coolest nights of the year. |
Nonthaburi's best stretch and the easiest window to move, house-hunt and settle in. 'Cool' is relative -- daytime highs still sit around 31-34°C -- but humidity falls, rain is rare and nights can dip to a genuinely pleasant 21-24°C. It's also the province's lowest flood-risk period, so viewing riverside and MRT-corridor buildings alike is straightforward.
The thermometer climbs steadily, peaking in April with highs of 35-40°C and oppressive humidity. Air-conditioning becomes non-negotiable. Songkran, the Thai New Year water festival around 13-15 April, brings province-wide water fights. March and early April also coincide with the worst of the regional burning-season haze (see below).
The southwest monsoon brings Nonthaburi's rain -- most days deliver a heavy downpour for an hour or two, then clear up. This is also the window that matters most for Nonthaburi specifically: from roughly August through November, sustained rain and upstream reservoir releases raise the Chao Phraya, and riverside zones like Mueang Nonthaburi, Bang Kruai and the Pak Kret riverbank carry real flood exposure, peaking in October. See the full breakdown in BAANLYY's Nonthaburi flood risk guide, linked below.
As across the wider Bangkok metro area, the weather factor that surprises new arrivals most isn't heat or rain -- it's air quality. From roughly January to April, agricultural crop-residue burning across Thailand and neighbouring countries combines with still, dry, hot-season air to trap fine particulate matter (PM2.5) over Nonthaburi and Bangkok alike. On the worst days a grey haze settles over the province and the air-quality index tips into the unhealthy range, with February and March often the peak. It eases as the rains arrive and clear the air. Practical responses are simple: track a daily AQI app, run an air purifier at home, keep windows shut on bad days, and wear an N95/KN95 mask outdoors when readings spike.
Humidity in Nonthaburi is high year-round and highest in the rainy season, which is why air-conditioning and good airflow matter when choosing a condo. What genuinely sets Nonthaburi apart from most of Bangkok proper is the Chao Phraya River running directly through the province: riverside zones -- the old town of Mueang Nonthaburi, Bang Kruai, and the Pak Kret riverbank and Koh Kret -- carry real flood exposure through the August-November monsoon window, peaking in October, while MRT Purple and Pink line corridor neighbourhoods (Bang Yai, Ngamwongwan, Chaengwattana) sit on higher, better-drained ground. This isn't a repeat-every-year event at 2011 Great Flood scale, but it is a genuinely more significant consideration here than in most inland Bangkok districts. For the full area-by-area exposure map, the 2011 flood history, month-by-month risk and insurance guidance, see BAANLYY's dedicated Nonthaburi flood risk guide.
For comfort, November and December are the sweet spot: warm, dry, sunny and clear, before the haze builds -- and Nonthaburi's lowest flood-risk window, making it easy to view riverside as well as MRT-corridor buildings. For value, the rainy months of June to July bring lower prices and lush surroundings before flood risk builds toward its August-November peak. The windows to plan around are April (peak heat plus Songkran), the January-April haze, and -- specific to Nonthaburi -- October, the province's historical peak flood-risk month if you're considering a riverside address.
November to February -- the cool, dry season -- is the most comfortable time, with lower humidity, clear skies and very little rain. It is also Nonthaburi's lowest flood-risk window, making it the easiest time to view riverside and MRT-corridor buildings alike. If you want lower costs and don't mind daily afternoon storms, June to August offers real value, though flood risk begins building toward the end of that window.
Practically no -- Nonthaburi sits directly against Bangkok's northwestern edge and shares the same tropical climate: the same three seasons, similar temperatures and rainfall, and the same January-April haze window. The genuine local difference isn't temperature, it's flood exposure: Nonthaburi's riverside zones along the Chao Phraya carry real monsoon-season flood risk that inland Bangkok districts don't share to the same degree.
Nonthaburi is hot all year, tracking Bangkok closely. Daytime highs sit around 31-33°C even in the 'cool' season and climb to 35-40°C at the April peak, with high humidity making it feel hotter. Nights are mildest from December to January (lows of 21-23°C). Air-conditioning is standard in condos, malls, offices and MRT stations.
Yes, seasonally, in line with the wider Bangkok metro area. From roughly January to April, agricultural crop burning across the region combines with still, dry air to push PM2.5 levels into the unhealthy range on the worst days. Air quality improves once the rains arrive. Many residents track a daily air-quality index, run air purifiers indoors and wear N95 masks on bad days.
Yes -- Nonthaburi's flood risk is meaningfully higher than most of Bangkok proper because the Chao Phraya River runs directly through the province. Riverside zones (Mueang Nonthaburi's old town, Bang Kruai, the Pak Kret riverbank and Koh Kret) carry real exposure, peaking in the August-November monsoon window and especially October, while MRT Purple and Pink line corridor neighbourhoods (Bang Yai, Ngamwongwan, Chaengwattana) sit on higher, better-drained ground. See BAANLYY's dedicated Nonthaburi flood risk guide for the full area-by-area and month-by-month breakdown, including what happened in the 2011 Great Flood.
Lightweight, breathable clothing year-round; a compact umbrella or packable rain jacket for the May-October monsoon; quick-dry shoes for the riverside's occasional flooded footpaths; a light layer for air-conditioned interiors; strong sunscreen for the hot season; and an N95 mask for the worst burning-season haze days. Modest clothing that covers shoulders and knees is needed for temple visits.
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Match the season to your plans, then match your budget to the right Nonthaburi area and MRT-corridor condo.
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