Live Rain Radar for Nakhon Sawan
Track rain and storms across Nakhon Sawan and the upper Chao Phraya basin. Updated every 5 minutes.
Local Weather Context
Nakhon Sawan sits at the confluence of the Ping, Wang, Yom, and Nan rivers — the birthplace of the Chao Phraya, Thailand's most important waterway. This strategic location means rainfall here directly affects water levels downstream to Bangkok. The city is a critical flood monitoring point for the entire Central Plains.
Seasons
Wet season (May–October)
Monsoon rainfall combines with runoff from four major rivers. September–October are critical flooding months — the 2011 floods that devastated Bangkok originated in this watershed. Monthly rainfall averages 200–250 mm during peak months.
Transition months (November, April)
November sees river levels slowly receding. April brings dry heat exceeding 40°C, with occasional pre-monsoon storms providing brief relief.
Dry season (December–March)
Rainfall drops below 15 mm per month. Water management in Bhumibol and Sirikit dams becomes critical as reservoir levels determine dry-season water allocation for agriculture and cities downstream.
NEW! Tap Anywhere to Inspect
2 Feb 2026One tap, and the rain at that precise spot tells its own story—showing intensity, precipitation type, cloud and air temperatures, and live national alerts, while making even the smallest rain pockets easy to identify and compare.
Who Needs Rain Radar Here
Water management authorities
The Royal Irrigation Department monitors rainfall in the Nakhon Sawan watershed to coordinate dam releases and flood prevention for the entire Chao Phraya basin.
Rice farmers
The surrounding plains are among Thailand's most productive rice-growing areas. Farmers time planting and harvesting around monsoon patterns tracked via radar.
Freshwater fishing community
Bung Boraphet, Thailand's largest freshwater lake, supports a significant fishing industry. Storm tracking helps fishermen on the lake stay safe.
Transport and logistics
Nakhon Sawan is a major highway junction connecting northern and central Thailand. Flood monitoring along Highway 1 and Highway 117 is essential during monsoon season.
Radar Coverage
RainViewer covers the full Nakhon Sawan province and surrounding river basins. Coverage extends north towards Phitsanulok, east to Phetchabun, and south along the Chao Phraya towards Chai Nat and Singburi. The relatively flat terrain provides excellent radar propagation.
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FAQ
Why is Nakhon Sawan's rainfall important for Bangkok?
The four major rivers converge here to form the Chao Phraya. Heavy rainfall in this watershed flows downstream to Bangkok within days, making upstream radar monitoring critical for flood prediction.
Can radar help predict flooding in Nakhon Sawan?
Yes. Sustained heavy rainfall visible on radar over the Ping, Wang, Yom, and Nan river basins north of Nakhon Sawan indicates rising water levels at the confluence, typically 12–24 hours later.
How does radar help rice farmers here?
Farmers watch radar to protect drying rice from unexpected rain and to time irrigation when natural rainfall falls short during dry spells within the monsoon season.
See rain in Nakhon Sawan before it reaches your fields or your route
Nakhon Sawan's rain feeds the whole Chao Phraya system, but what matters locally is the next two hours — not the season. The map updates every 5 minutes — often 2–5 minutes faster than other apps — so by the time a cell is building over the Ping valley upstream, you've already seen it heading toward the confluence.
Rain Viewer Essential gives you:
- A 2-hour rain forecast in 5-minute slices — not hourly blocks, so you can see the exact window when the afternoon storm passes and the harvest crew can finish the field
- Rain alerts that trigger before rain arrives — set your rice fields, fish ponds at Bueng Boraphet, or Highway 1 departure point and get notified while you can still change your plans
- Direction arrows on the map — so even when the animation is unclear, you can see whether the upstream cell is tracking toward the confluence or pushing east toward Phichit
- 48 hours of radar history — see how yesterday's September storm moved through the Ping and Wang catchments and recognise the same pattern forming today
- Multiple locations — track rain at your fields, the Bueng Boraphet shoreline, and the Highway 1 floodplain section at the same time
A 7-day forecast tells you October will be wet. Rain Viewer tells you whether the afternoon is clear enough to send in the cutting crew or hold until tomorrow.
Track rain in Nakhon Sawan — free
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